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Coupoling the coefficient form PDE and the electrostatic module
Hi, I am trying to simulate the direction of the liquid crystal molecules inside a capacitor. To do that I need to solve the following PDEs.(1) Where V is voltage across the capacitor.(2) Where theta...
View ArticleRigid connector for applying load
HiI am trying to apply a force on a solid body from a point that is some distance from the body by using Rigid connector. I have a surface on the body and I made a Point in the space and I try to make...
View ArticleSonic Well Logging
I do need some help, I'm looking for some examples about waveguide of NDT, meanwhile, I've found the "Sonic Well Logging" , which is supposed to be very helpful, unlike the other examples, this one...
View ArticleGenerating 2D plots on Livelink MATLAB
Hello, I am trying to use the Livelink MATLAB application for COMSOL 5.4 and I seem to have trouble generating plots and viewing plots made in my applicaitonAre there any good resources/tutorials that...
View ArticleNeed Simulation steps
Hello i need all simulation steps of Computer-aided design representation of the needle-sphereelectrode geometry used for streamer simulation purposes.Kindly help me
View ArticlePiecewise Function to Define Young's modulus
Hi everyone,I tested some samples of a new material (tension & compression test) in order to obtain mateiral properties (at first Young's modulus). I want to compute a Comsol simulation with this...
View ArticleIssue with Time Dependent Study on Magnetic Field interface
Hi, I'm trying to do a time dependent study involving the Magnetic Field interface in the AC/DC module, but COMSOL just straight up won't do it & instead, gives me the error message as...
View ArticleSimulate pressure (fluid) through a pipe
Hi, I am a Student and don't have much experience with COMSOL.I want to simulate the pressure and stress on a pipe (like a very tiny syringe needle). The pipe itself is very thin and the material has...
View ArticleSimulating Underground salt cavern as storage for hydrogen
Hello,i'm trying to simulate the change of an underground salt cavern storage from methane to hydrogen. At the beginning of the simulation there is methane in the storage at 30 bar. From the top of the...
View ArticleA question about not being able to converge
Dear all,Attached is a COMSOL 5.3 model about making a nanogap between two gold electrodes on PDMS substrate, and stretch the PDMS substrate to see how nanogap distance changes accordingly.It works for...
View ArticleOutputting only the dependent variables using mphgetu while solving multiple...
Please find the attached models.I am solving a 2D cantilever problem to get displacements. I discretize my domain with 4 elements and I generate the matlab code to output the displacements. When I use...
View ArticleHow to build a viscoelasticity damping model of solid
I am studying the attenuation of ultrasonic wave in viscoelastic solid (using transient study). However, when adding a viscous damping subnode, I don't know how to get the viscosity parameter: bulk...
View ArticleFrequency Domain & Time Dependent studies
Hi all,I would like to simulate an object passing 'active' eddy current sensor (100kHz) to see the response of the sensor from eddy current in the object. I use moving mesh to create a moving object...
View Article2D Axial Symmetry Simulation rotation only 90degree
Hi,My name is Jaehoon and I am designgin acoustic transdecer.I was trying to run 2D axial symmtry only to rotate 90 degree not 360 degree but I do not know how to do it.For example, If I draw a square...
View ArticleNonisothermal Fluid Error
Hello, I'm simulating in comsol using nonisothermal fluid, heat transfer and fluid mechanics under turbulent flow regime.But I have this error:Division by zero. - Function: / Failed to evaluate...
View ArticleIs there a difference between the solutions in Livelink and the GUI
Hello, my team and I are staring to make use of the Livelink for MATLAB interface over the GUI recently.There is a concern raised that there may be discrepancies between the GUI and the Livelink with...
View ArticleFailed to find a solution for the initial parameter.
Hello, I am new with Comsol so I try to compute a vanadium redox flow battery with serpentine channel and an error message occurs: Failed to find a solution for the initial parameter. -Singular matrix....
View Articledenser mesh leads to non-convergence
Does anybody know why the model attached in the file below always lead to non convergence when the mesh in denser? coarser mesh always works with good accuracy but denser mesh always leads to non-...
View Articlemeshing of complex geometry and non-convergence
hi, i'm having problem with this geometry. everytime i run the simulation it leads to non convergence. the boundary condition is fine so i think my meshing technique is wrong. can someone help me out...
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