Latest Discussions - COMSOL Forums https://www.comsol.com/forum/ Most recent forum discussions Fri, 10 Jul 2020 09:48:45 +0000 COMSOL Forum: Latest Discussions https://www.comsol.com/shared/images/logos/comsol_logo.gif https://www.comsol.com/forum/ The soft nail calculation basis of the band diagram corresponding to the wave vector of phonon crystal in COMSOL software https://www.comsol.com/forum/thread/264793/the-soft-nail-calculation-basis-of-the-band-diagram-corresponding-to-the-wave-ve?last=2020-07-10T09:48:45Z <p>Hello, I would like to ask what theoretical basis (equation class) is used in comSOL software to draw the energy band diagram corresponding to phonon crystal?In the lower part of the energy band diagram, I found a large number of participating factors, effective modal quality and other parameters. How does comsol software connect these data to draw the energy band diagram?</p> Fri, 10 Jul 2020 09:48:45 +0000 4.2020-07-10 09:48:45.264793 Inward current https://www.comsol.com/forum/thread/264791/inward-current?last=2020-07-10T07:25:16Z <p>Ciao tutti</p> <p>"Inward current density" as a boundary condition troubles me. How is "inward" defined? I used that BC and then checked what the electrolyte potential at that boundary was. Then I changed the BC to "Electrolyte Potential" where I inserted the value I got from the previous run, and evaluated the current density. It had an opposite sign to the first run. Hence, my conclusion is that "inward" means towards the simulation domain. Am I right?</p> <p>Lasse</p> Fri, 10 Jul 2020 07:25:16 +0000 4.2020-07-10 07:25:16.264791 Elastic Wave Propagation in Anisotropic Media and PML https://www.comsol.com/forum/thread/264771/elastic-wave-propagation-in-anisotropic-media-and-pml?last=2020-07-09T23:29:18Z <p>Hi Everyone,</p> <p>I am experiencing an issue regarding PML in anisotropic media. I am interested in wave propagation in anisotropic elastic media thus the PML is also the same medium as propagation domain with anisotropic parameters. However, I never get convergence of results by changing the simulation size/PML size etc. I saw reflections from PML. I also did the simulations for isotropic media and everything works.</p> <p>Does anybody know any issue regarding PML implementation in the case of anisotrpic media?</p> <p>or Should I take care some additional degrees of freedom such as symmetries or strech parameter etc. for the implementation in the case of anisotrpic media?</p> <p>Regards, Burak</p> Thu, 09 Jul 2020 23:29:18 +0000 4.2020-07-09 23:29:18.264771 Need help understanding the correlation for heat generation between the 1D and 3D models in batteries https://www.comsol.com/forum/thread/264762/need-help-understanding-the-correlation-for-heat-generation-between-the-1d-and-3?last=2020-07-09T22:27:06Z <p>I am new to COMSOL and have been going through some of the tutorials for batteries. I completed the tutorial 'Thermal Modeling of a Cylindrical Lithium-ion Battery in 3D' and have a question about one of the steps.</p> <p>At one point in the tutorial it has you put in a variable for heat generation (Qh). The expression for Qh is :</p> <p>nojac(comp1.aveop2(comp1.liion.Qh))<em>(L_neg+L_sep+L_pos)/L_batt</em>((r_batt-d_can)^2-r_mandrel^2)<em>(h_battd_can</em>2)/((r_batt^2-r_mandrel^2)*h_batt)</p> <p>Looking at this expression it looks like it is using Qh from the 1D model for the 3D model. I've looked through the 1D model and can't find a value for Qh anywhere. Can someone explain the correlation or how COMSOL is using the 1D model to get the heat generation in the 3D model?</p> <p>Thank you for your help,</p> <p>-Nate</p> Thu, 09 Jul 2020 22:27:06 +0000 4.2020-07-09 22:27:06.264762 How to implement Robin boundary condition ? https://www.comsol.com/forum/thread/264752/how-to-implement-robin-boundary-condition?last=2020-07-09T20:57:46Z <p>Hi,</p> <p>I'm trying to define a Robin boundary condition like "alpha<em>(T1-T)=k</em>dT/dx" for a heat transfer problem (time dependent). My first try was defining convective heat flux q0=h(Text-T), here the equation says -<strong>n.q</strong>=q0, so I assume if I define convective heat flux, I'll get the boundary condition as what I need. But the result shows that at this boundary, the line graph for q0 and k*dT/dx are too much different.</p> <p>I guess this is not the right way. Any other idea? Thanks a lot!</p> <p>Jing</p> Thu, 09 Jul 2020 20:57:46 +0000 4.2020-07-09 20:57:46.264752 Two way coupling of PDEs https://www.comsol.com/forum/thread/264742/two-way-coupling-of-pdes?last=2020-07-10T00:01:55Z <p>Hi all, Essentially I have 2 coefficient form PDEs. The first equation solves for dependent variable u, while the second equation solves for dependent variable q. For the sake of simplicity, the equations can be assume as such: du/dt = q+1; gradient q = u. I will be solving this with a time-depdent study. How would one couple these two equations?