Extract data
Hello, I ran a Comsol program with parametric sweep. I want to extract data using MATLAB. How can I extract special data for all values of swept parameters. I can extract data for the first value of...
View ArticleSimulating Step index fiber in 3D
I am trying to simulate step-index fiber in 3D. But which physics i should add? In 2D model of comsol model library they added "Modal Analysis". But in 3D should i have to use "Boundary mode...
View ArticleOut of memory, solution does not converge, failed to find solution
I still try to solve my photovoltaics-model ;) I thought i might done something wrong and created a new model because i had that NaN/InF Error but well, it still doesnt solve it. To understand my...
View ArticleConcentric Cylinders Viscometer
hi everybody, We are a group of students and we are doing a viscometer with concentric ciylinders. We need to do a simulation of velocity in the time (depent time) and we have a problem with the...
View ArticleDe-icing of wing
Hi, I'm doing simulation of deicing of wing due to heating up sections of the leading edge of the wing. However, when I go through all the boundary set up and run the solution. I get an error:...
View Articlefloquet Boundary condition in PDE module
Hi everyone I'm trying to solve a boundary value problem in a periodic structure, I have to use PDE module to solve the coupling equations, and I need to impose floquet BC on two parallel boundaries on...
View ArticleWho has Comsol model of the Modeling Hysteresis Effects
HI everyone, I have a tutorial on Modeling Hysteresis Effects (in Comsol 3.5). Currently, I need this model for reference of hysteresis loss analysis. Anyone who has this please share the model here?...
View ArticleFinite Elements for Fluids P1+P1 P2+P1
Dear Comsol users, Comsol sets P1+P1 elements as default for laminar flow described by Navier-Stokes equations. As far as I know, theoretically, these elements are not good for such equations. Instead,...
View ArticleCOMSOL Multiphysics 4.3b is now available
Hello COMSOL Community! Five new modules and a tremendous number of new features and enhancements are ready to be applied in your models and simulations. Release Highlights are available at...
View Articleinternal error geometry decomposition
Hi everyone! I built a model in which 40 spheres are randomly placed in two cylinders and 4 spheres are fixed in the third cylinder. The problem is two errors are shown when i run the script:...
View ArticleMises or First-Principle-Stress for laminates?
Hi, someone told me that i should use the First-Principle-Stress- value für a laminate containing glass, polymers and silicon. The setting is: Glass - Polymer - Silicon - Polymer - Polymer 2-BEAM with...
View ArticlePleasse help me.
Good day. Would somebody be so kind as to send me a model ID 14191? Thank veri much. goodbye
View ArticleFind Inertial Modes, Eigenvalues for a Sphere of Fluid
I am new to Comsol and I am trying to find the eigenmodes of a rotating sphere filled with water in the rotating frame. I have specified the sphere filled with water with free slip walls, specified...
View ArticleApplying AC voltage
Hi all, I'm currently studying the electromechanical effects of a water droplet under AC/DC voltages. The water droplet is placed between two rectangular electrodes. I've applied a electric potential...
View Articlecomsol 4.0 how to have unequal scaling on different axes
In comsol 3.5a, i could selected under options->axes/grid settings the option that the axes not be equal. I have problems where dimension along one of the axis are microns while along the other axes...
View ArticleTransport of diluted species and electrostatics
Dear Community, I am trying to combine the physics of the poisson equation (electrostatics) with the nernst-planck (transport of diluted species) in Comsol 4.1 for like 6 weeks now, and all I get is...
View ArticleEigenvalue Calculations In RF Module With Perfectly Matched Layers: Radiation...
Hi everyone, I have one part general info that maybe others will find helpful, and one part question. Here goes: I've been trying to compute the eigenvalues of dielectric GaAs disk structures (embedded...
View ArticleHow to mesh finer in a specific area in 3D
My model is a insulator in 3D surroundded by air, i added a small water droplet on the insulator to observe the electric field enhancement around the water droplet. So i need to focus on the small...
View ArticleSplitting one Geometry in two
Hello, Iam a newy in working with comsol Multiphysics and would be very glad if I could find some help in this forum for my problem. I would like to define two different materials in one geometry. You...
View Articleparameter sweep error when loading a geometry
I am applying a load to the top of the geometry shown while the bottom is fixed but i keep getting an empty parameter sweep error can u help me??
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