Using simulated potential to simulate magnetic field.
I have a simple 5 domain model, composed of roughly concentric spheres. I am modeling a transmembrane potential on the 3rd domain using the General Form PDE physics. This part is working correctly. I...
View Articleabout solving
thank a lot for my last question the answered.. and now i will ask again about solving... there are many menu in solving.. and what the meaning about in submenu 'solve parameter' thare are...
View ArticleDrift-diffusion solution wihtout using Plasma module
I want to use comsol to solve drift-diffusion and Poisson equation in a coupled manner for a wire that has variable resistance (or charge density) across it. Charge density at each location depends on...
View ArticleCoupled PDEs, Last time step is not converged
Hi, I am new to COMSOL, and what I encountered is about coupled PDEs. I have two coupled PDEs in one physics model in general form. One is about heat transfer (T), the other is an ODE used for the...
View ArticleCoupling Poisson and Transport
Hi, I am using Comsol 4.3a and want to couple Poisson and transport for determining the flow of charge (or electrical current) within an wire due to application of voltage across it. Now, the output...
View ArticleParametric sweep : Can I bypass (ignore)the error occuring for a particular...
In coupled MEMS electrostatic study, I defined two parameters: Vdc and InitialGap. These two parameters were used for parametric sweep on the electromechanics module of Comsol 4.3. Now Comsol runs my...
View ArticleSpeed up a Computational Problem in COMSOL involving parametric sweep
Consider the general parametric sweep case: When I set up a non-linear FEM problem, it takes considerably more time than a Linear FEM case. The reason for this extra time taken is the extra effort by...
View Articleerror test failures
hi i use ccp module for simulation,my time range is range(0,5e-5,0.001) but when i compute model times go 7.579247e-019 to this and report this error Repeated error test failures. May have reached a...
View ArticleGaussian Distribution of Particle Size
Hi folks, does anyone know if it's possible to use a Gaussian Distribution of Particle Size function for the particle diameter in the Mixture Model interface? If so, can you provide an example? Best...
View ArticleAbsolute tolerance convergence criteria for flow simulations.
Hey. Normally convergence criteria are divided into a relative and an absolute. Where can I find and set the absolute tolerance for my transient flow simulation. Thank you for your time
View ArticleFluid structure interaction
Hi all! I have some problems simulating a "Fluid structure interaction". I start from this model www.comsol.com/showroom/documentation/model/361/ . I have tosimulate the mitral valve of te heart so l...
View ArticleConvergence problem with Comsol 4.3b
Hi Everyone When I run the model in the 4.3a, it can work very well. The convergence firstly is about 1e4 to 1e5. When the comsol software is updated from 4.3a to 4.3b, the convergence becomes 8e8 and...
View Articlesingularity. error
Hello, Does anyboday know why I encounter the below error message in Comsol 3.5a? Error: Time 7.86913096623935e-007: Repeated error test failures. May have reached a Last time step is not converged....
View Articlesingularity. error
Hello, Does anyboday know why I encounter the below error message in Comsol 3.5a? Error: Time 7.86913096623935e-007: Repeated error test failures. May have reached a Last time step is not converged....
View ArticleCOMSOL Error for Initial Values(RF Module)
I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...
View ArticleJava Runtime Environment error
Getting following error, A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x0000003da3efbc6c, pid=6909, tid=46912497239488 # # JRE version: 6.0_20-b02 # Java VM:...
View ArticleFluid structure interaction
Hi all! I have some problems simulating a "Fluid structure interaction". I start from this model www.comsol.com/showroom/documentation/model/361/ . I have tosimulate the mitral valve of te heart so l...
View Articlemagnetic field gradient in 3D return zero!
Hi everybody If anybody knows that why the gradient of magnetic field in 3D models is always zero? I checked the different methods. for example I wrote d(Bx,x) or different component of B and H. Even...
View ArticleConvergence problem with Comsol 4.3b
Hi Everyone When I run the model in the 4.3a, it can work very well. The convergence firstly is about 1e4 to 1e5. When the comsol software is updated from 4.3a to 4.3b, the convergence becomes 8e8 and...
View ArticleUnidirectional coupling of a time dependent study to a stationary study
Hello, I am using structural mechanics module and a stationary study to calculate stresses and strains in a simple 2D axi-symmetrical model. The model has a thermal expansion node. I have another study...
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