</p> <p>Big thanks</p> Thu, 09 Jul 2020 20:08:19 +0000 4.2020-07-09 20:08:19.264742 Failed to find a solution. Singular matrix. https://www.comsol.com/forum/thread/264732/failed-to-find-a-solution-singular-matrix?last=2020-07-09T20:00:40Z <p>I am getting the following errors while doing simulations. While doing meshing, I did not get any error but after running the solution it showed me all the below errors. Please help!</p> <p>1) No mesh on domains 1-6 in the meshing sequence with tag mesh1. This may lead to incorrect results.</p> <p>2) Failed to find a solution. Singular matrix.</p> <p>There are 2859409 void equations (empty rows in matrix) for the variable comp1.T. at coordinates: (8e-05,5e-06,0.00025038), (8e-05,4.75e-06,0.0002485), (7.675e-05,3.5e-06,0.00025033), (7.625e-05,3.5e-06,0.000250305), (7.625e-05,1.5e-06,0.00025038), ...</p> <p>and similarly for the degrees of freedom (empty columns in matrix). Returned solution is not converged. Not all parameter steps returned.</p> Thu, 09 Jul 2020 20:00:40 +0000 4.2020-07-09 20:00:40.264732 EMF measurement in the secondary coil of a flat transformer. https://www.comsol.com/forum/thread/264721/emf-measurement-in-the-secondary-coil-of-a-flat-transformer?last=2020-07-09T17:11:38Z <p>Hello, I am a new user of COMSOL, at the moment I'm trying to build a model of a flat printed transformer. The model includes two square-shaped coils: primary and secondary, located inside the primary.</p> <p>The function of the exciting current in the primary coil is set using the standard built-in function waveform (sin). For each coil, the conditions of the coil are set, the input and output are indicated. The materials of the coils and the working medium are identified. As a result, I can’t get the EMF in the secondary coil, maybe this is due to my poor knowledge of all the functions of COMSOL, and I get the EMF value, but I just can’t get it out for clarity.</p> <p>If you have encountered such a problem or modeled a similar model, please tell me how to solve this problem or what could be the error. I enclose screenshots of the main parameters and the appearance of the system. Respectfully, Alex</p> Thu, 09 Jul 2020 16:14:31 +0000 4.2020-07-09 16:14:31.264721 Muscle-Tendon Interface https://www.comsol.com/forum/thread/264712/muscle-tendon-interface?last=2020-07-09T15:58:01Z <p>Hello everyone,</p> <p>We are trying to model the material properties (elastic modulus, density, etc.) as they shift from tendon to muscle to bone. We are aware of using analytical, interpolated, or piecewise functions to describe the material properties in terms of spatial coordinates, but are unsure which function type would be best to pursue.</p> <p>Are there preferred ways of defining material properties of biological interfaces in COMSOL?</p> Thu, 09 Jul 2020 15:58:01 +0000 4.2020-07-09 15:58:01.264712 Average pressure at the meniscus https://www.comsol.com/forum/thread/264701/average-pressure-at-the-meniscus?last=2020-07-09T13:19:56Z <p>Hello, I am new to comsol and working on the capillary flow using Lamiar flow phase field method. Is it possible to calculate the average pressure at the meniscus exactly. Meniscus is an isosurface with constant volume fraction(0.5). I am able to construct a cut plane and get an average value of pressure along the cut plane. But meniscus is not a straight plane, so getting average pressure is difficult. Is it possible to use the meniscus surface as a cut plane and get the average value of pressure? Moreover if the meniscus is complex (due to geometrical constraints) the pressureis different at different points. So, is there any way to find pressure across the meniscus. Please find the meniscus shapes to get a better idea.</p> Thu, 09 Jul 2020 11:55:46 +0000 4.2020-07-09 11:55:46.264701 Stationary and Time Dependent giving different solutions? https://www.comsol.com/forum/thread/264691/stationary-and-time-dependent-giving-different-solutions?last=2020-07-10T08:35:30Z <p>I've successfully modelled a transport of coupled dilute species, electrostatics and deformed geometry problem in 1D and I'm now trying increase it to 2D. I'm having an issue with concentrations going negative in a particular regions of my model, depsite using the same boundary conditions that were successful in my 1D model. At the moment I am ignoring the deformed geometry and trying to solve the stationary case to use as initial values for the deforming time resolved case. The stationary model converges, but with the negative concentration region.