convergence problem
Hi, I am a newcomer to comsol. Here is my problem. I always meet too large convergence when I run the comsol. If i change something to fix convergence, the reaction rate will be very low and the model...
View ArticleSpecifying a demagnetization curve of a permanent magnet
Hi all, I use the magnetic fields interface (AC/DC module) to simulate a magnetic system with permanent magnets and soft iron parts. Currently I use the "remanent flux density" constitutive relation (B...
View Articlehow to make a triangle in comsol 3.5a
Dear users, Does anyone know how to make a triangle in comsol 3.5a. Any help will be highly regarded. thanks. Cecil
View ArticleI need a help for my combustion simulation
Hi, It's not the first time that I expose my problem here. Is there any person who can help me to show me how to simulate a combustion reaction? I already done many tutorial, but till now i didn't...
View Articlehorizontal stress only shows in the top layer
hi i'm simulating a road using the elastic model. the road has 3 layers (asphalt, foundation, soil) with different moduli. when I apply the loads of the wheels, I can clearly see how the vertical...
View Articlenonlinear kinematic hardening
Hi is there some possibility to define a non-linear kinematic hardening model like Frederick-Armstrong without building all mechanical equations out of the mathematical interface?
View ArticleWhich interface choose for fluid flow with heat transfer
Good day! I would like to ask for an advice. I wish to solve the following problem: I have a plate of a solid material with low thermal conductivity. There is a pipe with cold water inside the plate....
View ArticleWindowed integration of a far field pattern in RF module
Hi folks, In RF module, after I obtain the far field patter (RCS) of a scatter, I need to calculate the integral of the RCS at certain angle over its neighborhood and then plot the integration as a...
View ArticleStore part of solution for next run
Hi: I have 2D and 3D models of the same experiment which are in the same file. I would like to do two things: 1) Store the solution of the 3D run and store seperately the data from a "cutplane". 2) Use...
View ArticleApplying torque in COMSOL
I have created the drill string (pipes and joints interconnected alternatively 9 times) geometry in the XZ plane and defined the cylindrical co-ordinate system. Boundary load 10000 N is applied as...
View ArticleRe-build Thermoacoustics Module
Hey there, I am using the physics module to rebuild the 3 differential equations of the thermoacoustic module (please see attached). In the physics module I am using the coefficient form PDE (3D). In...
View ArticleDoubt with extrusion coupling
Dear all, I have been reading the documentation on extrusion coupling and the packed bed reactor example in which extrusion coupling is used. I have a couple of questions: 1) How to select the...
View ArticleImporting an Excel point XYZ elevation file into COMSOL for modeling ice flow
Hello, I have an microsoft excel spreadsheet that has 475 point locations with known latitude, longitude surface elevation, and depth of ice for each point on a valley glacier. I also have 40 locations...
View ArticleConjugate heat transfer Interface boundary condition
Hello All, I am new to COMSOL. I am trying to solve a 3-D conjugate heat transfer problem with volumetric heat generation in the solid domain. The problem is more like solving for a temperature profile...
View ArticleSpecifying location of an import CAD in the simulation
Hello Everyone, I've been searching for a while, but I have been unable to find a way to specify where in the design space you would like an import CAD to be located. Any help would be greatly...
View ArticleDifferentiation of electric potential
I have used Laplace equation module to compute electric potential for certain geometry. Now I would like to compute electric field lines, but I am not finding a way to do that. Please help regarding...
View ArticlePenetration and convergence in contact; viscoplasticity
Hi! My ultimate goal is to simulate metal extrusion, specifically interested in the streamlines of the metal flow as the billet deforms in the die. I'm applying a prescribed velocity at the top surface...
View ArticleTo find the temperature difference between two boundaries
I have built a model and found the temperature distribution over its surface. I want to plot over time the difference between the temperatures at two points over the surface. Please assist me in this...
View Articlesolid core photonic crystal fibers
hai. Iam doing research on solid core photonic crystal fibers I have doubt in calculating mode field diameter and confinement loss of solid core photonic crystal fiber Presently doing simulation using...
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