Is there any good way to simulate a suqare inductor
Usually the circular inductor can be simplified as a 2D axisymmetric model in COMSOL, which means much less elements, DOF and memory cost. However, if we want to simulate a square inductor, does it...
View ArticleCOMSOL incapable to calculate static pressure in a confined fluid?
COMSOL incapable to calculate static pressure in confined a fluid volume and its interaction with the confining container walls both resulting from differing thermal expansions ? I'm a bit surprised,...
View ArticleError on convergence plot versus Relative Error
How exactly does the error that is shown on the convergence plot relate to the relative error needed for actual convergence? The plot seems to suggest that the current solution has an absolute error of...
View Article3D Mesh refinement within a domain
Sorry to ask such a basic question, but how do you refine the mesh for a specific region (not an entire domain) in 3D. I cannot get 'Mesh Control Domains' to work for me, but i think this would be...
View ArticleElectric Displacement Field due to mechanical stress after cooldown
Dear Comsol users, I have a problem with a 3D simulation for my Ph.D. thesis. Therefore I would be very grateful if anyone could help me. My model consists of a piezoelectric substrate, two insulating...
View ArticleI really dont understand...... Help me..
when i imported a geometry file in comsol. that file is STL, VRML fomat. But both of them is strange when COMSOL is imported that. when i checked that files in another program such as ANSYS, Solidworks...
View ArticleHELP!!! how to find stress matrix of a 2D rectangle of Gallium Nitride
Hello everyone, i am doing some research on pizoelectric effect on Gallium nitride, but i faced a huge problem that i have not the complete data of Gallium Nitride which comsol required to entry to...
View ArticleMEMS RESONATOR 3D: Failed to find a solution. In segregated group 3:...
Hi everybody, I am trying to run the stationary model for a MEMS disk connected to a bar in order to obtain the initial conditions (pre-stress, displacement) to include in the modal and harmonics...
View ArticleRigid connector as rotation sensor
Hello, I'm trying to use the rigid connector as an angle sensor, but I'm having troubles interpreting the values. In my case I have a 3D solid mechanics simulation of an object, and I apply a rigid...
View ArticleAnimating the principal strain components on a membrane
I am trying to animate the surface plot of principal strain components for a circular membrane, as the oscillation phase varies. However, I get a message saying that there was an error evaluating the...
View Articlerelative permeability as a function of temperature and magnetic field in...
I am doing induction heating simulation and i want to define relative permeability as function of temperature T and magnetic field H as mur(H,T). I have an expression which correlates the relative...
View ArticleCOMSOL 4.4 under Ubuntu 12.04: problem with command keys
Using COMSOL Desktop under Ubuntu 12.04 Certain keys on the keyboard are directly linked to menu commands. For instance, when I hit the 's' key in a text field, COMSOL automatically does the "Save"...
View Articlesummation
Hi, I want to calculate the numerical error from a PDE solution. To do that, I need to do a summation, since the analytical solution is represented with a summation. I don't know how to represent it...
View ArticleDefining a parameter/variable/function that varies along a cutline on a 2D...
Hi all, I need to implement a boundary condition that will change as it's being applied. I'm not sure if this is possible, but it seems like it should be. Specifically, I'm using the Poisson's equation...
View ArticleTransmition Coefficientof Electromagnetic Wave in Frequency Domain
Hi, I am doing a simulation of free space. My Comsol version is 4.1 My goal is to find transmission and reflection coefficients in order to determine phase of reflection or transmission. I know how to...
View ArticleHow do we generate report on a 3D modeled project? a kind of technical report?
Hi, Generally what are to be mentioned/written in brief technical report of the designed project? Thanks for the help. S
View Articledistributed impedance
Hi! how to place FLOATING distributed impedance layer? the object asks to specify the reference voltage that it is connected to, but I want to keep it floating. best regards, Michal Radziwon
View ArticleHow to calculate resistive (ohmic) losses ? AC/DC E&M Fields 2D
Hallo everybody I'm trying to calculate resistive losses on a coaxial cable for a parametric sweep, my model is excited in two ways: density current and Voltage(Va) by means of single turn coil, in...
View Articlesimulate a suqare inductor
Hi, i'm new in Comsol and I want to simulate a square inductor, firstly I used a external current density in Magnetic field Module i get the magnetic field is near to the theorattical MF but the...
View ArticleConjugate heat transfer in shell and tube heat exchanger
Hi All, I am solving conjugate heat transfer problem in shell and tube heat exchanger. In the inner tube the Heat Transfer Fluid (HTF) is flowing with laminar flow with constant temperature. Whereas,...
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