error " Reached end of data when reading"
Hi, I faced a very strange error related to my COMSOL files. The problem is, when I save a comsol file, I cannot open it again. The message error is “Reached end of data when reading”. I’m sure that...
View ArticleAssigning velocity as a boundary condition
Hi I am modeling an electrophoretic phenomena where the governing equations are - Navier Stokes equati - Poisson equation - Nernst Plank equation This is an axisymmetric model containing a half circle...
View ArticleDefine an arbitrary EM wave
Hello I am new in Comsol and i have a problem : i want to calculate SAR for SAM phantom for different types of EM waves. but the source of EM waves ( signal generator ) isn't important. is there any...
View ArticleWill the increase of the relative tolerance reduce the solving time ?
Dear all, as mentioned in the title, I would know if the change (specifically an increase) of the relative tolerance in Time Dependent solver (but also in Stationary solver, why not) will reduce the...
View ArticleHow to couple Soil Plasticity with Subsurface Flow Module?
Dear All: I am a beginner of using COMSOL for soil mechanics study. Recently, I am trying to study the influence of subsurface flow process on soil deformation. I use Richards Equation to get the pore...
View ArticleHeat Transfer after Deformation (Contact Pair)
Hi, i am trying to model heat transfer between two concentric cylinders where inner one is heated. The inner cylinder is pressurized and eventually touches the outer one. For modeling structural...
View ArticleSimple Magnetoresistance Model
Hi, my apologies in advance for what is probably a trivial question - I am new to Comsol. I am attempting to create a simple model of magnetoresistance. I have defined a permanent magnet in the MFNC...
View ArticleOpening COMSOL 3.5a files in COMSOL 4.3b
How can I open COMSOL 3.5a files in COMSOL 4.3b?
View ArticleSetting convergence condition in fluid simulations
Dear Sir/Madam I'm a novice in COMSOL use. I have a question regarding convergence in fluid flow simulations. I know that in FLUENT one has the possibility to set the divergence of velocity field to a...
View ArticleChemical Engineering Module using mechanistic scheme computed by Matlab
Dear all, I'm totally beginner on Comsol and i need some help. I've already solved a mechanistic scheme on Matlab which solves the evolution of the average molar mass of a polymeric material depending...
View ArticleMMI waveguide design...using PML
Hi, I'm new to COMSOL, attended one of the workshops and have been going thru the tutorials. I'm trying to design a slab waveguide...with a core refractive index of 3.48...cladding of 1.54....about...
View ArticleAxisymmetric Hertzian Contact mechanics model
Hi, I am trying to model a sphere pushing on a surface. To do so, I have created a 2D axisymmetric model with a point load close to the apex of the half-circle; as putting a point load right at the...
View Articleflload not working
Hi everyone, i'm new to comsol and I have a problem with COMSOL-with-MATLAB. I have the 4.2a release and matlab 2011b. I need to use a .mph file in matlab and my colleague suggested me to use the...
View Articlewhat is value of "relative permittivity" for gold (au) and aluminum (al) ???
any buddy help me to tell what value should make appropriate result in actuator of relative permittivity - au ____?? relative permittivity - al ____??
View ArticleSet geometry/boundaries using a variable?
Hello, I am trying to solve the device physics equations for a 1D (eventually 2-3D) solar cell with the PDE solver. However, a solar cell of fixed total thickness and two physical layers typically has...
View ArticleData import from one simulation in comsol to another
Hi, I checked the heat transfer in solids for my structure and now I need to use this heated up condition as an initial condition to cool down the device and see how long it will take, (time dependent...
View Articleenergy storage model (joule unit)
Hello sir I have a simple 2D model which has energy storage in the middle of model. I want to see how temperature profile changes with time. To simulate my model, I need to 1000J(joule) in storage...
View ArticleHardware upgrade: how to compare AMD to Intel?
I am looking into upgrading to a High Performance Computing work-station to do mostly computational fluid dynamics computations in COMSOL. Aside from sufficient RAM and appropriate number of...
View ArticleQuestions about defining different variable in different equation in subdomain
Hi, I am now using PDE model to slove Laplace and Poisson equations. My model has three domains. I have used V as the variable in Laplace equation in two dielectric domains outside and V0 in Poisson...
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