about 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 ArticleVanishing geometry in nano level
Hi I'm trying to plant some nano-cylinders on a larger cylindrical base of [um] dimensions. When I plant 3 cylinders on top with 200[nm] radius, everything works just fine. But if I reduce their sizes...
View ArticleStudy 1 error
Hello, I want to ask some questions. I can try make an example e-core magnet design. There is an error in the Study 1 section. When I right click the Study 1 and select show default solver, an error...
View ArticleSolid Oxide Fuel cell (SOFC) model in fuel cell and batteries section
Dear All I was using the solid oxide fuel cell (SOFC) model available in the COMSOL library of Batteries and Fuel cell. However in that model, I found that the user needs to input the inlet velocities...
View ArticleCan't add point load to shell.
I can't add a point load to my shell for some reason. I've tried adding all points, and the non-corner point has (not applicable) written after it. Please could someone help me understand why this is...
View ArticleHeat in inductor using Induction Heating
I'm working on a model to see the temperature in all of the parts within the inductor. Since I'm using the Induction Heating physics I have to excite the inductor using Lumped Ports. However the...
View Articlemeshing big geometry
Hi how to divide a big geometry of 100 m length and 1-200 mm thickness into several sub geometries to enhance the mesh quality? Is there any node in comsol to do ?
View ArticleHow to turn on display of domain/boundary/point numbers (in Model...
A very simple question for which I cannot seem to find an answer! ..... nor successfully managed to locate it within documentation. In the Graphics Window within Model Builder, it is often desirable to...
View ArticleProblem assignment of material parameters (properties) in porous materials
I am using poroelasticity module. There are porous material and fluid in the model. When I assign the properties of porous material or fluid, I need to choose which domain I should assign. The fluid...
View Articleexternal pressure direction in Two-phase flow, moving mesh(tpfmm)
Hello every one! I have a question I'm trying to build simulation using laminar two-phase flow, moving mesh(tpfmm) and there is a external fluid interface with external pressure and surface tension....
View ArticleElectrode modeling - diffusion
Hi everybody, I am new to COMSOL and I need to model a 2D problem. I have two electrodes (a generator and a collector) immersed in a support electrolyte of 100mM of KCl in which there's a 1mM of...
View ArticleJoule Heating and Laminar Flow in microfluidics
I'm trying to find the temperature distribution in a microfluidic channel. The heat is generated by two electrode in a microfluidic channel. When I create the model without laminar flow everything...
View ArticleThermal expansion of a liquid
Hi all, I’m am trying to produce a model of a fluid enclosed on all sides except one by fixed constraints(walls), on the remaining face a thin diaphragm is in contact with the fluid. As such this is a...
View Articleperistaltic pump
Hello, I have some question about peristaltic pump the model Comsol, "peristaltic_pump.mph (Model Library Path: COMSOL_Multiphysics / Multiphysics / peristaltic_pump) ". (a) The Comsol use this...
View Articlegeneral pde mode, spherical coordinates
Hi, everybody I want to solve a differential equation in spherical coordinates (just “R” component dependent) By “General PDE mode” (comsol3.4). But there is no default spherical coordinates in the...
View ArticleVariables & Functions in Comsol 4.1
Hi, I am trying to do something very simple that worked perfectly in 3.5a, but that I cannot reproduce in 4.1. I have the feeling that I am totally missing something, but I do not know what. I define a...
View Articlecomsol software
Hai sir, i'm studying final yr electronics and instrumentation dept... i do my project based on 6 axis torque force sensor using comsol software.. so please give your opinion and suggestions....
View ArticleHeat Transfer in Soils
Hi, I am a comsol user and I want to have a 2d axisymmetric model. In my model, I have a soil sample that I put a steel bar in the soil. I want to heat the steel bar with a constant temperature 500(k)...
View ArticlePressure boundary conditions
Hi All, I am working on a coupled problem involving a piezoelectric and fluid.....I need to apply the pressure from the piezoelectric after each iteration step and apply it as a pressure boundary...
View ArticleProblems with sweep mesh
Hi, I have been trying to sweep mesh a domain (3-D). It will be like a small straight tube of rectangular cross section and having turns at right angles (like a serpentine). I tried to mesh the source...
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