Modelling a 3D coil geometry for mechanical simulations
Hi all, I am doing some research on coils' mechanical properties under Joule heating. I am having problems creating models for coils with a cross-section that is not circular. See the attached image...
View Articletwo phase flow through a micro channel
hi i have a discussion about the two phase flow in a micro channel with constant heat flux at one side of wall my aim is to find out the transition point..ie the point where the liquid change its phase...
View ArticleInterpolation method in parametric surface
Recently, I have trouble in using parametric surface, because my bottom and top surfaces are close enough and change abruptly somewhere. When I use parametric surface in COMSOL, the two surfaces would...
View ArticlePECVD: Microwave Plasma convergence?
Hello, I am still fighting for my models to converge, where do I have to look for the trouble? The start is the 2D-waveguide model from the Library. I just inserted an extra substrate into the plasma...
View Articleimprovement for the forum
Hello, this forum is of little help in its actual form... plenty of questions, fews answers.. no doubt it is helpful, but it can be better organized.. I would like the results of a "filter by topic"...
View Articlehow to set wall to free stream boundary condition
I'm doing simulation of the heat transfer of Fuel Cell, I have an exhaust fan on the outlet and the inlet is the hole between the stacks, due to the thousand hole of it, i would like to draw a air hood...
View ArticleLater version of COMSOL has robuster and stabler solvers
Dear all, I just want to share my recent experience with a convergence problem. During last several weeks I was struggling with convergence problem. The model has two 2nd-order PDE and Electromagnetic...
View ArticleTheory of Brinkman equation
I'm checking the theory of the Brinkman equation in the manual. There's a term I don't understand where stems from: 2/3nu(nabla u). I also checked the given references but this term is not metioned....
View Articleout of memory during assembly
Hi All, I am running a heat transfer with radiation, and the error message says "out of memory during assembly". Rigth now, I am using a workstation with 48GB memory. I check the element number, and it...
View ArticleJoule heating on thin films
Hi everyone! I am struggling since quiet some time with a problem in joule heating in thin films. I have a resistor on a microscope glass slide and I am able to simulate Joule heating on the glass...
View Articleany other postprocessing software for COMSOL results
Hi All, Is there any other postproceesing software for COMSOL results, mainly for results by CFD module, Heat Transfer module? Thanks.
View ArticleElectric field lines
Hello, I wanted to visualize how the electric field lines develop between oppositely charged electrodes of various shapes. I had chosen electric current or electrostatics as my physics interface. Also...
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 ArticleHow to select Boundaries by coordinates/boxes WHILE building the geometry in...
Hello, I am trying to automate my COMSOL model via the LiveLink interface and I am struggling at the geometry part, where I need to transform all my boundaries into "solid". I tried the following:...
View Articlelaser drilling simulation in 2D
I have performed laser drilling in 2D and obtained transient temperature distribution . I am not getting some of the steps explained in this forum Request some guidance to move the laser source inside...
View ArticleResults - Density current
Hello, I'm current working in a 2D simulation of a conceptual motor and I need some help interpreting the results. I defined a copper conductor as the boundary of a cylinder of iron. The copper...
View ArticleCoefficient form PDE with Dirichlet boundary conditions - Problem with...
Hello, I have a Coefficient form PDE with Dirichlet boundary conditions with two dependent variables. The dependent variables range -5<v1<5 for v1 and 250<v2<600 for v2. The model converges...
View ArticleRadio frequency (and general) convergence question
I have a model which COMSOL is having a very difficult time finding a stationary solution for - the solver gets a fair way, but then tends to oscillate and never settles down to a converged solution....
View ArticleStress Strain Curve at different temperatures giving problem
Hello friends, I am trying to implement engineering stress-strain data obtained at various temperatures. Based on "temperature dependent plasticity" example model and "elastoplastic " example model i...
View ArticleInterpolating 3-D data
Hi all I am trying to use some 3-D data i.e. temperature profile across and x and y surface. The data is stored in and excel file. I want to interpolate the data to form a function as T = f(x,y) and...
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