mef in time dependent
Hello to everyone. I have one question regarding the possibility to carry out a Time Dependent Study in mef. There is one good example of Integrated Square-Shaped Spiral Inductor...
View ArticleHeat loss in hydraulic hose
Hi, I'm working on an project where it's in my interest to find the heat loss to the surroundings, from the hydraulic fluid inside a hose. I have access to Comsol Multiphysics 4.3 through my work and...
View Article2D interpolation of material properties as function of Temperature and Pressure?
Hi, I see that COMSOL 4.2a allows 2D interpolations, how would that be used to interpolate fluid properties, such as density, conductivity, cp, etc, as functions of temperature and pressure of the...
View ArticleUsing interpolation to define temperature-dependent material properties
Hi, I am a COMSOL beginner. Trying to added a file containing temperatures and measured material properties and then utilize an interpolation function to define the temperature-dependent material...
View ArticleProblem with 3D PDE thin layer mesh
Hi everyone I encountered a problem with meshing a thin layer(~10e-6m) with 3D PDE model. I am not sure how to mesh such thin layer. Has anyone managed to mesh a similar case? Looking forward to your...
View ArticleProblems about Periodic Conditions in the tutorial model “Periodic Boundary...
Hi all, Recently I confront one confusion about periodic conditions in the tutorial model - Periodic Boundary Condition. In Periodic Condition, it selects only boundaries 1 and 6 which are parallel...
View ArticlePreparation of figures for papers/thesis?
If it has been written somewhere, can someone point me to where there is a guide to producing figures from 2D plots? I am using COMSOL 4.2a, and want to use some surface plots alongside legends of the...
View ArticleRF Source
Hi, I want to apply a current or a voltage source to a rectangular surface in a COMSOL RF module problem. Would you please let me know how I can do that? Regards, Elham
View Articlemust i compute the whole programe again?
Hello, I am a beginner of comsol. Most of the time, i made mistakes and got different solution from references. Then i changed Model settings and tried to find the right solution. But usually it take...
View ArticleModelling Metallic Diaphragm
I am a novice COMSOL user using the software for a student project so apologies if my problem below seems simple. I have a 2D axisymetric model of a thin metallic diaphragm (approx 25mm di and 0.025mm...
View ArticleLimiting simulation volume/area or displacement for mechanical model
Hey, while doing a buckling study of an optical fiber I tried including a fixed box around the fiber to constrain the movement of the fiber within this box. Sadly this increases the required simulation...
View Articleweak form of transient heat conduction in solids
Hello all, I'm trying to come up with a transient weak formulation of heat conduction through solids. The equation of interest is: rho.C.dT/dt + del(q)=Q I have already successfully implemented the...
View ArticleHeavyside-Function and Divison by Zero
Hi I stumble realising a Gaussian-beam like in the tutorial model "Nanorods" (using RF-module). Problem: Part of the wave function has a singularity: constant/z Solution in tutorial: Define a...
View ArticleInconsistent uni-directional constraint with Conjugate Heat transfer
I am trying to model a simple high temperature hydrogen heat exchanger with the conjugate heat transfer module. While I have been sucessfull in modeling individual tubes of the hydrogen alone, I cannot...
View ArticleHow to implement a biphasic asymmetric waveform?
Hello everyone. I'm trying to figure out how to implement a biphasic asymmetric waveform in Comsol 4.3a. I need to be able to use the following electrical simulator settings in order to stimulate an...
View ArticlePMLs in the Mathematics (PDEs) Module
Hi all, I'm having trouble making PMLs work in the PDEs module. I'm just working on a toy model at the moment - the diffraction pattern example from the model library but with a PML on the outside of...
View ArticleAdding a Faxen Force on Stokes drag force in Particle Tracing Module
Hi everyone, I am trying to use the particle tracing module with a non-uniform laminar flow in a channel. I am using "Drag Force" to trace the particles' motion. However, the Stokes force is defined...
View Articleerror in pulsatile waveform stenosis
hii, I am solving pulsatile waveform for velocity inlet in Steonsis. As the waveform is regular so i have to cut into 3 pieces and used interpolation to get equation for them. I assign 3 equations of...
View ArticleMeshing Error
Hello everyone, i want to attach the electrodes to the boundary of my model , but when i am try to mesh or add the sub domains, it shows me error"Could not resolve subdomain relations" could you please...
View ArticleFailed to find the consistent initial values
Dear sir, I am getting an error after solving as follows"Failed to find the consistent initial values Last time step is not converged. - Feature : Time - Dependent Solver1 (sol1/t1) - Error : Failed to...
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