Comsol and the Intel Xeon Phi
Hello everyone, We are considering building a workstation for use with Comsol. Does anyone know whether Comsol supports the new Intel Xeon Phi many-core co-processor, and whether it uses the Xeon Phi...
View ArticleVortex Tube Analysis
I am new to comsol. I am using ansys fluent. to analysis vortex tube in fluent there is an option called swirl dominant flow under k-epsilon. is there any option in comsol like this -- quiting is not...
View ArticleTwo Phase Transport PEMFC
Hi, I'm having problems in implementing the two phase transport in the Low-Temperature PEMFC model. Initially, I built a model composed by the following physics: 1. Secondary Current Distribution; 2....
View ArticleFrequency Detection with Piezoelectric Sensors
Dear all, I am trying to obtain the FFT(Fast Fourier Transfer) of a frequency reading that a piezoelectric sensor is detecting. The layout of my model is two piezoelectric sensors that send frequencies...
View ArticleDirect- Fully Coupled Solver [Strange Behavior]
Dear All I´m working on a Natural Convection Tower model. It has the Heat Transfer and Low Re K-e CFD interfaces. And I am using Time Dependent, Direct Fully Coupled method. I undestand that reciprocal...
View ArticleEquation-Based Modeling is dimensional or dimensionless?
Please help me to understand more clearly about dimension in the Mathematics branch (in Comsol 4.2). I would like to quote here some information from the User guide:"The Mathematics interfaces are...
View Articledefining a no-flux 2D surface on top of a 3D box
hi Everyone, i'm qiute novice to comsol and have the following problem: i need to to visualize diffusion in a 3D box made of GaAs that has a round mask on its top surface. now i know that i can just...
View ArticlePiezoelectric resonator with clamped edges
Dear all, I try to solve the next problem in COMSOL 5.2: 1. Brass beam with thin AlN film - flexural mode resonator 2. Electrical BC Ground and Terminal applied to electrodes area on top surface (no...
View ArticleSpur gear with permanent magnet creates a voltage in coil
Hi I'm trying to solve very interesting task but don't know how. A permanent magnet (Neodymium as material) is surrounded by circular coil both packed in aluminium case, so it's a magnetic sensor....
View ArticleThe other problem; out of memory during LU factorization
Hello, everyone I have a little different problem with others First, my error message is similar with the others"Failed to find a solution. Out of memory during LU factorization. Returned solution is...
View ArticleCoaxial feed with slot antenna
Hi everyone! I need to connect the coaxial feed with a slot antenna...I used a parametric surface as you can see in the picture but it doesn't work...How can I solve the problem? Thank you In the...
View Articlewarning: low minimum element quality
hi everyone, i keep getting a warning that says that the minimum element quality is low ... my sim runs but i get a crappy diffusion profile .. what to do and does this minimum element quality IS what...
View Articleprob plot of dependant variables Rtol and Atol ?
hi, for time-dependent study, fully coupled solver, is it possible to plot (similar to convergence plot) the relative tolerance and the absolute tolerance for each one of the used (simulated) dependent...
View ArticleFailed to find consistent initial values
Dear COMSOL users! I am trying to model wormhole formation during the acid injection in the reservoir. It is two scale model: Darcy scale and pore scale. I am using 3 physics: Darcy law, transport of...
View Articleerror
I try to do as photodiode 3D simulation model is two-dimensional. But I encounter the following error: Undefined value found. - Detail: Undefined value found in the equation residual vector. There are...
View Articlesolution results and iterations number
Hi, I am running time-dependent model fully copuled with termination techniques set to iteration and tolerance. I see under progress that the nonlinear solver reaches ~100% with the last iteration...
View Articleweak constraint or pointwise constraint
Hello, I would like to have ur opinion for this situation: I wish to constraint the (fluctuating) pressure to an average value of 20 [constraint expression: aveop1(p)-20] at the inlet boundary while...
View ArticleCompute study for only the 2D cross section of a 3D geometry?
Hi all, I have made a 3D model in COMSOL vs 5.2a of a microfluidics channel and am attempting to model the DEP response of cells in the channel to the presence of an electric field created by...
View ArticleHow to define the boundary conditions for oscillatory flow in COMSOL?
Hi I want to model an oscillatory flow passing fins inside a resonator. I need to define both of the velocity and pressure boundary conditions at the inlet (x1) and the outlet (x2) of the computational...
View ArticleModules
Hi, New to using COMSOL, basically I want to develop a PEMFC but do not have the batteries and fuel cell module. Is there anyway the user can manually put in equations etc? Also for analysis I want to...
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