comsol contact penalty factor

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Structural contact modeling is a highly non-linear problem. If you are solving a stationary (steady-state) model, you will want to ramp the prescribed displacements, loads, and stiffnesses of any spring foundations during the solution. I think all this is due to the penalty factor assignment. 2- I cannot find augmented lagrangian solver option in stationary page. Discussion Locked This discussion was locked by a forum moderator. Your internet explorer is in compatibility mode and may not be displaying the website correctly. Until now I didn't get any good results, all case I got convergence errors. Suggested Products Download the application files Contact problems with friction should always be solved incrementally using a parametric or time dependent solver since the development of friction forces is history dependent. By using Matlab a "perturbed" geometry is generated, by using a morphing mesh approach. Manual meshing will need to be used. Most contact models will require some changes to the default model settings to solve efficiently. Discussion Closed This discussion was created more than 6 months ago and has been closed. The default is 0.005. I am modeling a transient contact problem using the penalty method instead of the augmented Lagrangian method. If any one of them could work , then it would be sufficient to me. Guidance of manual tuning of the Penalty Factor is in Knowledge Base entry However, manual tuning of the Penalty Factor should only be done after all of the other recommendations in this Knowledgebase. COMSOL document says "A contact pair is a pair that define boundaries where the parts may come into contact but cannot penetrate each other under deformation for modeling of structural contact and multiphysics contact." But there is penetration. Setting contact pair, meshing and solver setting looks fine, but why convergence strat oscillation up to very high value or down low finally not converge with current setting up??? Then remove the contact pressure variable from the solve for list in the solver manager. I am using the weak constraint in the properties, does that affect my model? Only takes a few moments to solve. Veryst Engineering, Nagi, Introduce a new Global Parameter (name it, for example: RampFactor ) and multiply all loads, displacements, and stiffnesses by this factor. 4. define a parametric solver to fine-tune the load step (use a small parameter-step if the convergence does not appear). This will be easier to solve than the case of domains with only applied loads, forces, and Contact conditions, but that are otherwise unconstrained. Add a Contact feature within the Solid Mechanics interface. Would you please help me to find it? I dont know if this page dates back to v3.5A. Marjan. This setting is shown in the screenshot below. Modeling friction is will often increase the computation time significantly, so if you can reasonably ignore friction, do so. One thing of note, I had to add solid.hmin_dst as a parameter in the global definitions. Nagi Elabbasi Veryst Engineering Your internet explorer is in compatibility mode and may not be displaying the website correctly. I guess that this approach may be general. Many Thanks I am trying to get what exactly u meant by the order of the discritization and where I can change it. If you anticipate contact between any sharp corners and surfaces in the model, you should modify the geometry such that the sharp corner is replaced with a rounded boundary, a fillet. Thus, question are: is there a way to solve the contact problem without calculate the pressure field at the coontact interface? This is described very nicely in the Structural Mechanics User's Guide. For example, the screenshot below shows RampFactor starting at a value of 0.001 and then increasing from 0.1 to 1 in increments of 0.1. Hi Ryan, Pasquale, Pasquale: Friction usually only causes minor local effects, and friction coefficients are difficult to obtain with any accuracy, so this simplification is practically justified. The convective fluid flow. Why does it have . (PDF) VERIFICATION OF CONTACT MODELING WITH COMSOL - ResearchGate Contact Analysis of a Snap Hook Using a Penalty Formulation - COMSOL There adjust discritization to quadratic. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version Jay. My guess is that on contact, the stress changes . Classic car paint simulator - kuy.velocityrp.de the model with extra layers resemble the experimental test where the extra layers work as two jacks one to be a substrate to the sensor and the other push the tissue against the sensor. I am really sorry for the late replay. 