Combining different mesh types
Hi everyone, I'm very new to Comsol. I'm trying to model a resistor with power running through a nichrome section, generating heat. Part of my geometry was extremely thin so I created a free triangular...
View ArticleError: Failed to find a solution, Singular Matrix, Returned solution is not...
Hi, I have a laminar flow module and it is based on an imported mesh. I changed the java heap space according to the tutorial in this COMSOL forum and also changed the iterative solver to direct solver...
View ArticleComsol and the Intel Xeon Phi
Hello everyone, We are considering building a workstation for use with Comsol. Does anyone know whether Comsol supports the new Intel Xeon Phi many-core co-processor, and whether it uses the Xeon Phi...
View ArticleCOMSOL giving me wrong Ks value!
Hi, I am using the Richards Equation interface and there is an equation relating kappa (permeability) to k (hydraulic conductivity) which is written in the documentation but I have calculated by hand...
View ArticleFailed to find a solution
Hi all, I am using Heat transfer in Solids and Solid Mechanics modules to find the thermal stress of a PDMS micropump that contains a fluid reservoir, where the fluid will flow out due to heat. I am...
View ArticleProblems Solving Model - 2D Parallel Plate Waveguide w/Coupler
All, I'm trying to model a 2D parallel-plate waveguide that has coupling structures attached to the parallel-plate (very similar to conical horn antennae). I want to simulate the waveguide using THz...
View ArticleSessile droplet
I want to put a sessile droplet inside a channel. How to create a droplet of a specific material ? and how do I choose the model ? As a reference I was wondering about the model in one the Paper - A...
View ArticleMoving mesh for contact pair
Hey, in my bachelor thesis i have to simulate a wire, which has to be pushed through a tube (they have contact) to get electricity/ heat. For this i used the physic "moving mesh" and "pdgl-...
View ArticleHeat Transfer in Solids+Solid Mechanics boundary conditions
Hi, I am trying to simulate the behaviour of optics components when being cooled down from 293K to 4K.I am using Solid Mechanics and Heat Transfer to Solids, where i am applying they temperature to all...
View ArticleUnpolarized light
Hello, I am trying to shine not polarized light on my structure, but I don't know how. I tried to do like if I polarized light but with no magnetic field. Meaning that took what is on the Fresnel...
View ArticleUnpolarized light
Hello, I am trying to shine not polarized light on my structure, but I don't know how. I tried to do like if I polarized light but with no magnetic field. Meaning that took what is on the Fresnel...
View ArticleHow to link Two physics in Comsol
I am solving a problem using Two physics Shell, Shell 2 (I applied shell to particular region, Shell 2 to remaining) , Comsol Solver is Solving Two physics separately and it is showing results...
View ArticleDefine a variable that is dependent on number of timesteps
Hi COMSOL community I have a time-dependent optimization model which simulation time (not computational time) is dependent on a Stop Condition, i.e. my simulation time differs depending on which...
View ArticleFluid flow in a heated flux media porous
Hello, I pretend to built a model where I simulate the heat transfer to air flow through a porous media (in a channel with an inlet and outlet). My fluid is the air and the porous structure is the SiC....
View ArticleIs it possible to solve "Static Mixer" in coupled mode?
Hello everyone, I'd like to solve the "static mixer" example with coupled physics. In the other words, I want to solve both "particle tracking" and "fluid" physics simultaneously. In the current...
View ArticleDoes COMSOL Utilize FEM or FDM or Both?
This is kind of a generic question, but I cannot find any straightforward answer searching online or the documentation. Finite Element Modeling as I understand, is more especially suited for structural...
View ArticleModel convergence dependent on mesh quality, confused!
Hi all, My COMSOL model only solves when the mesh size is "above" the predefined Normal size. When I increase the mesh resolution to "Fine" or higher, the step BiCGStab in the progress tab stalls at...
View ArticleModeling tuning a cavity
Hi, I am very new to COMSOL, but I think I am getting the hang of the system. I was wondering if anyone might have suggestions as to how I may go about modeling tuning a cylindrical cavity. I have...
View Articleerror using parametric sweep of COMSOL4.4
Hi, i am trying to simulate the weld pool procedure of laser welding, but some error happened when the model is computing. boundary temperature of domain is set as Tref+DeltaT, and “parametric”...
View ArticleThermal Micropump
Hi all, I am trying to build a model of a PDMS micropump that pumps a liquid stored inside its reservoir due to heat. When the air inside it expands due to heat, the liquid will be pumped out. The heat...
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