Defining integration line for mutual coupling calc in IPT simulation
Hi, I am trying to simulate an inductive power transfer system with two coils. Secondary coil located above the primary one with a large air gap. I have found the examples of concentric coils and in...
View ArticleMagnetic field distribution of moving current path
Hello, i'am also a beginner with COMSOL and my free trial period has just ended. My question is, is COMSOL capable of calculating the current distribution and the magnetic field distribution of a...
View Articlecomsol server matlab, log file
Hello, I am running a comsol *.m file in a Matlab window. I would like to know how to create a log file in order to see the time solver progress . Thanks Francois
View ArticleError while solving Joule heating: mesh-case 0 there are 665 void equations...
Hi, I tried to simulate joule heating in a copper cylindrical wire with an cylindrical air-void in it. But I am getting following error: Failed to find a solution. Singular matrix. For mesh-case 0...
View ArticleCOMSOL 4.3b crashes suddenly
Hello all, I've been using the software without problem for about a week. Recently a model I was running (using solid mechanics physics) was taking too long because I had too fine a mesh. I tried...
View ArticleDefining a porous electrode
Hi, I want to model an electrode containing a foam based current collector onto which the electrode active material is pasted. In this case both the media, i.e the current collector and the active...
View ArticleIntegration coupling for prediscribed displacement variable
Hi, For my graduation project I am currently modeling the lymphatic primary valve. The model consists of two overlapping lymphatic endothelial cells, poroelastic extracellular matrix on the left (poro)...
View Articlefrequency response analysis
Hi, I am trying to do a frequency response analysis of a solid mechanics problem in frequency domain. There is a boundary load which is sin(w*t), I defined w and t as parameters. W should rotate, so I...
View ArticleMaterial property dependent on solution variable
Hi, I'm trying to solve a 1D flow problem with Darcy's Law. The permeability of my material is supposed to be dependent on the pressure gradient in the medium. So I would first have to create a study...
View ArticleMaterial property dependent on solution variable
Hi, I'm trying to solve a 1D flow problem with Darcy's Law. The permeability of my material is supposed to be dependent on the pressure gradient in the medium. So I would first have to create a study...
View ArticleMaterial property dependent on solution variable
Hi, I'm trying to solve a 1D flow problem with Darcy's Law. The permeability of my material is supposed to be dependent on the pressure gradient in the medium. So I would first have to create a study...
View ArticleShear Periodic or Lees-Edwards Boundary Conditions
I'm wondering if and how I could implement the following boundary conditions in COMSOL: at point (x,y), f(x,y) = f(x+Nx*L+Ny*gamma*L, y+Ny*L), where Nx, Ny are arbitrary integers, and gamma and L are...
View Articleno convergence for cylinder under external pressure
I have a 2D model of a cylinder tube. External pressure acts on the outer wall of the cylinder, a different pressure on the inner wall. The analysis does not converge: I get an error message:"Failed to...
View Article"Conjugate Heat transfer" failed to converge if a fluid is included.
A cylinder with a cavity filled with water is the geometry. At the beginning, the outer wall hast a temperature different from the contents."Conjugate Heat transfer" is used to model the thermal...
View ArticleMass density and bulk modulus
Hi, I want to model an 2D acoustic metamaterial in Comsol. My target is to apply acoustic waves along one side of the geometry and calculate the wave amplitude from opposite face of the geometry. I...
View ArticleOscillations of E/H inside a sphere bounded with a PML
Hello, I have some results but I'm not confident if they are correct. I am simulating an antenna which should generate very strong electric field, and I want to test it at the frequency of 200MHz...
View ArticleUsing symmetry with PML in RF Module
Hello, My question is about possibility to utilize a symmetry in cases like in dipole antenna. The example model of halfwave dipole antenna from COMSOL models it without taking any symmetry into...
View ArticleInitial values - how to input vector rather than constant?
I'm using 1D General Form PDE to solve some coupled PDEs. I have set up the PDEs and boundary conditions. Now I have to set up initial conditions. Say I have 5 mesh points. Then for a particular...
View ArticleDrag coefficient
What is the best way to compute the drag coefficient of a profile in a free flow in 2D axisymetric? And why do I obtain 2 differents solutions by computing the Cd with the integer of total stress over...
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