Moving heat source / Gaussian beam really in 2D? - Symmetry issues?
Hi all, I am aware that the Gaussian Beam/moving heat source issue has already been extensively discussed in the community and I have spent quite some time reading through the various posts. However, I...
View Articlesolid domain deformed in a moving mesh
Hi, all, The problem in my simulation is a particle which is set as a solid domain deformed in a 2D, transient simulation. I am doing the simulation of a movement of a particle suspended in a...
View Articleelectrostatic actuated resonator
Hi, i m trying to design a resonator. A Cantilever model, with elastic material as a Gnd in the middle and two electrodes (top and Bottom electrodes) as a terminal. A voltage will be applied...
View Articlerigid connector
Dear colleagues, I need to constrain the center of rotation of a rigid connector with a spring. Is there the possibility to do that? It might be easy to do if I could use an existing point as the...
View ArticleProblem of using femtime() in COMSOL 3.5a
Hello all, I use femtime() in matlab to solve a dynamic FE problem as follow: fem.sol = femtime(fem,'Tlist',tspan); where tspan is an equally distributed time list. tspan = [t0,t1,t2,...tn]. Now, I am...
View ArticleExecute COMSOL Ribbon buttons with VBA
Does anyone know if there is a way to execute COMSOL ribbon buttons (for example, it 'clicks' the mesh button or it clicks plot group and selects the correct plot)? Basically, what I doing is creating...
View ArticleBoundary Load in structural Mechanics Module
Hi everyone Does anyone have any idea how the Boundary load relates to the displacement or deformation or strain.. of the corresponding boundary? [ in 2D] Actually, I'm looking for a formula. for a...
View Articledefine mixed boundary condition?
Hi to all, How can i define a mixed boundary condition? I can not find a way to write an equation like du/dx = (alpha/beta)*u alpha & beta are constant. Tanx.
View Articlephotonic crystal fiber
Hi, I am a beginner of comsol v 4. I tried to design a pcf with hexagonal pattern of airholes (five rings). pitch=2um and d=1 um. I got real part of effective mode index but don't get any imaginary...
View ArticleBoundary Conditions for Z-Axis in a 2D Simulation (Solid Mechanics)
Hi, I'm having difficulty figuring out how to set desired boundary conditions for the Z-axis in a 2D solid mechanics simulation. I would like my model to be infinite along the Z-axis with a fixed...
View ArticleReg CNT PRESSURE SENSOR
Hi, Im working on piezoresistive based pressure sensor ,after executing it now im working on SWCNT based pressure sensor . SWCNT which is semiconductor . so, im strucked at elasticity matrix and voigt...
View ArticleStress gradient of anisotropic material
Hi, I am using the anisotropic Silicon material parameters and was wondering how to apply a stress gradient to this. I've tried some equations manually and I'm not getting the same results from my...
View ArticleConstraint for variable in PDE- Mode
Hi everyone, I'm trying to simulate fractures by using a phase field model. The variables u and v describe the displacement of the body and s is the phase field variable that describes wheter the...
View ArticleMesh Problem
Hello, I have problem with mesh generation for my model. I made a 3D glass beads with lots of grains. When I want to mesh that I faced some error in meshing. sometimes it meshed but then during study...
View ArticleHow to duplicate solution in Matlab
Hi all, I am now using the COMSOL Livelink for Matlab. I create two solutions whose soltags are 'sol1' and 'sol2' respectively. I want to copy the solution from 'sol1' to 'sol2'. Here is what I am...
View ArticleA 'net' like material - allows water to go trough but not particles?
Is there a possibility to define such a material? I want to do particle tracing a in fluid, but some of my walls require to allow water to go trough but to not particles ( or according to size..)
View ArticleNew version 4.4
Hey. I want to ask: I want to set geometry in version 4.4 Snap coordinates to OFF. But when klick mouse on this option nothing happens. Can someone help me? Thank you.
View ArticleParameter selection for plots
After performing a parametric sweep study a selection menu is available in the plot settings. I have noticed that the selection menu for parameters can appear in two different ways. - Normally I get a...
View ArticleTips to overcome the error 900 when forming a union
Dear everyone, For few yeasr now, I am importing complex geometries done under Solidworks. Even if all my geometry is clean in SW, COMSOL fail to import it, or fail to form the union in the geometry...
View ArticleAnalyzing AC electric field for a cable
Hi, I wanted to analyze the electric field created by a 400kV AC cable to find the effect on dielectric. When I tried it using stationary solver for es field, I got the perfect answer. When I tried it...
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