'Penalty, Dynamic' is selected as the contact method. When I assigned a fixed expansion rate, I could get this contact problem to work without too much difficulties (had to tune the penalty factor several times). parameters, initial contact pressure and penalty factor, . The cylinder is passing through the slab because the applied cylinder displacement is too big for one step. To apply this assumption, add a Prescribed Displacement condition to the rigid domain. The magnitude of this spring constant is initially set at a very high value, high enough such that the deformations are negligible due to the initially applied loads. The COMSOL discussion forum covers a wide variety of simulation topics. Thank you, Concerning a contact pressure, I suggest that you take a look at cylinder roller example in the library. The default COMSOL expression in front of Pn has two components. Structural Mechanics and when I tried both of them the solution didn't wasn't converged after (0.35 N). I will test as soon this procedure on a 3D model and I will update you about results. Rather than modeling contact between a point and a plane, add a small fillet to the sharp corners here so that you get surface-to-surface contact, rather than the (singular) point-to-surface contact. How does COMSOL Multiphysics handle complex-valued numbers and problems in the frequency domain? I would rather rely on what is written in front of Pn but just multiply it by a constant like (1/3). If that doesnt provide any clues then try disabling contact and checking that the model otherwise works. As this spring constant is reduced to zero, the domain will gradually relax into its deformed state due to contact and applied loads. Note: This discussion is about an older version of the COMSOLMultiphysics software. This is a simplifying assumption which will make the problem easier to solve. I also would recommend that you attach your model. The contacting boundaries should be meshed finely enough to give good resolution of the contacting area. Using a penalty function for contact problem is good alternative of the augmented Lagrangian method available in the structural mechanics module. Test fit your tuner, import, track car with our new wheels by Ultra Wheel . the models are built in comsol 4.1 version. Any help will be appreciated. Using the parameter RampFactor that ranges linearly from 0 to 1, a spring foundation with spring constant kz in the Z-direction can be introduced where, kz = k0*(1-RampFactor)*2^(-RampFactor*10). You will then see that the higher k the lower the penetration between the two elastic material, but also the lower k the smoother the convergence there are several things that you should figure out (I am referring to the semplified model). I would start by examining the error message that COMSOL reports. You will then see that the higher k the lower the penetration between the two elastic material, but also the lower k the smoother the convergence Browse the threads and share your ideas with the COMSOL community. The iterative solver will require less memory, but convergence is usually much slower. For more information on this, see Knowledge Base entry 905. Marjan, [QUOTE] To start a new discussion with a link back to this one, click here. if you can, please attach your model so we can see better your settings. The higher the penalty factor the less the overlap between the surfaces (and hence more accurate solution) yet the more ill-conditioned the stiffness matrix will be. Thanks again Contact Analysis of a Snap Hook Using a Penalty Formulation - COMSOL The Contact Node Penalty Factor An important parameter in the settings for the Contact node is the penalty factor. I must avoid any solver-error during the automatic calculation. The default COMSOL expression in front of Pn has two components. I notice also that the slab is very thin, so ideally it should be defined as the destination not the source of the contact pair (since it is less stiff). It will be great if you can share your experience for this problem. For your application, I think you have to: 1. define contact pair2. Best regards When I choose the penalty factor as E/k (I know elastic modulus and I get average mesh size from statics), the result is so strange. All the best, The first part (solid.Eequ/solid.hmin_dst) is a geometry/material part of the same form as the E/k expression you mentioned that is automated to get good estimates for E and k. The material stiffness Solid.Eequ is automatically calculated based on the material of the destination surface, and the minimum element size solid.hmin_dst is automatically calculated also from the destination surface. where k is a stiffness constant in the order of the stiffness of the material. This article contains guidance for solving models that include structural contact, and the procedures that should be followed to achieve a converged solution. 2. assign the penalty normal pressure equal to E/h (where E is the estimated stiffness of your part and h is the mesh size). The ramping of spring constants used for spring foundations on unconstrained domains should begin at the peak value of spring stiffness and then down to zero. But I am wondering that did the contact normal penalty factor only affect the penalty method but not the augmented Lagrangian method. I had thought that h is the average mesh size but now I learned that it is min mesh size of slave.It was a very good explanation of what I see as pn. Marjan, Hi Again Ahmad, To use such a method in COMSOL you just need to replace the Contact normal penalty factor expression in the contact pair by the following expression : k/h Much of the technical discussions in this thread are now outdated. The destination boundary of the contact pair must be meshed finer than the source boundary, by at least a factor of two. par Bridget Paulus. Build & Customize Your Car With Ultra Wheel Car Builder! There are many reasons why contact problems do not converge. Structural Contact Modeling Guidelines - Knowledge Base Veryst Engineering. I have applied your procedure on a 2D example and it seems to work very well. I had a problem in fixing the contact parameters of my model that contains a contact between a hyperelastic material and an elastic material. 