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Point Evaluation using Biot-Savart Law.

Hello everyone, I am currently attempting to do a point evaluation with the expression for Biot-Savart Law. The set up is like this: I have an array of points that I would like to get the value at...

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De-icing of a wing

Hi, I'm new to COMSOL so please excuse me if my questions seem weird. I'm trying to simulate deicing method used on airplane wings. Right now I'm going for the most simple approach and geometry. So...

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Total magnetic Energy

Hello, im Using COMSOL 4.1 and I have got heavy problems simulating the cogging of a synchronous machine. The calculated Torque using the stress tensor is correct. But if I use the method of virtual...

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Error: Internal error: cannot convert ElemStruct to int.

Hello, last week I got a new computer (Windows 7 system) and just tried to run my Comsol models and an error occurs. Whenever I try to run the study I get the following error: Error in sweep: The...

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AC field Simulation

Hi, I have to do a simple Simulation in comsol multiphysics 4.1 and i am just a beginner in this work,i have to build an electrode geometry and apply various frequency and voltage ac signals and see...

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How to define variable regard to time dependent steps?

Hello All I'm running a time dependent AC/DC model, The conductivity of material must be changed regards to voltage differences on two coordinate in each step . I wonder How can I define a variable or...

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How to set boundaries as continuity ?

I want set the boundary as a continuity but I don't know how? I know that in Comsol by default the boundaries are define as continuity and it follow this equation: n.j=0 but I want change it to n(j1-...

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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...

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Ionization 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...

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Induction 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...

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what 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...

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Electrostatics: 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...

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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...

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Simulating 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...

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Out 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...

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Concentric 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...

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De-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:...

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floquet 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...

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comsol 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...

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Who 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?...

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