Composite material anisotropy
Hi, I'm enjoying a few days of trial licence and one capability I wanted to explore is modelling of composite lay-up structures, but I can't find an example model. The one discussion thread I found...
View Articletype of the solver
Hello, I'm simulating a flow in a 2D domain (a square wich contains a small hole). The governing equations are (N-S and mass conservation) and the boundary conditions are : - non slip BC (Dirichlet)...
View Articlecalculate stray capacitance for a 5-turn coil
Hello, I want to calculate the stray capacitance for a 5-turn coil. I use AC/DC module, 2D axisymmetry, stationary study and parametric sweep. There are two questions about this calculation: 1. When I...
View ArticleTransient analysis in COMSOL
When doing a transient analysis (Let’s say heat transfer or fluid flow), you may sometime need very small time step size, though you don’t need the solution for every time step. Recording the solution...
View Articledata export in v4.3
Hello together, due to a reconfiguration of my computer, I had to reinstall Comsol, which only is now available for me as v4.3. The calculations I did already are done in v3.5a. I am able to open the...
View Articleapplying same boundary condition to multiple selections
Hi, I am trying the following thing: Lets say there is a boundary condition, named "Ground1". I want to add 30 selections, defined arbitrarily, to "Ground1" BC. I am not able do this. To do so, I have...
View Articlephase dependent cuurent
hi all how can i induce some phase dependent currents in comsol? especially i wanna know how to make 3 currents with 120 degree different phase
View ArticleDefining MIXTURE of gases
hi friends i want to define a mixture of gases (iodine,xe,radon) at inlet each with different concentration for diffusion in the air . how can define mixture with different conc in comsol .
View ArticleMembrane Deflection ( Measure displacement)
Hi, I am very new to comsol. I have been trying a few simple models. I have a simple model of a membrane (2d axisymmetric, attache is an image). I just want to measure the displacement (maximum) from...
View Articleregarding coupling of physics
What is the difference between fully-coupled and weak-coupled. can any one explained through example by taking multiphysics problem.
View ArticleConvergence problem
Hello to all, I'm trying to simulate signal transfer through human arm. At the moment I'm facing convergence problem and I really don't know what to do. I tried to change model boundary conditions and...
View Articlepde_bimodular materials
Hi,I'm a Comsol newbie. I'm trying to create the model of a beam made of a bimodular composite material. Where the material is compressed(eg. d(w,x)<0) the elastic modulus Cbm will be...
View ArticleModelling and simulation of the ultrasound propagation at the interface...
Hello, I am trying to understand how Comsol works. I don't know to work with this program. I've received a homework and I am trying to model the ultrasound propagation at the interface deposited...
View ArticleUndefined value found in the stiffness matrix.
Hi I am Getting Following error when I am trying to solve Mosfet model in comsol Undefined value found. - Detail: Undefined value found in the stiffness matrix. .There are 9 equations giving NaN/Inf in...
View ArticleSimulation of a pull-out test giving error.
I am trying to verify the experimental results of a pull-out test using COMSOL 4.2 But I am getting errors. The geometry is as follows: A cavity is made in a cylinder made of concrete. Now a steel bolt...
View Articleinterpolation function
Hi, I have a problem with the interpolation function. I want to use a spatial (x,y) interpolation function for me conductivitu in the model. I import a spreadshit in the format of: % Description:...
View ArticleParticle tracing in COMSOL 4.2
Hi all! Does anybody have negative experiences with particle tracing in COMSOL 4.2 (and NOT 4.2a)? Because I do. COMSOL simply fails to trace small particles in even very simple situations. I placed a...
View ArticleMathematics Module: Coupled Simulation: How to access dependent variable at...
Hello! I want to couple a time dependent PDE with an ODE. The dependent variable of the PDE system is u1, the one for the ODE is v1. Now I want the value u1x(x_s) (i.e. the value of u1x at position...
View ArticleCircuit terminal question
Hi, All, I'm trying to build a model four terminal nodes. Two of them are COMSOL voltage (terminal 1) and ground (terminal 0), another two is connected to 'external' resistor which is not defined as...
View ArticleStop Joule heating and start cooling.
Hello, I am trying to simulate Joule heating model in Comsol multiphysycs heat transfer module. I want to use joule heating till the 19 sec. After 19 I want to stop JH and continue convective cooling...
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