how to plot the specific value vs time? (heat front vs time)
Hi there,Could you please tell me how to plot the curve of the specific value vs time? Such as the 1D transient heat transfer case (Tinitial=10 deg, Ttop=10 deg, Tbot=-10 deg), if I want to show the...
View ArticleFar field profile of grating
Hello,I am trying to simulate the far field of a grating. In my simulation I am using periodic boundy conditions and a port exitation. When I am cacluting the far feild profile, it seem that it did not...
View ArticleNames of Boundaries
How can the boundaries that there are in COMSOL be named according to their names in the CAD geometry imported from SolidWorks?×Names do not need to be "string", being "number" is enough.
View ArticleUsing output of a study as input in a new study.
Hello,I am trying to run a time dependent CFD problem with a variable flow rate, and obtain the reaction forces on the wall of the lumen. Then I would like to apply these reaction forces in a new time...
View ArticleScaling of heat transfer coefficient with Thickness in 2D heat transfer/fluid...
Hi,I'm modeling heat transfer of a simple cylinder in convective flow in 2d, with a defined volumetric heat source (General Source in W/m^3).If I add a constant heat flux to the outside of the...
View ArticleCorona discharge in COMSOL
Hello guys, I just started to learn COMSOL, and I found a weird thing that makes me confuse a lot. I was trying to simulate the plating on the cathode and checking the corona discharge. First, I made a...
View ArticleRandomize any surface thickness
Hi everyone! I would like to know how I can make rough curve surfaces. To clarify: I started generating a random surface, as explained here, but I want to fit it to a curve surface, such as a sphere...
View ArticlePhase Change in Two-Phase Flow
Dear all,I am trying to solve a two-phase flow problem, where one of the fluids is a gas and the other a polymer melt. Isothermal computation works out of the box without any severe problems.However, I...
View ArticleMovable boundary condition while using stationary study
Dear all,I want to model a process in steady state modling (like etching a sacrificial layer with a constant rate) but the boundary condition (BC) is required to be changed for every steps (imagine a...
View ArticlePhase field with mass transfer
Hi !I'd like to use a phase field model (meaning a potential like Cahn-Hilliard with interface energy) but with mass transfer between the phases. Unfortunately, the Phase field Physics doesn't allow...
View ArticleAdding a Mass Flux to Slope Stability Model
So I am trying to add a mass flux to a model with richards EQN to a model, but it doesnt add the way it should be adding. How do i add a mass flux to a model
View ArticleFlux boundary condition
I recently noticed the flux boundary condition in the new version is different from the old versions. For the flux boundary n.j=j_0 is j in the domain always considered as the diffusive j=-D(grad c) in...
View ArticleJava: Invalid cd root dir error
Hi I'm trying to install Comsol on a Ubuntu 18.04 machine. However when I run:./setup in the installation folder the terminal prints:./setup: line 756: [: /home/joey/Documents/2019-4/Install: binary...
View ArticleHow to choose a particular freq？
I get 4 eigenfrequencies by the eigenfrequency study and study step, and now I want to caculator the width of the 1st and 2nd eigenfrequency（for example: freq(2)-freq(1)），but I dont know the correct...
View Articlewhat's the meaning/definition of initial magnetic susceptibility
hello! I am studying the ''non linear_magnetostriction'' model in COMSOL. I'm confused about the meaning of "initial" in "initial magnetic susceptibility", whcih is a parameter of magnetostrictive...
View Articlehow to couple two shell face? rotation component?
I know that I can define the prescribed displacement to make the two boundaries coupled in solid mechanics module. But how can I do this in shell module, specifically the rotation component?
View ArticleThermally and Hydrodynamically Fully Developed Flow
Hi, I am trying to model a thermally and hydrodynamically fully developed flow (laminar flow) in a channel. I am using the "Fully developed flow" boundary condition for the "Inlet" (hydrodynamically...
View Articlesimple test case not converging.
Hi all,I have a simple setup to understand the logic of COMSOL and FE simulation:linear elasticity, strutural mechanics interface, time-dependent study type.a block of aluminum, give a "prescribed...
View ArticleComsol 5.2 not starting on Debian
Hello there!I'm desperately trying to get Comsol 5.2 running on Endless 3.5.8 (Linux/Debian) but it won't.Can anyone help me out here? Thanks in advance, Kevin
View ArticleExcuse me, what is the difference between S parameter and S parameter, dB ？
What is the calculation formula for the two types of parameters？
View Article