Laser heating of Sphere
I'm currently attempting to model a spherical object that is being heated by a laser. I have defined the laser using a gaussian pulse with the function for the heat flux being: plaser*gp1(x)*gp1(y)...
View ArticleCombining different variables into one
Hello all, i am quite new in the COMSOL world so i dont know all the possibilities that go with it and i would like to know if somebody can tell me how to combine expressions for different time steps...
View ArticleProblem with interpolation function and variable
Hi ! I'm a beginner in COMSOL 4.2a and I'm trying to simulate a model using the Microwave Heating interface. I have to consider the temperature dependance for the thermal conductivity and the...
View ArticleAnisotropic Diffusion
Hi, I have a 2D geometry in which I want to define anisotropic diffusion. When I select this option in the menu and solve the problem I get weird results. When I check again the options, 'anisotropic...
View Articleheat transfer and laminar flow
Hi I am trying to model the flow of liquid metal(Al-Si alloy) inside casting die and the eventual solidified product at the end of the die. I am not sure whether to use conjugate heat transfer here....
View ArticleFluid Structure Interaction -- Convergence Problem
Hello, I am working with the FSI module and I am trying to model an oscillating plate in an infinite expanse of fluid. I have successfully used the "sliding wall" boundary condition to do this, but...
View ArticleSetting the permittivity of particles for dielectrophoretic force in Particle...
Hello, I encountered a problem while setting up fluid model with DEP force. Direction of DEP force is dependent on the Claussius-Mossoti factor, i.e. complex permittivity of the particles and the...
View ArticleFailed to evaluate variable Jacobian.
Hi all! I'm a new user of Comsol. What I'm trying to do is to make a simple model (3D) in which there's a moving magnet placed under a spiral inductor and i want to see the induced voltage across the...
View ArticleGeneral PDE equation
I need to implement the tumor growth mathematically using General PDE equation. It would be great if you let me know is it possible to write my equation for source (f) at General PDE equation. if it...
View ArticleElectrical Circuit in Electrostatic Simulation
Hello! Is it possible to have a electrical circuit problem connected with an electrostatics problem? For example I want to connect a capacitor with a certain value to my electrostatics simulation. If...
View ArticleWhat is the motivation of new Nonlinear Structural Materials Modele in Comsol...
In my opinion Comsol Multyphysics was a tool for all. However, I am disappointed by the new Nonlinear Structural Materials Module. Since in earlier versions, comsol had already nonlinear material...
View ArticleMixture Three different liquids
Hi All, I'm new to COMSOL Chemistry model and I'm trying to simulated an interdigitated capacitor crossed by a fluid composed of three different liquid (Gasoline, Water and Ethanol). How i can simulate...
View ArticleComsol does not finish the calculation even though convergence criteria is...
Hi, I have a rather strange problem with COMOL and hope that anyone can help me. I am trying to solve a "free and porous media flow" on a 3d geometry. The calculation is not converging very well but it...
View ArticleConvergence in two-way coupled mass transfer
Dear all, I am trying to solve the concentration profile in a multiscale non-steady state two-way couple mass transfer problem (specifically, an extractor). This is as follows: Concentration at the bed...
View ArticleUsing 3D model data as input for 2D model
Hi Everyone! I have a 3D model with coupled flow and electro-chemistry equations. The equations are weakly coupled, so I know from previous experience that I can run the flow and electro-chemistry...
View ArticleDifferent results of Simulation from Solid Mechanics and shell
Hello, I have a problem when doing a simulation with a bend pipe meshed by shell element. The results of principal strains are one time larger than meshed by solid mechanics. But the results of...
View Articleelectrode - voltage response to remote current
Hello, I am trying to do a test on a probe with some electrodes in it. I am trying to have a current at a point 100 um away from the probe and record the voltage at the electrode. I have built the...
View ArticleFrequency Response Analysis
Good Evening, In my simulations I'd like to excite my object with a known force throughout a certain frequency range then have a FRF Graph of it with Frequency on the x axis and the Acceleration/Force...
View ArticleAdd a specific rectangular surface as data set for post-process inside 3D...
Hello all, Currently I am trying to add a rectangular surface as a data set inside my 3D geometry for the post-analysis. The four vertex of my rectangular surface has coordinate (x,y,z) provided as...
View ArticleResult is triangular, should be cosine wave
Hello all, i am trying to simulate magnetic flux induced by a multi-turn coil with current as coil excitation. Now that should be no problem but i want to do it in the time domain for a couple of...
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