"Initial values of variables solved for" for t != 0
Dear COMSOL Users,I am trying to use results of a stationary study as initial values for a time-dependent one. The topic was handled in the forum quite often, but nevertheless, there are three open...
View ArticleECM (electro chemical machining)
if any one is working ecm process in 3d geomerty. please help me because i am also working on ecm
View ArticlePoint heat source in axial symmetry at origin
Hi all,I want to model a simple point heat source at the interface of 2 materials. I can make finite cylindrical slabs of material in 3D with the point source in the middle but it would be much more...
View ArticleStreamfunctions vorticity formulation in cylindrical coordinates
The below post is related to an archived discussion[natural convection in axisymmetric cavity fluid is air . Stream function-vorticity formulation. I can't find the mathematic partial equation for : 1-...
View Article3d design for simulating loud speaker
Hello,I have solved for 2d axisymmetry to get the Total Harmonic Distortion of a speaker {Can refer pdf of Transient Analysis of Loudspeaker Driver}. But if I want to find the same for a 3D design then...
View ArticleTumor- boundary condition
The below post is related to an archived discussionHi, I wanna simulate and analyze a tumor in COMSOL. I am a little confused about the boundary condition and some other aspects. Is there anyone can...
View ArticleShrinkage modelisation
Dear all,I have a question regarding the setting the cast of polymer molding in Comsol. I want to simulate the shrinkage process of a plastic part in a mold, during which volumetric shrinkage happens...
View ArticleGaussian-weighted surface temperature
Hello; i need to calculate the Gaussian-weighted surface temperature for surface heated by gaussian and periodic laser beam. Any idea how to find this weighted average value? Thank you, HM
View ArticleOn nonlinear diffusion
Hello, I am working on a system of a reaction diffusion ( whose solution is u1) and two ordinary differential equations (whose solutions are u2 and u3). The problem is that the diffusion term in the...
View ArticleAn unexpected error occurred while opening comsol
Help! Help! Help! Yesterday, I used Comsol normally, but today I can not open it anymore. The detail error is given as follows. The solution to rename/remove the vXX folder located at...
View Articleseismic acceleration time history input
I am modeling structure fixed on the ground，the acceleration time history need to be apllied to the boundary .So I have to set prescribed displacement/rotation and prescribed acceleration to the...
View Articlethe unit of the emitted power
I am modelling an LED using comsol and I want to get the LED emitted optical power . Then I used the "semi.ot1.dP_dE" which name is the emitted power per unit volume and energy and the unit of the...
View ArticleCan one program Comsol to iterate through the physics of a model?
I have an electrode stack and need to solve for the potential at each one of the 37 electrodes when only one is powered while the rest aren't. That is, Enable electrode 1 at 1V, the rest of the...
View ArticleLimiting a Variable over a Domain
I was wondering if it is possible to impose a constraint on a variable over a given domain (an upper bound specificallly). For example, if I would like to limit the concentration of a species to less...
View ArticleGREAT SPELL CASTER DR ONIHA BRING BACK MY EX HUSBAND NEED HELP EMAIL...
I have always promise to recommend you to people out there who might also need your help, cause finding your website was a Godsend. Even better,Dr Oniha,you're the most considerate and compassionate...
View ArticlePEC/PMC on the boundaries of the cubic unit cell
How one can apply the boundary conditions or PEC/PMC on the boundaries of the cubic unit cell if the angle of polarization of the incident electromagnetic wave is rotating? For example, the angle...
View ArticleThermodynamic simulation of isochoric process
Dear all, I would like to know the possibility to simulate a thermodynamic isochoric process in a closed volume of gas (for example N2). Is this possible in COMSOL?Nice regards
View ArticleResults of Parameter Estimation
I'm trying to do inverse heat transfer problem with Parameter Estimation module. All works fine, however I can't understand where I can find result of optimization. How can I see the value of parameter...
View ArticleMaking a license server available to engineers "in the field" i.e. over the...
Hi all,I'm an IT professional rather than an engineer but have been approached by a COMSOL client wishing to make his floating license available to his engineers whilst they are working at client sites...
View ArticleHow to update parameter value at each step in COMSOL solver?
Dear community,I have a numerical problem I am trying to solve where I have to replace a variable inside my PDEs with an integral value calculated at each time step of the numerical procedure.So, call...
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