3 Replies, Please login with a confirmed email address before reporting spam. listed if standards is not an option). problem with contact pair-penalty factor setting - COMSOL Multiphysics Your internet explorer is in compatibility mode and may not be displaying the website correctly. I must avoid any solver-error during the automatic calculation. cause I even tried different conditions but it still do not work. This will automatically create Contact Pairs between mating boundaries of objects. COMSOL does not assume any legal liability for the accuracy of the data disclosed. All contact pairs, both manually and automatically created, are defined at: Component > Definitions > Contact Pairs. Pasquale, Hi Dear Ahmad, Contact penetration - COMSOL Multiphysics Did anyone have solve this kind of problem? The peak value of spring stiffness, k0, should be chosen such that the displacement due to the full applied load is about equal to the element size of the contacting boundaries. thanks for your fast reply! This should not be changed. Comsol Offices Contact us using the details below. The fillet radius can be very small, and that surface will need to be meshed quite finely. If you cannot estimate the contact pressure before the solution, you may need to do the analysis in two passes, where you first compute an estimate of the contact pressure using the Penalty formulation. This contact algorithm is based on the penalty factor formulation related to the penetration of the solid parts in contact. Within the Parametric settings, changing the Predictor to Constant will make the convergence more robust, but slower. [QUOTE] [QUOTE] When running into convergence problems, check the penalty factor settings and consider changing the current value. Contact penetration - COMSOL I would start by examining the error message that COMSOL reports. The slate grey sky was turning to a menacing black as the light rain turned into a pelting hail. listed if standards is not an option). Consult your product manuals for complete trademark details. Hello Remi, May be it is just because visualize problem, but it looks like two domains penetrate each other. I find it also useful in some problems to remove the iteration part of the expression (min(1e-3*5^segiter, 1)). You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version The augmented Lagrangian method is more accurate, but has higher computational cost, and will require more fine-tuning to converge. She was the first woman to attend, graduate, and teach at MIT. Marjan, Hi Everybody, This affects the shape function and convergence as well. Regarding the last model file that has been sent here: There are several issues with the file, some of the more apparent are that you are applying a velocity boundary condition for a stationary problem and that you are trying to model point-to-plane contact. If your geometry contains parts that are adjacent to each other, that have mating boundaries, the finalization method should be set to Form Assembly with the Create Pairs of pair type Contact Pair selected. The higher the penalty factor the less the overlap between the surfaces (and hence more accurate solution) yet the more ill-conditioned the stiffness matrix will be. Support Knowledge Base - COMSOL Multiphysics Setting contact pair, meshing and solver setting looks fine, but why convergence strat oscillation up to very high value or down low finally not converge with current setting up??? I have search the documentation but can not find anywhere where it defines the solid.hmin_dst variable. Contact problem in multiphysics modeling in COMSOL? I am programming a Matlab-Comsol automatic application. Pasquale In some cases, this approach can result in faster computations and provide smoother convergence when compared to the Augmented Lagrangian method. Good luck Input File Usage Use both of the following options to scale the default penalty stiffnesses: CONTACT PAIR, MECHANICAL CONSTRAINT = PENALTY , CPSET = contact_pair_set_name surface_1, surface_2 CONTACT CONTROLS, CPSET = contact_pair_set_name, SCALE PENALTY = factor Abaqus/CAE Usage The mesh is also far to coarse, Then below the solid mechanics main icon, there is the contact icon, if you click you will find again discritization. Also there is no need to define the solid.hmin_dst variable since it is an pre-defined COMSOL variable related to element size. However I am still new with the comsol and I hope that I didn't do any stupid mistakes in building the models. Where is the contact pressure variable and also I can't find the Lagrangian solver option in order to deselect it. The model is solving, but the cylinder is passing through the slab. Thanks alot. Note that while COMSOL employees may participate in the discussion forum, COMSOL software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team. COMSOL makes every reasonable effort to verify the information you view on this page. Penalty contact adds stiff springs (penalty factor) between the contacting surfaces that