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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
HelloI 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...
View ArticleModelling Gaussian beam with lens
Hi. Could you please provide me with some examples of how to model Gaussian beam propagation in 3D and in particular propagation throughout the lens?
View ArticleWeak form PDE in comsol
Hi. I studied the blog for applying the neuman boundary contion in one dimension. The blog link is https://cn.comsol.com/blogs/implementing-the-weak-form-in-comsol-multiphysics/but i am facing problem...
View ArticleNeed to set a Boundary condition
Hello,I am using the Transport of Diluted Species module for my simulation. I need to set an initial concentration value at a boundary. I dont want that value to be fixed. I just need it to be the...
View ArticleRadiation in participation media and LTNE - an energy balance problem
Hello everyone,I have a model of porous media (with local thermal non-equilibrium) attached to a solid domain. I am considering porous media as a participating medium using P1 approximation. But I have...
View ArticleOutput of getVertexElements()
Hi Everyone,I am trying to extract results at the gauss points of tri elements. The problem is: I am having trouble assigning each gauss point to its corresponding element. A snapshot from my code in...
View ArticleSubsurface Flow with Darcy´s Law in a saturated Grout Sample
Hey Everbody,I have a problem with my hydrodynamic model in Comsol Multiphysics 5.1. I want to simulate the hydraulic conductivity in a saturated Grout sample, where a HD-PE Pipe is centered. I attach...
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