Unlike steady state for study stationary and study time dependent
When I search the steady state by means of study time dependent, I find it. But when I search it by means of study stationary I can replicate the form of the curves, but not the magnitude. I mean, If...
View ArticleStrange boundary artifacts for two phase level set model
I built a model to investigate the case that viscous fluid from a pipe deforms on a horizontal surface. In the 2D axisymmetric model modified from the level set nozzle inkjet model, viscous fluid from...
View ArticleHow to solve discontinuity at the layer interfaces in 3D?
Hello, I am working on heat transfer in soils. I have a 4 layered model to simulate. Each layer has different properties. After I run the analysis I saw there is discontinuity at the interface of the...
View Articlefreaction of epsilon*mod(E)^2 calculation
I'm calculating eigenfrequencies of a PCF with a defect (core). For a trapped mode within the defect, how to calculate fraction of electric field energy (epsilon*|E|^2) in core? How to introduce...
View Articleconnection between two models
Hi, I'm simulating laser ultrasonics which involves the Thermal Stress Model and Solid Mechanics Model. The idea is to use the thermal expansion as an acoustic source and then let the elastic waves...
View ArticleGaussian Distribution of Particle Size
Hi folks, does anyone know if it's possible to use a Gaussian Distribution of Particle Size function for the particle diameter in the Mixture Model interface? If so, can you provide an example? Best...
View Articlehow many boundary condition should be imposed on spatially first order...
I'd like to solve a 1st order differential equation like this in 1d domain: du/dx =u x in [0,2] u(0) = 1000 while I was using the General Form PDE in stationary , there are two boundary point in x=0...
View ArticleCOMSOL closes when trying to compute
Every time I try and compute a problem in COMSOL the program closes on me. Below is a link to the type of laptop I am using.www.costco.com/HP-Pavilion-17z...-AMD-A4.product.100153835.html I'm still...
View ArticleCUDA and COMSOL
Dear all, I have a new NVIDIA Quadro GPU and I would like to use it to accelerate my simulations, is it possible to use it somehow? I looked for some informations and it seems to me that CUDA it's...
View ArticleLaminar flow without outlet (mixing with sliding wall) does not find solution
Hey, I have been trying to simulate a system where a sliding wall is causing convection in a closed box. In brief, the system is a box with one wall sliding at a rate of 0.01 m/s. The other walls are...
View ArticleHelp using the optimization module in comsol 5.0
Hey everyone, I'm trying to use the optimization module in comsol but can't seem to find a good documentation of the code for expression for comsol (5.0). What I want is simple I want to maximize the...
View ArticleTransferring temperature data to next analysis
Hi. I want to know how I can transfer temperature field data. I have a thermal-electrical and thermal-mechanical analysis. I don't want to perform the analysis in a coupled...
View ArticleNonlinear to linear
Hi, How can I convert a nonlinear problem to a linear problem by dividing the problem to smaller linear steps? It is usually needed when melting or plastic deformation takes place and convergence does...
View ArticleUse of multi steps
Hi, I have an elementary question. I have a multi-step analysis but i don't know results are related to which step, is it for both or one of them?
View ArticleUser defined functions from Matlab for COMSOL simulation
Hi, I am trying to model turbulent flow as well as time-dependent species equation in a certain domain, where the species concentrations at some of the boundaries vary with time (NOT known in...
View ArticleComsol 4.3a Memory problem -- not using enough RAM
Hello everyone, Usually the complain is that Comsol is using too much memory, but in my case its other way round. I have a really nice machine in the lab with windows 8 server. I have Comsol version...
View Article2D Axisymmetric and 2D simulation of permanent magnet
Hi, I am trying to simulate magnetic fields from a permanent magnet in simple 2D and 2D axisymmetric configuration using magnetic field no current module but COMSOL is erroring out saying that the...
View ArticleSingle-turn coil gap feed problem
Hello, I am trying to model gradient coils for use in MRI. I created a saddle coil geometry and I tried to run a study with the current direction specified by gap feed, but it fails to find a solution....
View ArticleCOMSOL crashes when computing
When I try and compute Comsol closes and I get this error message. # # A fatal error has been detected by the Java Runtime Environment: # # EXCEPTION_ILLEGAL_INSTRUCTION (0xc000001d) at...
View ArticleTime dependant temperature at the boundary
Hello, I am new in COMSOL, so probably this question will be really naive for you, but I need to ask. I want to apply in one of the faces of my model a temperature that is changing with the time , what...
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