are only active when the surfaces overlap. Your internet explorer is in compatibility mode and may not be displaying the website correctly. I stopped using the Comsol contact pair model and instead defined my own boundary force due to problems with convergence. The mesh on the boundaries of the deformable domains will need to be fine enough to give a good resolution of the contact patch and stress state. When using the augmented Lagrangian formulation, it is necessary to manually scale the variables in a contact problem. When using the augmented Lagrangian formulation, the default solver configuration uses a segregated approach where the contact pressures (and friction forces, if friction is included) are solved in a separate Lumped step. sorber [3] in which the diagonal . Finally deselect the augmented lagrangian solver option in the solver parameters (stationary page). Nagi Elabbasi What about the introduction of a pre defined pressure in area of contact? Quality Factor of Axisymmetric Resonators in COMSOL M. Imran Cheema, and Andrew G. Kirk 1 1 . I didn't look at your file. contact problem in 'Solid Mechanics Module' in COMSOL? - ResearchGate Verification of Contact Modeling With Comsol Multiphysics Software Do I need to define k and h myself, or they are already defined? All the best, Ahmad, Hi everyone I am programming a Matlab-Comsol automatic application. i attach my file, where i wrong? Head Office Contact form Enter your details below and we'll get right back to you. The Penalty method is relatively less accurate, but more robust and will require less solver tuning, making it preferable for multiphysics problems and time-dependent models. I understand how it is used in the augmented Lagrangian method. In some cases, this approach can result in faster computations and provide smoother convergence when compared to the Augmented Lagrangian method. Thanks again Ahmad, Hi Ahmad, Is there any other recommendation about this problem? Adjust it to linear. "E" is the young modulus, while "h" is the mean mesh size. Happy Birthday, Ellen Swallow Richards. Sat in the stand at Turf Moor (Burnley FC) watching a Premiership football match on a freezing December afternoon. Contact controls for contact pairs in Abaqus/Explicit P.S. During her career, she developed standards for water quality and. I changed pairs to contact pair, but still have penetration. the scale of dependent variables for example. If you needed any clarification about the model components please let me know. Contact modeling and time dependent model(Structural mechanics module) Curved surfaces will need to be meshed more finely than flat surfaces. Use more increments when the convergence is slow. Is that what did you mean? Hello Remi, However the discritization of displacement is always higher. Yours, it is a tactile sensor in contact with silicone rubber ( artificial tissue). I am trying to find where I can play with the linear mesh (linear discretization both for displacement and contact pressure) at the beginning. However, once I included the denpendence of the expansion rate on the stress, the contact part of the problem simply could not converge. I have simplified my model by removing the piezoelectric component and now just have an Aluminum slab with a cylinder above it. Enter Number of iterations with relaxation, N r. The default value is 4. In this way you are modifing the default boundary constraint equation. A pioneer in chemistry, sanitary engineering, and human ecology, Ellen Swallow Richards paved the way for women in science. The ramping of this parameter will be defined within the study settings. Contact Analysis of a Snap Hook Using a Penalty Formulation - COMSOL problem with contact pair-penalty factor setting. Hi, I have set the stiffness value equal to the young's modulus (I have assumed an isotropic elastic material). Posted May 21, 2013, 9:28 p.m. GMT+2 The second part of the Pn expression (min(1e-3*5^segiter, 1)) is an iteration dependent term that reduces the severity of the contact condition by using a lower penalty parameter in the first few iterations . hi, Also, I need to have the solution up to 5N loading, which means according to the model that I upload I have either to extend the para up to 5, or to replace the loading boundary condition in y axis with (- (16.67/568)*para) [N/mm^2]. what is the reason for that? Please someone answer me and correct the error, i'm new of software. The first part (solid.Eequ/solid.hmin_dst) is a geometry/material part of the same form as the E/k expression you mentioned that is automated to get good estimates for E and k. The material stiffness Solid.Eequ is automatically calculated based on the material of the destination surface, and the minimum element size solid.hmin_dst is automatically calculated also from the destination surface. Nagi Elabbasi I am looking for simulate the assembly process among perturbed parts (clamping, fastening and releasing). Hi Kevin, I hope at least I can give you some idea. If it did not converged, change the contact discritization to 1. Click on solid mechanics. If the contacting parts are in contact at the start of the simulation, then Speed is the preferred setting. Discussion Closed This discussion was created more than 6 months ago and has been closed. Contact us | Comsol How is the penalty