2D-plate-the initial strain
hi my model is a 2D rectangular plate with Linear Elastic Material, the material has spontaneous strain(εs11、εs12、εs13、εs22、εs23、εs33，Symmetry strain) which I consider it as prestrain. Now,I am trying...
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Is the loss in this model incorrect?
This model is a 2D axisymmetric model of a homogenous multiturn coil with a permanent magnet core. A second ampere's law with pure and constant magnetization is used for the permanent magnet.The study...
View ArticleProgress bar going backwards?
The progress bar in the bottom right corner of my COMSOL window does not steadily move towards completion of the simulation. It progresses a little, but then goes back to very little, then grows more,...
View ArticleUse the previous study solutions as the time-dependant loads for the second...
Hi, I am facing with a problem that the piezoelectric and convected wave equation analysis cannot be solved in one study because they are using different solvers. I am going to separate them into 2...
View ArticleFull field formulation vs scattered field formulation
Can someone explain to me the difference between the two?
View ArticleProcedure to add a new dielectric
Hello,I am using Semiconductor module and am simulating electric field in a Silicon material. Is there a way I can simulate LiF material as a dielectric between two silicon layers?Thanks!Sincere regards
View ArticleSurprising convergence issues in CFD
Hey,I'm trying to simulate a simple 2D fluid flow, but I have difficulties getting either a stationary or time-dependent result because of convergence issues. The liquid should enter from the defined...
View ArticleRotating Mode Stirrer in Room excited by log-periodic antenna
Dear Sir/Madame,I am looking into the effect of adding a mode stirrer to a room excited by a Log-periodic antenna on the electric field in the room. I would like to see how the electric field would...
View ArticleHow to apply current in r-z plane in a 2D AxiSym model?
Dear COMSOLers,In my 3D model (prenested in the COMSOL Discussion Forum here) I want to study the skin effect in the conductor body (in frequancy domian study). Because the condcutor thickness is very...
View ArticlePort power input and antenna efficiency
Hello everyone,I am trying to find the efficiency of a horn antenna I have simulated.The antenna has a circular port that is excited with TE11 mode and has 1W input power.However, when I integrate the...
View ArticleModeling Erosion of Porous Media
If I want to model erosion of porous media, what other module do I need in addition to the porous media flow module? I want to account for the removal of regions in the solid grains once the pressure...
View ArticleError/Uncertainty estimation in Heat Transfer Simulations
Hello all!I am curently simulating with Heat Transfer and Surface-to-Surface Radiation.I am currently seeking some guidance on how to verify the result calculated by Comsol. In general I would like to...
View ArticleError: Input file does not support batch licenses.
Hi,I've been using HPC to solve my COMSOL simulations for a while now without no issues. But recently I've came across the error of "Input file does not support batch licenses." in my log file in...
View ArticleSolid Mechanics & Deformed Geometry Coupling
The below post is related to an archived discussionI have a similar problem that has been discussed before in the forum, please see the link to the previous discussion. Similarly, there are two domains...
View ArticleSymmetry In Electrostatics Module
The below post is related to an archived discussion[start here]Hi, thank you very much!But why "Zero charge" is for symmetric boundary condition?Thanks!
View ArticleRadial component of Poynting vector
Hi There,I want to calculate the power flux along the radial dorection of a waveguide. I know the expression for this is P=0.5 (ExH).r, where r is the radial unit vector. But how to calculate it in...
View ArticleUndefined value found in the equation residual vector.
Undefined value found.Detail: Undefined value found in the equation residual vector. There are 66 degrees of freedom giving NaN/Inf in the vector for the variable comp1.phil. at coordinates:...
View Article2D Fluid Structure Interaction - Lagging/Overlapping Mesh
Hi all.So I have run into an odd problem with a FSI problem. The actual set-up of the problem is relatively simple, a pipe filled with water with a free moving piston head at either end keeping the...
View ArticleModeling specific custom material un comsol multiphysics
Hello Please, i have to do a study and i need to model API 5L X70 steel with comsol. Please i would like to have the instructions.Thank you...
View Article"Failed to generate mesh for domain" - from imported inductor component.
Hello,I have an imported .stp file that is a small inductor.I am trying to make a mesh out of it (and then eventaully find the magnetic field it produces with current running through it, which I am...
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