Problem 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...
View ArticleSloshing Tank with FSI
Hello All I calculate the waves of a water tank and then damp with a structure the waves. At the beginning I start with a single excitation an then wait and just let the gravity do the job. My model is...
View ArticleIll Conditioned Preconditioner
Hi everyone, I haver been trying to untangle this ill conditioned error with different meshings, which I think is the cause of the error. The temperature distribution in the soil (from 3D plot group -...
View ArticleE or E1 or E2 in my plasma model
Hello, I am trying since some days now to "copy" the microwave heated 2D model to a different geometry. My geometry is axial-symmetric in real. But I first started it in 2D only, but since I am not...
View ArticleHow to define Function in Definitions / Variables.
I'm currently working on electrical simulation using AC/DC module. I define nonlinear electric conductivity for zinc oxide material using following function(ZnO) in subdomain settings, but it shown...
View Articledomain deformation while doing moving mesh
Right now i am solving a moving mesh problem where the particle is moving in the domain. i have used moving wall and prescribed mesh velocity for the problem. It is doing fine for sometimes , however...
View ArticlePeak-to-peak amplitude in Comsol 4.3a ?
Hi I need to evaluate the peak-to-peak (pk-pk) amplitude of a voltage, which means the difference between the maximum positive and the maximum negative of a waveform. Are there any predefined function...
View ArticleHow to set displacement from study 1 as prescribed displacement in study 2?
Hey, I have a trouble with defining a prescribed displacement. Let's say that i received displacement of the edge caused by heating of sample. But displacement of this edge is different in every point...
View ArticleThere's pressure gradient, but no velocity, anyone can help me out? thanks
Hi, I'm using the Free and Porous Media Flow module to simulate the fluid flow on the particle level. I used it for 2D condition and it worked. When I switched to 3D case, something weird happened. I...
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