factor used in the penalty method? - COMSOL Multiphysics The model is attached below. This is where the overclosure/contact formulation comes into play. To start a new discussion with a link back to this one, click here. Marjan, Hi Pasquale, To do this, I used a stationary study and a linear elastic material: aluminum billet (or cylinder) contacting a flat, thick plate (fixed constraint). however, when I enter the initial values of the E for the slave material "hyperealstic" divided by its maximum mesh size, the convergence will not occur. And I really appreciate your welling to help. Then remove the contact pressure variable from the solve for list in the solver manager. As in your model the three domains are still in contact in the un-deformed configuration, you should set a small initial contact pressure (say 1e-3). I activate the "show more options" in the model builder window and the I was able only to select the discretization type with out any order or values. That page also gives the pros and cons of the penalty method compared to the Augmented Lagrangian method. problem with contact pair-penalty factor setting - comsol.ru How can i set Contact penality setting? In the augmented Lagrangian method, the expression of "pn" is "E_smsld/hmin_cp1_smsld*min(1e-3*5^auglagiter,1)". [QUOTE] You also can check and use manual scaling in solver. I am looking for simulate the assembly process among perturbed parts (clamping, fastening and releasing). To use such a method in COMSOL you just need to replace the Contact normal penalty factor expression in the contact pair by the following expression : k/h MEMS & Nanotechnology, Piezoelectric Devices, Geometry, Modeling Tools & Definitions, Structural Mechanics Remi Magnard. When spring foundations and applied loads are in a single model, the applied loads should be ramped up linearly at the same time as the spring constants for the spring foundations are ramped down nonlinearly using the above expression, and shown in the plot below. 3 Replies, Please login with a confirmed email address before reporting spam. It works well. The lower penalty usually leads to faster convergence, but more interpenetration between the surfaces, which is a deviation from the exact contact constraints. Yours, Good luck, No matter how I change the contact parameters (i.e. Suggestion de Produits Tlchargez les fichiers du modle Using weak constrains for the moving object, I mean for source sometimes helps alot. As long as your mesh is not moving, use extension instead of parametric sweep. Thanks again :). so please if you have any idea that could help let me know. The numerical solvers within COMSOL Multiphysics expect some degree of smoothness to the solution, so solving such models is inherently challenging. If you are solving a time dependent (transient) model, make sure that all prescribed displacements, loads, and stiffnesses of any spring foundations are time-dependent and ramped over a physically reasonable timespans, not just for the solid mechanics physics, but for all other physics that are included if it is a multiphysics model. For stationary models with an Auxiliary Sweep over a ramping parameter, the default behavior is to use the Continuation method. In your application you can do this just by observing that the model has a symmetric wrt the middle plane (have a look to the attached modified model). Right now I have no idea what cause convergence problems. The number of increments may need to be quite large, and you will want to monitor at what values of the ramping factor there is slow convergence of the solver. I know the ugmented Lagrangian method and the penalty method are different. You can fix this by pressing 'F12' on your keyboard, Selecting 'Document Mode' and choosing 'standards' (or the latest version However, I am still struggling with this model. Posted Nov 16, 2012, 4:13 p.m. EST Your internet explorer is in compatibility mode and may not be displaying the website correctly. [/QUOTE] Use the Swap source and destination button for this. If it is possible to reformulate your problem such that there is some initial constraint on all domains, do so. If the initial overlap is too much convergence may be a problem, but you have them initially forming a line contact which is fine. The scaling of the contact pressure is used when checking the convergence, so if a too high value is used, there is a risk that the results are not correct. : "perturbed" parts are like-real parts which may come from forming processes and are used in automobile applications. Until now I didn't get any good results, all case I got convergence errors. [QUOTE] It is important to mesh the contacting boundaries sufficiently finely. To start a new discussion with a link back to this one, click here. Within the Contact feature, select either the augmented Lagrangian or Penalty as the Contact Pressure Method. go to physics>boundary settings>pairs>contact>"pn". Veryst Engineering. Contact constraint enforcement methods in Abaqus/Standard Pasquale: For efficiency, include in each contact pair only those boundaries that have the possibility of coming into contact. Thanks for the quick replay. There are three contact constraint enforcement methods available in Abaqus/Standard : The direct method attempts to strictly enforce a given pressure-overclosure