COMSOL Error for Initial Values(RF Module)
I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...
View ArticlePhotonic crystal fiber
I am trying to model a photonic crystal fiber with liquid crystal filled holes.. I am a starter and it would be really helpful if any one can help me regarding the resources from where i can learn the...
View ArticleThermal expansion model
I am trying to examine the stress distribution in a SiO2 film coated on a thick Si sample with a small Al bump on it, all heated to 700 K. I thought I built the model correctly, but the resulting...
View ArticleFinite Elements for Fluids P1+P1 P2+P1
Dear Comsol users, Comsol sets P1+P1 elements as default for laminar flow described by Navier-Stokes equations. As far as I know, theoretically, these elements are not good for such equations. Instead,...
View ArticleVoltage Induced in a Coil by Moving Magnet
Hi, I am trying to learn how to use moving mesh. And I created a project same as "Voltage Induced in a Coil by Moving Magnet", which can be found in Comsol website. But the problem is: when I run it,...
View ArticleUsing a Gaussian Pulse
Hi everyone, I'm actuallay working on a modeling of a laser pulse which is heating a front of a material in order to determinate the diffusivity, my current issue is that i would like to model my heat...
View ArticleStore data at certain time intervals
How do I set up my model so the data are not stored at every time step, but at certain intervals. That way I don't end up with huge file, and my plot files for exporting are small as well. Thanks in...
View Articlemanaging plots
Is there a way to stop refreshing a plot? I mean, if you realize that you're plotting something wrong, can you give some command to stop the plot immediately? -- Mr. Ezio Cosatto Ansaldo Energia S.p.A....
View ArticleMesh Swept Problem
Dear All, I need to reduce the elements of the mesh in the fluid domain. At the beginning I used a tetrahedral mesh but it is too dense in the axial direction, while I need it mainly in radial...
View ArticleHow I can shrink or expand my simulation box?
Hi all, I have a simulation box to simulate a special form of the diffusion problem (I have my own PDE). I have only one field say density "ro" which varies during the simulation in the box. I want to...
View ArticleCOMSOL Multiphysics 4.3b is now available
Hello COMSOL Community! Five new modules and a tremendous number of new features and enhancements are ready to be applied in your models and simulations. Release Highlights are available at...
View ArticleFuel cell modelling - Electrolyte selectivity issue
I started to model a micro Direct Methanol Fuel Cell (DMFC) with the reference of existing PEMFC model given in the model library. I am using Comsol 4.2a. Since I designed my model as like as the given...
View ArticleError: 2035 Edges are too close in 2D domain
I am simulating electric field distribution between two electrode that are spaced 250microns away. One of the electrodes have a thin dielectric layer (200nm) with a hole of 1micron diameter. I am...
View ArticlePoint Evaluation using Biot-Savart Law.
Hello everyone, I am currently attempting to do a point evaluation with the expression for Biot-Savart Law. The set up is like this: I have an array of points that I would like to get the value at...
View ArticleDe-icing of a wing
Hi, I'm new to COMSOL so please excuse me if my questions seem weird. I'm trying to simulate deicing method used on airplane wings. Right now I'm going for the most simple approach and geometry. So...
View ArticleTotal magnetic Energy
Hello, im Using COMSOL 4.1 and I have got heavy problems simulating the cogging of a synchronous machine. The calculated Torque using the stress tensor is correct. But if I use the method of virtual...
View ArticleError: Internal error: cannot convert ElemStruct to int.
Hello, last week I got a new computer (Windows 7 system) and just tried to run my Comsol models and an error occurs. Whenever I try to run the study I get the following error: Error in sweep: The...
View ArticleAC field Simulation
Hi, I have to do a simple Simulation in comsol multiphysics 4.1 and i am just a beginner in this work,i have to build an electrode geometry and apply various frequency and voltage ac signals and see...
View ArticleHow to define variable regard to time dependent steps?
Hello All I'm running a time dependent AC/DC model, The conductivity of material must be changed regards to voltage differences on two coordinate in each step . I wonder How can I define a variable or...
View ArticleHow to set boundaries as continuity ?
I want set the boundary as a continuity but I don't know how? I know that in Comsol by default the boundaries are define as continuity and it follow this equation: n.j=0 but I want change it to n(j1-...
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