Failed to copy mesh due to different number of elements, but the number of...
I'm trying to create a periodic mesh on a stochastically generated geometry contained within a cubical domain. To ensure that the mesh is periodic I do the meshing step by step by first meshing three...
View ArticleIntegration of current density vector (J) on a surface
Hi everyone,I have understanding problem with results of integration of current density vector (J) on a surface. The J vector have same norm and tang (mostly x direction) component as you can see on...
View Article"Attempt to evaluate negative power of zero" error for large deformations of...
Hello everyone,I am having trouble simulating the bending of a flexible hollow tube when internal pressure is applied. A drawing of my system can be found in the image attached. The geometry consists...
View Articlenonzero difference in join dataset
Hello,I am using the Join feature to find the difference between datasets. However, when I join two of the same datasets, expecting to get a difference of zero, the difference is nonzero. Why isn't the...
View ArticleHow do I only use temperature values of center of mass of mesh element?
I'd like to only use temperature values of the central point in a mesh element. I know that I can use the centroid()-operator for a specific parameter, but how would I be able to change it globally for...
View ArticleLithium ion Battery Report
I was reviewing the automatically generated report in Comsol and noticed that the variables have expressions as to how they are calculated but the "shape functions" do not have expressions, how are...
View ArticleRepresenting an infinitely long conductor as a 1-D body in a 2-D space
Greetings,I am currently working on a simulation of a very thin superconductor exposed to an external magnetic field. The 3-D space is symmetric along the z-axis, and thus can be modelled as a 2-D...
View ArticleCOMSOL wont let me select walls for fluid flow (not applicable)
I am trying to find flow arouns an object. I have said object inside a block. The block is air, and the object is steel for now. Under turbulant flow, I cannot select the objects walls inside the block...
View ArticleHelp regarding porous flow simulation
I am having difficulty setting up a problem wherein the inlet and outlet tubes have normal flow of air(as in a pipe flow) and middle pipe has porous flow( with sand as the medium and given porosity and...
View ArticleEquivalent impedance of a metallic tip
My question is the following. I am working with piezoelectric material, more precisely with transducers. I have built an analytical expression for my transducer based on the electromechanical...
View ArticleProblem with time dependence initial conditions
Hello all,I am trying to do a very simple model of 2 iron blocks in thermal contact where their initial temperatue value is T=0C and only one side (boundary) of one of the blocks is set to T=100C with...
View ArticleChange direction of heat flow
Hi everyone. I am new to using this software and need some help please. I need to simulate a heat flow in a solid for a certain time. But after a while, I need that the convective heat flow to come...
View ArticleExplicit specification of damping constant
I am modeling a MEMS resonator in 3D using the structural mechanics physics interface.Experimentally, the response of the resonator closely follows the classical model of a 1D damped, driven harmonic...
View ArticlePiezoelectric Energy Harvester 3D
Dear Altruits, I am trying to model 3D piezoelectric energy harvestor. The automatically generating plot is showing the electric potential of the model. But when I am trying to plot 1D plot using...
View ArticleHow to consider the Thomson effect when I do Do numerical simulation of...
How to consider the Thomson effect when I do Do numerical simulation of thermoelectric generator
View Article"Underwater Acoustic" How to add hydrostatic pressure to The Official Case...
The Official Case Anechoic Coating, Application ID: 44201, Address: https://www.comsol.com/model/anechoic-coating-44201Dear all,I set my own simulation like the case model, but once I set the...
View Article"An Unexpected Error Has Occurred"
Hi,I have been trying to downlad COMSOL 5.5 to my 64 bit Windows PC. While I seem to download the program without any issues, every attempt to open it results in an message stating "An unexpected error...
View ArticleLegend window size
Hello Everyone, I want to reduce the legend window size. Legend window covered half of the results. I do not know how to do it in proper way in COMSOL. Please help me to fix this issue.Thanks
View ArticleHow to define a temperature field
I want to stimulate the natural frequencies for a certain model. In the COMSOL I can just define the whole model as a certain temperature like 300K. But for my model, the temperature in each point is...
View ArticleExport to Paraview (vtk/vtu)
Hello,I am trying to export my results from Comsol to Paraview. However, when I export the results in .vtu format, I loose the internal boundaries of my geometry and it appears as a uniform block. So...
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