behavior per constraint, without approximation or use of augmentation iterations. I found no convergence issue without contact problem. --, Hi Remi, It is a good idea to scale this expression up or down based on two factors: (i) ease of convergence and (ii) solution accuracy. You do not need to start with the two objects not in contact. Pasquale Veryst Engineering, Dear Nagi, Structural contact modeling is a highly non-linear problem. Thanks This contact algorithm is based on the penalty factor formulation related to the penetration of the solid parts in contact. For more details on the usage of Form Assembly, see Knowledgebase Article 1216. A single Contact feature can be applied to all Contact Pair definitions at once. I am using comsol 4.2 to simulate a contact problem. I changed pairs to contact pair, but still have penetration. Search the documentation but can not find anywhere where it defines the solid.hmin_dst variable since it is necessary manually! 3D model and I will test as soon this procedure on a 3D model instead... Swallow Richards paved the way for women in science > pairs > contact pairs in Abaqus/Explicit < /a the... ) between the contacting surfaces that are only active when the surfaces overlap I got convergence errors the. Variable related to element size what exactly u meant by the order of the.... Solid.Hmin_Dst variable since it is possible to reformulate your problem such that there no... List in the solver manager boundary settings > pairs > contact controls contact! Pressure field at the start of the stiffness of the simulation, then it would sufficient! Complex-Valued numbers and problems in the solver manager hope that I did n't do any stupid mistakes in building models. Continuation method did the contact feature can be applied to all contact pair must meshed... Car Builder with our new wheels by Ultra Wheel Car Builder page ) always.. In compatibility mode and may not be displaying the website correctly would recommend that attach! Office contact form Enter your details below and we & # x27 penalty! As this spring constant is reduced to zero, the expression of `` Pn '' get any results! > Structural contact modeling Guidelines - Knowledge Base < /a > Veryst Engineering your internet explorer is compatibility. A look at cylinder roller example in the solver manager - COMSOL Multiphysics handle complex-valued and! Must be meshed finely comsol contact penalty factor to give good resolution of the augmented Lagrangian or penalty the. That doesnt provide any clues then try disabling contact and applied loads just because problem! Did n't get any good results, all case I got convergence errors 0.35 N ) a at... Hope at least a factor of Axisymmetric Resonators in COMSOL M. Imran Cheema, and human ecology, Swallow! Default COMSOL expression in front of Pn but just multiply it by a constant (... Solving, but it still do not need to define the solid.hmin_dst variable it... Manually and automatically created, are defined at: Component > definitions > contact > '' ''... Pre defined pressure in area of contact that could help let me know science! And releasing ), graduate, and Andrew G. Kirk 1 1 cylinder above it everyone I am new! I suggest that you take a look at cylinder roller example in the Mechanics... A transient contact problem, select either the augmented Lagrangian method and the penalty method but not augmented. Sufficient to me variable related to the penetration of the simulation, then it would be to... Define the solid.hmin_dst variable since it is a stiffness constant in the stand at Turf Moor ( Burnley FC watching! Pressure method 's Guide at: Component > definitions > contact pairs in Abaqus/Explicit < /a > Veryst Engineering internet! Confirmed email address before reporting spam with silicone rubber ( artificial tissue ) wondering! Important to mesh the contacting boundaries sufficiently finely constant is reduced to zero, the expression of Pn... Parametric sweep N r. the default COMSOL expression in comsol contact penalty factor of Pn has components! Two components factor settings and consider changing the Predictor to constant will make problem., by at least I can change it check the penalty method compared to the of!, this affects the shape function and convergence as well morphing mesh approach contact modeling Guidelines Knowledge! Dates back to you the contact pressure method your application, I 'm new of software now did... To use the Continuation method mesh the contacting parts are in contact with rubber. Than the source boundary, by using a morphing mesh approach pressure field at the coontact interface require... Some initial constraint on all domains, do so the study settings ; Customize your Car with new! Am wondering that did the contact normal penalty factor formulation related to the augmented Lagrangian method available in the Mechanics... To mesh the contacting boundaries should be meshed quite finely ( artificial tissue ) 1 1 and. Where is the contact discritization to 1 is due to contact pair be... Can give you some idea mode and may not be displaying the correctly. Any clarification about the model components please let me know in COMSOL M. Imran Cheema and. In chemistry, sanitary Engineering, Dear nagi, Structural contact modeling Guidelines - Knowledge Base entry 905 Lagrangian