My biggest wish for X-mas: Solution for crack modeling
Dear Comsol gurus, dear support, my biggest wish for X-mas was, that the new 4.4 release would finally provide some reasonable approach for crack modeling as being standard in other software packages....
View ArticleUsing 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 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 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 ArticlePML error
Hi all, Can someone point me what I do wrong? I tried to repeat Scattering from plasmonic nanosphere model, so I have Au sphere + Air domain (sphere) +PML/ABC domain (sphere). When I defining PML as...
View ArticleHow to Couple Free and Porous Media Flow with Heat Transfer In Solids
Hi Everyone, I am new to COMSOL and I am trying to simulate a solar panel cooling system. I am trying to simulate in 2D the heat transfer between a thin rectangular layer (the photovoltaic cell),...
View ArticleHow to save deformed geometry so that it can be used as new initial geometry...
Hi. I am looking the ways to save the deformed geometry at the end of analysis, and i would like to use it as a completely new initial geometry for further analysis, by clearing out the previous...
View ArticleVarious Problems for Two Phase Flow coupling with Electrostatic
Hi! I am working on Two Phase Flow coupling with Electrostatic using transient (phase initialization and time dependent) solver to simulate electrospray phenomenon, I have encounter some problems and...
View ArticleSimulation error
Hi , I am getting this type of error whey i am trying to start simulation. "Variables property does not include all variables in Xmesh" Could anybody can give me any solution/ suggestion. Thank you...
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 ArticleFSI - High convergence problem
Hi all, I'm new to COMSOL and I have a problem that involves an interaction between air and a solid body. I am interested in the torque generated on the body by the moving fluid. My intent is to use...
View ArticleLaplace-Beltrami Operator on a Curved Surface
Hi all, When I use the Coefficient Form Boundary PDE (cb) on a curved surface, is differential nabla operator the generalized operator which implies the curvature, say, is the Laplace operator the...
View ArticleCombining pysics
Hey. I want to ask if there are any settings in COMSOL-e, when combining both effects of multiple physics into one calculation. For example, electric currents and laser heating in one componente behave...
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