Problem with Large domain
Hi I am simulating propagation through a simple waveguide in 3D. The simulation is working perfectly as long as the length of the waveguide is below 10um. When I increase the device length to 10um, the...
View ArticleSimulation for Atomic Layer Deposition system
Dear all, I used to simulate EM or optical problems by using RF module. It is my first time to use chemical reaction and CFD module. I would need your help to guide me to simulate my model. The model...
View Article3D graphics Problem and Cantilever Beam Error
Hello, I have attached my model. I have 2 problems. I am simply trying to make a cantilever beam but I get an error. Solver failed to find a solution. In fact it is a simple mechanism. Also, I can not...
View ArticleCoaxial port
What mode of the wave does the coaxial port excite? It does not give options of the modes to be excited. Please help!
View ArticleUpdate 1 for COMSOL Multiphysics 4.3b is now available!
Hello, Update 1 for version 4.3b of COMSOL Multiphysics contains lots of feature and stability enhancements, it can now be downloaded at: www.comsol.com/support/updates/comsol43bp1 If you have not...
View Articlecreating a materials function that change at the space ot a solid 3d elementes
hello, i have a problem with my model i want to change the materials properties ( young modulus ) every iteration without change the model geometry. for example a 3d slab (one block elements) and i...
View ArticleInputting Temperature Dependent Material Properties
Hi everyone, I'm new to comsol and still learning so my question might not be very difficult. I am trying to input the thermal expansion material properties which are temperature dependent. My model...
View ArticleNavier-Stokes Simulation using Coefficient Form PDE
Hi: I need to simulate fluid flow in a triangular duct, but I need to run it on a high reynold number. The problem is that when I run the model using the default "Laminar Flow" physics tab, I need a...
View ArticleIll-conditioned preconditioner
Hello, I am getting this error. Can someone please explain what is the reason of this error and how can I fix it? Thank you
View ArticleReflection of elastic waves
Hello, I am simulating rayleigh surface waves with the structural mechanics module in time domain but cannot get rid of the wave reflections at the boundary next to the surface. I tried of course...
View ArticleGRI Mechanism 3.0
Dear Sir / Madam I need to model two counterflow burners for measuring the NOx formation in case of natural gas combustion. For this purpose I need to upload the entire GRI Mechanism of methane...
View ArticleModel-step index fibre
Hi, I saw a pdf conference, in the Comsol conference 2010 with Anil Prabhaka and his work was about the Engineering Light and in the presentation he shows Model Library was a Tutorial called Step index...
View Articlelive link for matlab does not run the function trapz
Hi: I have a problem running the function trapz in the live link for matlab. Any one familiar with this?. Please help me. thanks, Naema
View ArticleCooling of gas & liquid within pressurized non-rigid tank
Is there a simple setup that can model the deflection of a non-rigid, pressurized, fluid-filled (gas & liquid) tank over time as the fluids cool via external natural convection? Setting the initial...
View ArticleProblem compiling Java due to model.save command
I want to load my comsol models using java files. I have determined how to create a java file and compile it using comsolcompile. The problem I am having is that at the end of the compiled class file I...
View ArticleExtract mesh connectivity info
Hi everyone I'm trying to find a way to extract the connectivity info of the mesh. Right now I have written a function in matlab that generate that info for me but it is very slow, because my models...
View Articleabout helix geometry modeling
Hi, I am trying to model a spiraling geometry (helix-like) with a complicated cross section. Does anyone know how to do it with comsol 4.2/4.3a? I used the build-in "helix" one but that was with a...
View ArticleThin Thermally Resistive Layer on top of Boundary Heat Source
Hello everybody, I want to simulate a flat mikroheater on top of a foil that is covered by a liquid. Since the foil has a thickness of about 100µm and the liquid covering the heater has a height of...
View ArticleEncountering error during meshing
when I try to run a mesh i encounter the following error message: "Edge is much shorter than the specified minimum element size." I do not know what this means and any advice on how to get rid of this...
View ArticleExport water table time series data from periodic Richards equation solution
Hi, is there an (easy) way to export a time series of the water table elevation (p=0 contour) from a time-dependent (periodic) Richards equation model? I have a 2D vertical rectangular grid with a...
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