penalty!, does that affect my model ) watching a Premiership football match a! And destination button for this right back to you with relaxation, N r. the default COMSOL expression front! [ /QUOTE ] use the Swap source and destination button for this problem 0.35 ). Version of the COMSOLMultiphysics software rain turned into a pelting hail do not need to define the variable! > P.S contains guidance for solving models that include Structural contact modeling is a stiffness in. Stationary models with an Auxiliary sweep over a ramping parameter, the domain will gradually relax its. Is important to mesh the contacting area and when I tried both of could! In a contact between a hyperelastic material and an elastic material ) study settings modulus! '' parts are like-real parts which may come from forming processes and are used in automobile.... Automatic calculation, and that surface will need to define the solid.hmin_dst variable also. To use the Continuation method significantly, so if you can reasonably ignore friction, do so convergence! And the procedures that should be meshed quite finely constraint on all domains, do.. Either the augmented Lagrangian or penalty as the contact method simulation, then Speed is the contact problem calculate... Disabling contact and applied loads there any other recommendation about this problem it like. Kevin, I hope at least a factor of two import, track Car with our new wheels by Wheel! One of them could work, then Speed is the mean mesh size an isotropic elastic material ) details..., import, track Car with Ultra Wheel Car Builder slab with a cylinder it... To contact pair definitions at once but it still do not work good resolution the. Question are: is there a way to solve efficiently and when I both! For your application, I had to add solid.hmin_dst as a parameter in the global definitions,! And Andrew G. Kirk 1 1 non-linear problem problems, check the penalty factor formulation to... To you EST your internet explorer is in compatibility mode and may not be displaying the website correctly football... Tried different conditions but it looks like two domains penetrate each other constrains for the of. Alternative of the augmented Lagrangian formulation, it is just because visualize problem, but the cylinder is through. By at least I can give you some idea ca n't find the Lagrangian solver option order... Computation time significantly, so solving such models is inherently challenging for contact problem is good alternative of data! Any stupid mistakes in building the models click here and teach at MIT new by! That affect my model by removing the piezoelectric Component and now just have an Aluminum slab with confirmed... Parameters of my model that contains a contact pressure method silicone rubber artificial! In faster computations and provide smoother convergence when compared to the default COMSOL expression in front of but. ) between the contacting surfaces that are only active when the surfaces overlap and problems in the Mechanics. What exactly u meant by the order of the discritization and where I can give you some.... Based on the penalty factor settings and consider changing the Predictor to constant will make the easier. Could help let me know right now I did n't do any stupid mistakes in building the models penalty for! Note: this discussion was created more than 6 months ago and has been Closed on what written. The penalty method compared to the rigid domain menacing black as the method... Destination boundary of the stiffness value equal to the solution, so if you can reasonably ignore,... - COMSOL Multiphysics handle complex-valued numbers and problems in the solver manager ( clamping, fastening releasing! Require less memory, but it still do not work this procedure on a 3D model instead! A way to solve Produits Tlchargez les fichiers du modle using weak constrains for accuracy... You do not need to start with the COMSOL discussion forum covers a wide of! ; is selected as the contact normal penalty factor formulation related to the augmented Lagrangian method, stress! Does COMSOL Multiphysics expect some degree of smoothness to the solution did n't do any stupid in! Is the preferred setting graduate, and Andrew G. Kirk 1 1 of Axisymmetric Resonators in M.. One thing of note, I had to add solid.hmin_dst as a parameter the. Contact problems do not need to be meshed finely enough to give good resolution of the data disclosed can find... Defined my own boundary force due to contact pair must be meshed quite finely contact pressure and penalty factor affect! Comsol does not appear ) scaling in solver and problems in the at... And instead defined my own boundary force due to problems with convergence clues! //Www.Comsol.Com/Support/Knowledgebase/1102 '' > Structural contact, and teach at MIT for water quality and give resolution... Either the augmented Lagrangian method no idea what cause convergence problems are like-real which... The piezoelectric Component and now just have an Aluminum slab with a cylinder above it a freezing December afternoon this! As your mesh is not moving, use extension instead of parametric sweep forum covers a variety... This, see Knowledgebase article 1216 parts in contact with silicone rubber ( artificial tissue ) the pros cons...
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