Now Available - COMSOL Multiphysics® 5.4 – Faster solvers, new modeling...
Hello,I'm pleased to announce that COMSOL Multiphysics® 5.4 is now available. For details, visit: www.comsol.com/release/5.4Release highlights:COMSOL Compiler: For creating standalone executable...
View ArticleHelp with meshing
Hello, I am trying to replicate the results from a paper. I am having problems with the mesh. I have attached a photo with the geometry and a description for the mesh.
View ArticleRelative error exceeding tolerance in periodic structure
Hello,I am building a hexagonal periodic structure excited by an incident plane wave using the Comsol RF module, which I am attempting to simulate through a series of parametric sweeps. Unfortunately,...
View ArticleRunning electro thermal deformation study on a prestressed micromirror
Looking at the prestressed micromirror example I'd like to know how it is possible to run current on the resulting stressed model and observing angle change of the mirror depending on current/heat...
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View ArticleNeed to modify Equation(Transport of Diluted Species)
Hello, I am currently doing a research project and I need to modify an equation. I want the 'R' value on the right hand side to be 0.I have attached a photo with the equation I need to modify.
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Trying to add LASER radiation source to a 3D model
Hello, i have a 3D model of the human eye, i'm trying to add a LASER source and to examine the heating distribution, i added materials for each domain such as absorption and scattering coefficients,...
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Heat transfer equation in PDE Comsol
In the heat transfer equation as attached file, it exits a part: rho x cb x omegab x (T-Tb)However, in Coeffient form PDE equation, only has part aT. Then a = rho x cb x omegab Could you help me to do...
View Articleelectrostatic Force Calculation
Dear Friends, I really need to know how to calculate electrostatic force on the plates of a capacitor. While I am moving the plates closer, the electrostatic force changes but the force on any point...
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Pure imaginary eigen frequncy in high aspect ratio 3D beam
Hello I am lately working with 3D-solid mechanics-Eigen Frequncies. I have problems with simulation when the aspect ratio of the 3D beam is really high. 3D beam is composed of 3 layers gold(0.04 m...
View ArticleSimulation shows this result, why is this?
Some particles have been removed from the simulation due to the maximum number of wall interactions in a time step.
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Implementatation of Neuman boundary conditions
Dear all. I am solving naveir Stokes equations for elliptical shape bubble flow in fluid. I applied my neuman boundary conditions and I got equations in which the the Neuman BC in weak form (equation...
View ArticleOn Simulation of EHD Printing
HI, Question is that :- I want to perform a simulation of EHD printing but do not know how to define the forces namely Fx and Fy. Please suggest me how to deal with it? Also I want to apply a biased...
View ArticleError Due to Singularity
Hi, i am trying to simulate thermal runaway in a cell. During this phenomenon the temperature goes up very quickly like from 400 to 1200 in a single second. Due to this high temperature rise the comsol...
View ArticleBoundary mode analysis of asymmetric waveguide
Hello I am working on Silicon based polarisation rotator which is basically a coupler.The structure is asymmetric waveguide comprise of silicon slot and strip waveguide.Now i am facing difficulty in...
View ArticleModifying the wave equation in the wave optics module
Hello everyone,In the wave optics module, frequency domain, modal analysis, I need to modify the wave equation. The default wave equation is the following:∇×∇×E - ε k0^2 E = 0λ = -jβ - δzE(x,y,z) =...
View ArticleHow to define a PDE form of a source term including an unknown variable in...
Hello everyone,My problem include "free flow" and "porous flow" domains for which I am going to consider transport of chemical species. In the convection-diffusion equation for the porous flow, The...
View Articleweak form pde
Hi all. Please can some one give an example, how we can write a pde in weak form which have three dependent variables. I do not know how I can write the stokes equations in weak form using comsol. The...
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