applying a periodic biphasic square waveform to a surface electrode
Dear friends, I want to apply an AC voltage/Current to a surface electrode placed on the human skin. I need a periodic waveform with unequal on and off time. How can I apply this stimulation pulse to a...
View ArticleIonization of air.
Hello. I have a model that comprises a container filled with air. From the outside there are two coils number of turns 1e6 supply current is 1e3 A in the container are two electrodes voltage + - + e7 V...
View ArticleInduction heating
Hi to all! I'm getting some trouble about induction heating using frequency-transient solver. In the 2D-axisymmetric model, I have an aluminium workpiece surrounded by 12 turn of coil (each one setted...
View Articlewhat is "circular dependency " error?
Dear All I,m doing simulation partial discharge by Comsol and Matlab but during simulation I faced this problem, I would be thankful if any one help me for solve this problem. I set two probs under...
View ArticleElectrostatics: relative permittivity
Hi, I am solving an electrostatics model which includes conducting and insulating material. What is the relative permittivity value of conducting material used? All the in built materials use the value...
View ArticleExtract 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 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 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 Articlemanaging plots
Is there a way to stop refreshing a plot? I mean, if you realize that you're plotting something wrong, can you give some command to stop the plot immediately? -- Mr. Ezio Cosatto Ansaldo Energia S.p.A....
View ArticleMesh Swept Problem
Dear All, I need to reduce the elements of the mesh in the fluid domain. At the beginning I used a tetrahedral mesh but it is too dense in the axial direction, while I need it mainly in radial...
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
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