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Calculating Electrostatic Force without MEMS Module

I've been having difficulty coupling the Electrostatics/Structural Mechanics/Moving Mesh applications. I was previously given advice to look up the MEMS 3D Cantilever Beam model to help me understand...

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importing txt file to create geometry in comsol 4.0a

hi can i create a geometry by importing coordinate data existing in a text file in comsol4.0a? suppose i am having (x,y) data in a text file and i want to use this data for creating geometry in...

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How to loop simulations in Comsol 4.2a with Matlab

Dear comsolers, here is an example on how to loop simulations. I'll let you decode it. 'Preprocessing' that I did before the loop: 1. Build a model in Comsol (attached). 2. Save As Model M-File...

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Metal film with subwavelength size hole: Transmmittance and reflectance study

Hi I'm novice in comsol RF simulation. I'm trying to simulate transmittace and reflectance throught metal film with subwavelength size hole. My structure will consists of Air/metal/semiconductor...

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How to use parameters between different physics?

Hello, my name is Wang Jiujiang from University of Macau. I am using COMSOL to simulate a capacitor, after I simulated using DC voltage, I want to add AC voltage. After I add a physics--circuit and...

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Microwave oven waveguide configuration

Hi everybody, I am trying to simulate a microwave oven using COMSOL, but I'm still a bit confused about configuring the waveguide. What is the difference between Transverse Electric (TE) and Transverse...

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Error in compile Equation: Frequency Domain

Hello everybody, I am simulating a microwave devise in optical frequencies but I see this error: Feature: Compile Equations: Frequency Domain (sol1/st1) Error: error in multiphysics compilation I would...

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How to use interpolation function in parameters?

Dear users, I have defined a piecewise function from a file with function name 'functionName' in Global Variables. I would like to define a parameter that uses this function in Global Definitions ->...

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Compressible laminar flow & Transport of diluited species: why there is no...

Hi everyone, I have to model the transport of a chemical species dissolved in a gas mixture during an expansion of the gas. I simulated a time-dependent gas expansion due to a reduction of pressure in...

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Convergence issue with nano pore electrodeposition model

I am trying to model electrodeposition into a nanopores but am having troubles with convergence. My solution only converges to 1e3 fairly consistently even if I refine the mesh and then it starts to...

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CFD - Surface roughness

Hey guys I really need your help on this one! I was wondering if any of you could tell me about the default settings of surface roughness's in COMSOL? All I've found about it in the documentation is...

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When I have to use 2d or 3d modeling?

Hi Everybody! I´m Wagner, from Brazil and I have a question, a simple question I think! How I decide if my modeling will be in 2d or in 3d? I have Heat Transfer and AC/DC model and I work calculating...

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Variable change with time

I have a question about variable change with time. I try to make a mass transfer model. The inflow concentration change with time. If t <= 1000s then C=1mol/m^3 else C=0 I upload the data and make a...

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Structural Mechanics Equation System

I am trying to understand how my structural mechanics model is computing its solution. The model solves and gives me a reasonable solution. However, I don't understand how it is arriving at its answer....

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Electromagnetic Induction Tomography simple model

Hi, I am trying to make a very simple 2D model where I have 2 coils in which in between is a medium (air). One of these coils will be excited and have a magnetic field in the direction of the second...

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Heat Transfer in Fins- Help needed

I am trying to simulate a heat sink, very similar to the one shown in the tutorials... In spite of building a coarse mesh, the solution does'nt converge even after 2 hours of solving. I have an i5...

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How can I define nonlinear electric conductivity ?

Hi, I'm currently working on electrical simulation using AC/DC module. How can I define nonlinear electric conductivity of zinc oxide (ZnO) in subdomain settings?

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Problems with multicore time calculation

Hello everyone, I am working with the attached file and there is a very unusual behavior with the second study. It is a frequency response study with a parametric sweep: I need to know the frequency...

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for NdFeB magnet, which constitutive relation is closer to reality

I'm modeling two NdFeB magnets placed very close to each other in a repulsive manner. I need to compute the repelling force between them. There are two options for the constitutive relation. One is B =...

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