Unsteady Analysis
Hi, I am solving unsteady state navier stokes equation with a volume force term. My volume force term contains a term like sin(t), now i want to make sure that the unit of angle in comsol is radians,...
View ArticleUnsteady Analysis
Hi, I am solving unsteady state navier stokes equation with a volume force term. My volume force term contains a term like sin(t), now i want to make sure that the unit of angle in comsol is radians,...
View Articleerror in model library
Hi, guys. I am learm a model in model library , the name is "domain_activation_llmatlab.mph". I am doing the example step by step, but at last I find that i can't run the matlab code. There is a error...
View Articleerror in model library
Hi, guys. I am learm a model in model library , the name is "domain_activation_llmatlab.mph". I am doing the example step by step, but at last I find that i can't run the matlab code. There is a error...
View Articlecombination of convection and conduction help
Hello I want to analyze flat plate and air around the plate. Laser make heat on the plate. Air gun shot the plate for cooling. It happens in a big hexahedron. Above all, I want to know how to analyze...
View ArticleNonlinear free vibrations of beam(2D)
Hi I need to model free vibrations of beam with geometric nonlinearity rho*d2u/dt2 = A(u) where A - nonlinear operator, with some boundary conditions. Basically this problem is reduced to eigenvalue...
View ArticleComplex permittivity in electric currents physics
This seems like a simple question but I can't find a clear answer in the documentation. I wish to solve for the electric field induced by a conductive particle surrounded by an insulating membrane in...
View ArticleBoundary conditions in Equation-Based Modeling
I am trying to solve a set of three "Helmholtz-type" equations using the Equation-Based Modeling of Comsol. There are three independent variables, call them u1, u2, and u3. The equations are (with some...
View Articletumor ablation model
hello, i am trying to make a model like" tumor ablation" model in comsol Heat Transfer Module but i want to change the current from DC to AC current and i want to plot the electric field distribution,...
View ArticleSimulation of a floor heating
Hi all, I want to simulate a floor heating in a 2D modell. Floor heating systems release about 90 % of heat in the form of radiation and about 10 % in the form of convection. So is it possible to take...
View ArticleCalculating EM Force in the Electromagnetic Waves (emw) Environment
Hi, This should be a very straightforward question. I would like to calculate the time-averaged electromagnetic force (via integrating the Maxwell Stress tensor over a surface). The fields that I need...
View ArticleUsing external file data for heat source
Hi all, I am trying to solve a model for heat transfer in solids using external data as heat source input. The geometric model is simple and composed of 3 separated bodies attached together by a...
View Articlephase transformation
hi everyone, I'm looking to modelize a phase transformation in the Titanium alloy ti-6AL-4V during the course of the beta-phase to alpha-phase. I'm not sure if Comsol can do that or not. If the...
View ArticleUnsteady Analysis
Hi, I am solving a unsteady state problem, in which i need to solve two unsteady equations. The solution of first unsteady state equation, which depends on time, is used in solving the second unsteady...
View Articleparticle tracing
Hello everyone, I have a problem with the particle tracing module: I want to evaluate mixing performance of a mixer. how I can define four part at rotating machinery and then define unique particle...
View Articlemodeling electric current
Hi I need to obtain the electric current density field in a medium attributed to a pair of source and sink electrodes with known current. what physic should I choose and what boundary conditions...
View Articleelectric currents model
Hallo, i have a question about the electric currents model. My simulation is 2D axisymmetric in frequency domain. The geometry is a solenoid which has two turns. As you know, if the current flows...
View ArticleHow to realize moving boundary integration in COMSOL?
This is a math problem in calculating the photo-ionization of streamer discharge by comsol. The 1-d calculation domain is (0,d), and one point inside this domain is x. We need do the calculation in two...
View ArticleProblem related to imported mesh file
I was trying to import a mesh flle (mphtxt) file from Simpleware Scan FE software. However when I import this mesh file in COMSOL and throw all the physics on it, following error appear : Can you...
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