Error in solving dispersion relation for 2D Photonic Crystal
Hi, I have been trying to compute band diagram for a 2D photonic crystal similar to the one described in the documentation for ver3.5. I have been working on v4.3a and when I click compute, I face the...
View ArticleSide operator evaluated on edge not adjacent to given boundary number
Hi, I am currently working on acoustic-shell interaction problem and I came across a following error: "Side operator evaluated on edge not adjacent to given boundary number". Could anyone explain me...
View ArticleRadial mode of a disk resonator
I am simulating (both 2D and 3D) a radial bulk mode disk resonator based on a paper. The problem is when I use a non zero poisson's ratio the mode shape becomes distorted. With the same material data...
View ArticleError in the demo model ?
There is a demo example "Thermoelectric_leg.mph" available in the Multiphysics installation and it locates in directory c:\program files\COMSOL\COMSOL43b\demo\builder\thermoelectric_leg.mph". It uses...
View ArticleLivelink for Pro-Engineer error: ... PRO_COMM_MSG_EXE ...
Hi All, I have installed live link for Pro-Engineer 4.0. On the Comsol model builder right click and Livelink for Pro-Engineer. As i click on synchronize, an error report was appear: Failed to connect...
View ArticleNavier-Stokes Simulation using General Form PDE: The Continuity Equation
Greetings all. I am working to solve a standard fluid flow problem (e.g. flow in a pipe as a start) using the General Form PDE interfaces instead of the Fluid Flow built in GUI. I am able to define a...
View Articlecannot use old values as the initial values for new step
Dear sir or madam, I am using comsol to simulate a stationary model. I had convergence problems so that I was forced to vary the inlet BCs gradually to converge to the real case and I had to use the...
View ArticleDecyphering 'Axis Vector' error
When I attempt a Frequency Domain solution I get the following error message: "Errors during multiphysics. Two points describing the axis vector needs to be defined properly. " I can't find a reference...
View Articlewhy does "Undefined value found in the stiffness matrix" means?
I'm trying to simulate Photonic crystal. As far as I know, there is no need for me to know the stiffness of material in the crystal. However, when I click "compute", comsol always screen error message...
View ArticleProblems with parametric sweep
I have a model that I want to investigate with differens values on at least one of the design variables. If I change the variables value manually and compute, there is no problem but if i use variable...
View ArticleProblem 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...
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