</p> <p>What's interesting is that if I use this erroneous solution as the initial condition for a time resolved study of some arbitrary time I get a reasonable looking result for all time steps (i.e. no negative concentrations and good agreement with the 1D model). So the time-resolved solution for what should be a static system does indeed look static but the stationary solver on the same system will not give this result.</p> <p>Does anyone have any suggestions as to why this would be?</p> Thu, 09 Jul 2020 10:13:38 +0000 4.2020-07-09 10:13:38.264691 Get specific time https://www.comsol.com/forum/thread/264682/get-specific-time?last=2020-07-08T23:27:29Z <p>I am running a time-dependent model using a kappa-epsilon turbulent model. There is a convergence reached in the segregated solver plot by fluid (velocity and pressure variables) and the turbulence variables. However, the postprocessing time is 0 seconds. I would like to know how to get the specific time used by Comsol in the postprocessing velocity plot with the convergence reached.</p> Wed, 08 Jul 2020 23:27:29 +0000 4.2020-07-08 23:27:29.264682 Peeling Test https://www.comsol.com/forum/thread/264672/peeling-test?last=2020-07-08T21:30:03Z <p>Hello all,</p> <p>I want to compare my experimental data with the simulation in COMSOL, so I used the Cohesive model as reference. However, it produces error and fails to find a solution.</p> <p>Overall Setup: * 3D Model</p> <ul> <li><p>2 layers(first layer Mo and second layer SS)</p></li> <li><p>Solid model: Isotropic</p></li> <li><p>Initial crack 30[mm]</p></li> <li><p>Total length 100[mm]</p></li> <li><p>Force applied at the edge from the top layer.Study>Step1: Stationary> Parameter( Force[range(0,1,300)] )</p></li> <li><p>Fixed constrain (lower layer)</p></li> <li><p>N_strength,S_strength(8%<em>N_strength) , GIc and GIIc (8%</em>GIc )from the experiment.</p></li> </ul> <p>Desired Results</p> <ul> <li>Plot Froce-Displacement</li> </ul> <p>I have constrained the lower layer, so I just apply a force and i was expecting to get the maximum force and displacement when the peeling start.</p> <ul> <li> <ul> <li>Feature: Stationary Solver 1 (sol1/s1)</li> </ul></li> <li>Failed to find a solution for all parameters, even when using the minimum parameter step.</li> <li>Undefined value found.</li> <li>Undefined value found in the equation residual vector.</li> <li>Returned solution is not converged.</li> <li>Not all parameter steps returned.</li> </ul> <p>Do you have any ideas about improving the model?</p> <p>Thank you for your help.</p> <p>Roger Ona</p> <p>Attachments:</p> Wed, 08 Jul 2020 21:27:27 +0000 4.2020-07-08 21:27:27.264672 Problem with Loading and Vibration Response of Stacked Plates https://www.comsol.com/forum/thread/264652/problem-with-loading-and-vibration-response-of-stacked-plates?last=2020-07-08T21:57:30Z <p>I want to test various loading conditions and the vibration response of a metal plate on top of a rubber pad. I have set up a model with the following conditions, but it produces errors and fails to find a solution.</p> <p>Overall Setup:</p> <p>• 3D model</p> <p>• metal plate on top of a rubber pad</p> <p>• force applied on top surface of metal plate</p> <p>Desired Results:</p> <p>• Plot displacement</p> <p>• Plot stress</p> <p>Current setup and issues:</p> <p>Before testing a frequency-driven loading force, I wanted to test static loading to make sure there were no issues in the setup. I’m not sure what isn’t working, since I think I’ve constrained everything to only allow movement in the vertical direction and I’m looking for stress and displacement.</p> <p>Geometry: Two blocks created, one on top of the other. Assembly formed with contact pair created at midplane for block contact. Materials selected for each block and required properties applied. (See attached image)</p> <p>Physics: Solid Mechanics physics was selected. Boundary load node applied on top surface of top block. Contact pair node applied to contact pair between the blocks. Fixed face node applied to bottom face of bottom block. Roller node applied to sides of top block.</p> <p>Study: Stationary study was selected.</p> <p>Error during computation:</p> <p>• Failed to find a solution.</p> <p>• Maximum number of dogleg iterations reached.</p> <p>• There was an error message from the linear solver.</p> <p>• The relative residual (0.58) is greater than the relative tolerance.</p> <p>• Returned solution is not converged.</p> <p>• Not all parameter steps returned.</p> Wed, 08 Jul 2020 19:50:30 +0000 4.2020-07-08 19:50:30.264652 I would like to modify the default equations in the semiconductor module https://www.comsol.com/forum/thread/264642/i-would-like-to-modify-the-default-equations-in-the-semiconductor-module?last=2020-07-09T10:04:50Z <p>I am planning to modify the default drift-diffusion equations under the Semiconductor Material Model. Also, I would like to add a new equation related to exciton concentration into the simulation.