How to set boundary conditions for the inner device
Hi all, My model is heat transfer in solid with the air effect. The big block outside is air and in it is a device, it is a silicon wafer with a heat source on it. If I have to use assembly mode, how...
View ArticleCoordinate systems: From 2D axial symmetry to 3D
Hey, I encountered a problem when modeling heating of a 3D copper cylinder in 2D axial symmetry. I tried to do an Arrow line plot in 3D over "total heat flux" but the arrows appearing are not...
View ArticleCalculating the heat stored in a solid sub-domain
Hi, I am solving a time-dependent heat transfer problem on a solid domain. The specific heat capacity (Cp) is a function of temperature. I would like to calculate the amount of heat stored in specific...
View Articlehow to understand the code of comsol in matlab editor.
how can i understand the code of programme that is developed with the help of COMSOL and saved as m file and now it is obtained in COMSOL MATLAB editor. how to get to know the curve it shows belongs to...
View ArticleSwitched reluctance motor - rotor and stator deformation - How?
Hi. I am building a 2D model in which I would like to showcase how the stator and especially the rotor of a switched reluctance motor deforms because of the radial and tangential magnetic force on the...
View ArticleAre all post-processing function only using single CPU core?
Hi all, I'm doing 3D eigenvalue simulations. I noticed that I can used pardiso direct solver to take advantage of multi-core CPUs. However, when I went to the point of post-processing, e.g. exporting...
View ArticleMicrofluidic Fluid-Structure Interaction
Hi, Everyone! I am fairly new to COMSOL, and during the process of learning fluid-structure interaction problem using the model provided by COMSOL 4.2a for fluid-structure interaction, I have...
View ArticleModelling counter-flow mass transfer
Hi ! I'm pretty new in COMSOL. I have a plan to model a counter-flow mass transfer in COMSOL 4.2. I've made the replica of dialysis model, which incorporate a concurrent flow of the dialysate and the...
View ArticleHow to model residual thin film stresses as a boundary condition
Hi Forum, I'm trying to model a thin Nitride film on top of a "thicker" silicon membrane, however, I cannot seem to find the right way of modelling the initial (tensile in-plane) stress in the thin...
View ArticleRAM Memory usage, Comsol 4.2a, RF module
Dear All, I have one question, maybe some of you have experience with that. Where I can find information about relation between number of degrees of freedom (DOF) and RAM memory I need for that number....
View Articlecap faces geometry
Hello, I imported my geometry from Solidworks using the "LiveLinks for SolidWorks" and I tried cap faces but every time I encountered the following error: "Edges must form simple loops". Does anyone...
View ArticleMore verbosity from errors
Hello im pretty new in COMSOL and Im having problems settting up a model. Working with turbulent flow + reacting flow I have the error Problem setting up multigrid Analysis x has no mesh defined for...
View Articlequestion about the memory
Hi to everyone, I would like to ask a question about the memory of comsol 4.3. When it formulates the mathematical problem comsol needs to construct some matrices which will result to one or two...
View ArticleProblems solving all physics
Hello! I'm trying to solve a problem involving fluids, electrostatics and transport of diluted species. When I launch the solver everithing seems fine. But when finishes just electrostatics or Laminar...
View Articleprobleme in imposing current, and measuring resistance
Hello I am a beginner in comsol and I want to calculate by geometry factor using the AC / DC module, of a cylinder with 70mm diameter and 20mm height. This cylinder contains eight electrodes (similar...
View Articlebringing B-spline surfaces into COMSOL
I have used MATLAB to define a series of B-spline parametric surfaces that I wish to knit together to a solid object in COMSOL. My current approach for bringing these into COMSOL is to create a...
View Articletic/toc in matlab for COMSOL
I have a model inside a for loop and occasionally it runs into an extreme parameter value and I want to just skip that iteration. I tried increasing the interations a lot and then saying skip the...
View Articlei m new to comsol 4.2 so if any one could help me in the micro beam resistor
about microresistor beam
View ArticleSimulation of a sollar collector
Hi everyone I'm a French engineering student and I need to simulate a solar collector in COMSOL multiphysics. I build the panel with glass, air gap, copper, water and insulation but I have a problem...
View ArticleDISPERSION Modeling
Hi frndz! I am working on a model of the dispersion of gases which i have uploaded here. It is time depended modeling and In stationary case there is no error but when i Run for TIME depended case i...
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