Geometry Modification
Hi, I just want to know if there is an easy way for geometry modification in comsol. For example if I have done some simulation on a plate with a hole in it, and then I want to repeat the simulation on...
View ArticleMagnetic field
what does this expression mean and what does it do? mf.Forcez_Force_1 Thank you
View ArticleDealing with Periodic Boundary Conditions, PMLs and interfaces.
Hello, I'm trying to simulate a nanoparticle array over a substrate in order to study its extinction cross-section. To do so I've made a cell with periodic boundary conditions on the sides and two PMLs...
View ArticleGaussian focused beam, 4.2a
Dear All, I have issue. I have silver block on the glass. I want to illuminate it from the bottom (so light first propagate through the glass), but I want to illuminate it with Gauss focused beam (I do...
View ArticleModelling of infinite large seabed (with COMSOL 4.3)
Hi I'm conducting thermal calculations on a cable in the seabed (with COMSOL 4.3) using the Heat transfer module. I am modelling the seabed as a big square wherein the cable is placed. The upper...
View ArticleHow to avoid preordering in direct solvers
When Comsol solves the linear system Ax=B it applies an algorithm to reduce the bandwidth of the matrix A. Does someone know how to prevent this to happen? I'm using LiveLink and of course I'm aware...
View Articlerelative tolerance, order of integration 'gporder' , constraint order...
Hi, I hope that someone could help me. I am familiar with Comsol 3.4, but now I have started using comsol 4.2a I have 2 questions for comsol 4.2a. I use for my simulation a 'General PDE' 1 / how to...
View ArticleComposite 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 ArticleJob option in Batch command
Hi all, I add trouble when using the batch command recently. I prepared one file with a parametric study (different amplitudes are used in a time dependent problem). I didn't try yet the -pname and...
View ArticleWhere is the maximum (or minimum)?
Hello. Does anyone know how to find (not only represent) the coordinates of the max (min) value of a variable, for instance in 3D? I mean, when one plots 'Max/Min Volume' (in a 3D Plot Group / More...
View Articleparametric sweep with charged particle tracing
Hello, i have 2 studies in my model: 1) A study that calculates electric and magnetic fields 2) A study that calculates charged particle tracing only with the fields from 1) now i would like to...
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.
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