tumor 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 ArticleHow to applicate a Magnetic field
Hello I'm beginner wuth Comsol and i wish to applicate a magnetic field into the metal structure of a surface acoustic wave sensor. Thank you for your help
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 ArticleSpatially-varying boundary condition (electric potential)
Hi all! I am using the Electrostatics package and need to define a surface with a linearly-varying electric potential that depends on one dimension of the model (e.g. V(x,y) = Kx). I tried to define a...
View Articleheat generation calculation
Hi, I am modelling microwave heating by Comsol 4.2 I used heat source domain and electromagnetic power loss density as heat source but I couldn't calculate heat generation terms (W/m^3) When I use...
View ArticleRectangular Pulse Train Creation
Hello, I am attempting to create a pulse train for my model. I am new to introducing pulses and would like an equation to place on my electrcial potential module to create the following: Rectangular...
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...
View Articlehow do I know if my license has live link to matlab
Would you please check my license and see if i have
View ArticleMultiple input ports in RF problems
Hello, I'am doing a simulation with RF module. It's about the mode analysis of a rectangular silicon waveguide. There are two waveguides. To propagate the monochromatic light of 1550nm (1.935e14 Hz ),...
View Articleprescribed dispacement
Hello, I'm trying to do a simple thing with structural mechanics module, but I don't get convergence. I attached the model. I'd like to apply a prescribed displacement at boundary 2 and check the...
View ArticleError to initialize a physics interface created with Physics Builder in...
Hi all, I am trying to compile with LiveLink for Matlab (Matlab version MATLAB_R2012a) a Comsol model (Comsol version COMSOL 4.3.0.151) that uses a physics interface which I created with the Physics...
View ArticleSurface tension as a variable
Hello all, I have a general question about surface tension in COMSOL. Can surface tension be assigned as a dependent variable? More importantly, can it vary in time AND space? Or be assigned as a...
View ArticleAC/DC Module Boundary Condition
I am currently working on a project to model a section view of a human forearm. The model terminates just before the elbow and the boundary condition there is a problem for me. I currently have the...
View ArticleVector operator expansion ∇·(c∇u) in 3D
hi I am working on a set of coupled differential equations in the equation based modeling (3D). Assuming that u=[u, v, w]. I am looking to evaluate the term ∇·(c∇u) to obtin the matrix c. I was...
View ArticleWeak form of Electric field , test(pzd.EX)
Hey all I am working in the 2D piezoelectric module and I want to take weak forms of Electric field in different direction, test(pzd.EX) and test(pzd.EY) but its showing error. When I try by making the...
View Article