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Particle Data Extraction
Hi there, I made a simulation of an electro-kinetic flow within a 2-phase medium, and after computing the currents I wanted to see how particles would behave within the geometry and the resulting...
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How to determine face numbers (using matlab livelink) associated with an object
Hello again, I am trying to 'automatically' set my boundary conditions for a model generated in matlab with livelink. I know which objects need to have which boundary conditions based on a draw order...
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Moving Mesh problem/ Electromagnetism / Induction heating of rod
Dear Ivar, I am working over a problem, induction heating of a rod moving inside the furnace with a certain velocity, required to relieve stress from the surface. The furnace is stationary, means the...
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Parameterise the position in a text file?
Hello, I want to use the 2D distribution of the relative permeability of a nonlinear calculation in a linear calculation of the same Model with same parameters etc. For that I export the data of the...
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Eigenfrequency seems right, but displacement units are totally wrong.
Dear Comsol Community, in the model attached I have a 20 micron long beam using the Solid Mechanics module to get the Eigenfrequencies. I calculated them manually using Euler-Beam theory and the first...
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How to assign a defined function to an electrode????
Hello Friends, Am working on AC/DC Module and new to comsol. Am trying to define a rectangular pulse of 1200v with a duration of 1ns to an electrode and i wish your kind assistance for the same. Thanks...
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Violating basic transformer equation
Hello all , I am doing simulation of two coil system with some gap between the coil , the problem is I defined the No.of turns in Multi turn coil domain and excited with voltage of 220 V , When i am...
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Unphysical solution with ellipsoid/sphere vs. hemisphere
Having a problem with COMSOL providing unphysical solutions when I use a sphere or ellipsoid "hovering" above the bottom of a domain as opposed to a hemisphere. I have a box, and within the box is a...
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S-Parameter in Complex format in COMSOL
I have not yet been able to find how COMSOL represent complex format of S-parameters. Can anybody please provide the correct format with reference? I am wondering if it is like S11=Re(S11)+j*Im(S11) or...
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2D electrostatic Force
Hi, I am modeling a slice of a simple comb capacitor in 2D. I would like to determine the force acting on the fingers. I can calculate the electric field, but when I try to determine the force through...
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Is the problem positive definite? Floquet periodic boundary conditions or PML...
Hello, I am doing some elastic wave simulations using solid mechanics module and piezoelectric module. And sometimes the DOF of my models are quite large so that I have to choose the solver manually to...
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How to rotate a 2D Plot?
I built a model with a 3D geometry. Unfortunately the created 2D plot (postprocessing), which is based on a cut plane, is rotated by 90°. Is it possible to rotate the 2D plot back by 90° or to exchange...
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voltage at different coordinates
Hello every one. it is possible in COMSOL to fine the voltage at (x,y,z) coordinates? thank you
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Undefined value found.
I am using poroelasticity module to simulate soil behavior of porous materials, the error information is as follows: Undefined value found. - Detail: Undefined value found in the stiffness matrix....
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Adding temperature varying with time
I want to enter temperature for calculating heat flux (temperature varies with time). Is there any method of entering the values? How can I use functions like interpolation, Rectangular etc,,,
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How to determine face numbers (using matlab livelink) associated with an object
Hello again, I am trying to 'automatically' set my boundary conditions for a model generated in matlab with livelink. I know which objects need to have which boundary conditions based on a draw order...
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Gas in Thermal Stress
I am trying to characterize a flaw in a structure (a hole filled with air) for a thermal stress simulation. From a structural point of view, the gas has a Young molulus of zero which cause the...
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COMSOL Error Message
Hi I've been problems with COMSOL in Plasma Module The following feature has encountered a problem:"The source selection for the operator intpot1 must be nonempty. Error in multiphysics compilation. -...
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Why COMSOL still requires the Young's modulus and Poisson ratio when defining...
Hi all, I want to play with Comsol for 3D simulations of linear elastic material. The materials are anisotropic so that I define elasticity matrices for them. But Comsol still requires me to give...
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Particle Data Extraction
Hi there, I made a simulation of an electro-kinetic flow within a 2-phase medium, and after computing the currents I wanted to see how particles would behave within the geometry and the resulting...
View Article