generating the graph
I am designing a model of saw resonator and i want to see the admittance vs frequency graph but i dont know how to generate this graph , i am new to comsol . please help.
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 Articlesilencer duct
Hi I want to simulate insertion loss for ventilation ducts. I need to define inlet and outlet pressure so i can calculate insertion loss by its difference. There is a similar sample "perforated...
View ArticleUniform Magnetic field?
Hi everyone, I am wondering how I can generate a uniform magnetic field in Comsol. Basically, I want to simulate a metal particle moving in this uniform field. Now I am thinking put all the particles...
View ArticleTotal 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...
View ArticleError: 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...
View ArticleAC 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...
View ArticleVoltage Induced in a Coil by Moving Magnet
Hi, I am trying to learn how to use moving mesh. And I created a project same as "Voltage Induced in a Coil by Moving Magnet", which can be found in Comsol website. But the problem is: when I run it,...
View ArticleHow 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...
View ArticleHow 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-...
View Articleapplying 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 ArticlePoint 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...
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...
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