</p> <p>Here are the equation I want to modify. <img class="latexImg" src="data:image/png;base64,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" /> <img class="latexImg" src="data:image/png;base64,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" /></p> <p>I read some of the post in the forum, and they said that I could modify the equations in the equation views panel. I have tried to understand the variables and weak formula in the equation view but I found that it was very complex. I want to find the weak expression or variables related to this equation, but I cannot find the ones correspond to this equation. Could anyone give me some hints how to modify the equation?</p> <p>Also, I want to add a new equation related to the concentration of exciton. The equation is very similar to the drift-diffusion equation of electrons and holes. Is it possible for me to add some equation similar to the default drift-diffusion equation by using the PDE interface and couple it with the semiconductor module?</p> Wed, 08 Jul 2020 16:54:31 +0000 4.2020-07-08 16:54:31.264642 Linear motion of a magnet moving around a coil in 3D https://www.comsol.com/forum/thread/264641/linear-motion-of-a-magnet-moving-around-a-coil-in-3d?last=2020-07-08T18:47:15Z <p>The below post is related to an <a href="//www.comsol.com//forum/thread/225111/linear-motion-of-a-magnet-3d">archived discussion</a></p> <hr /> <p>When modelling the linear motion of a magnet around a coil or other ferromagnetic materials in 3D, it seems that (1) moving mesh is requred for large motion; (2) magnetic field, no current interface is requred to enclose the identity pair so that continuity coupling only involves the magnetic scalar potential; (3) magnetic field interface is required for the domains with coil/current. The problem is: how to couple the magnetic field, no current interface with the magnetic field interfance. Without proper coupling, the two interfance just works separately. This coupling is automatic in rotating machinary.</p> Wed, 08 Jul 2020 15:55:47 +0000 4.2020-07-08 15:55:47.264641 Solving two coupled 1D governing equations https://www.comsol.com/forum/thread/264631/solving-two-coupled-1d-governing-equations?last=2020-07-08T13:14:19Z <p>Hello, I want to solve two coupled 1D governing equations for solute transport in a fracture-matrix system. The equations are written in the attached document. I know that this problem can be sovled by applying the interface of "transport of diluted species in porous media". However, I want to use the interface in "Mathematics" for a trial. The problem I met is that I do not know how to handle the coupling term in the equation in COMSOL. I think that I may treat it as a source term but this source term is dependent on location, which I have no idea how to implement in COMSOL. Could you help me how to deal with this issue? Many thanks in advance! Shuo Meng</p> Wed, 08 Jul 2020 12:51:10 +0000 4.2020-07-08 12:51:10.264631 Prestressed frequency analysis is not supported in Beam interface https://www.comsol.com/forum/thread/264613/prestressed-frequency-analysis-is-not-supported-in-beam-interface?last=2020-07-10T09:17:21Z <p>Hi,</p> <p>when I analyze a shell-truss-beam coupling system by 5.5 version, a error always appearred as 'Prestressed frequency analysis is not supported in Beam interface'. but if I use 5.4 version to analyze this problem, the error will not appear. Do you have any ideas about this? Thanks very much for your help.</p> <p>Lin</p> Wed, 08 Jul 2020 07:31:31 +0000 4.2020-07-08 07:31:31.264613 model.component() undefined for v5.2 with JavaSE1.7 https://www.comsol.com/forum/thread/264612/model-component-undefined-for-v5-2-with-javase1-7?last=2020-07-08T18:33:00Z <p>I'm trying to work with a collaborator using v5.5 and when importing his code via eclipse/JAVA I get errors on all the model.component() lines in eclipse.</p> <p>The method component() is undefined for the type Model example.java</p> <p>Do I have to use modelNode for 5.2 instead of component?</p> Wed, 08 Jul 2020 06:10:02 +0000 4.2020-07-08 06:10:02.264612 Mesh Cell Dimensions https://www.comsol.com/forum/thread/264602/mesh-cell-dimensions?last=2020-07-08T18:18:05Z <p>Hi all,</p> <p>I am trying to calculate the conductivity at each point along the length of a semiconductor using the equation:</p> <p><img class="latexImg" src="data:image/png;base64,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" /></p> <p>But my question is how can I find the individual L (x dimension) of a cell from my mesh to do this calculation. All I can find is the parameter 'h' which is the length of the longest edge of the element, and that is not along the correct direction (in my particular model the longest edge is along the y direction). Any suggestions will be welcome!</p> Tue, 07 Jul 2020 18:17:50 +0000 4.2020-07-07 18:17:50.264602