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Concetration should decrease when heating up a gas?

Hi, I´m modelling a gas that initially is entering to my geometry, with a given velocity, at a fixed concetration of H2 and at 25°C. In this geometry there is a barrier that is at 1100°C that is in...

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fluid structure interaction

Hi , I'm facing a problem with FSI module . for the model in micro fluids library ( obstacle in fluid ) the dimensions are in microns , when increase the dimensions in Cm ( only scaling the model ) ,...

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the result of building half model to modal ansys(or eigenfrequency ansys ) is...

I build two models to modal ansys, one is half model and the other is whole model(the model is symmetrical),but the results i got is different. frist , the number of whole model`s modal Shape under...

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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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Heat Pipe on a Heatsink

I watched the tutorial for Heatsink Analysis. I was wondering if we can develop the model by adding a heat pipe. I was told that it needs to be developed as a porous region but how the -thermodynamic...

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Meshing

Hello, I"m looking for good tutorials for showing the method of "user controlled mesh". I cannot find any good tutorial in COMSOL. Please let me know. Thanks.

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Piezoresistive modeling

Hello all I want to simulate a piezoresistive beam with Comsol. I was looking to find an example of piezoresistive modeling to find out what module they usually use and how are the settings but i...

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Convergence problem of contact mechanics

Hello, Following the earlier discussions on implementing an algebraic equation into a structural mechanics model, I fortunately got away with writing out explicitly an analytical solution. Thanks a lot...

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PDE - Contact Resistance

Hi Everyone, I am wondering how to implement electrical or thermal contact resistance when using the PDE physics. I am using the PDE coefficient form to model thermoelectric effects at a...

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COMSOL Releases COMSOL Multiphysics version 4.3a

We at COMSOL are proud to introduce version 4.3a of COMSOL Multiphysics to the COMSOL community See: http://www.comsol.com/products/4.3a/ This introduces: * LiveLink™ for Excel® * LiveLink™ for Solid...

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How to fix the error "Out of memory in stationary solver."

hi ! I'm Lam, I construct a model.when i play function 'compute' in STUDY and see error "Out of memory in stationary solver." please show me how to fix it. thank you for comment.

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Comsol not following ideal gas law or conservation of mass

Hello, I am currently working on modeling a high temperature hydrogen heat exchanger. I decided to start as simple as possible and just model the heat transfer into an axi-symmetric tube of hydrogen...

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Frequency Domain Study

Hi, I'm starting to use Comsol and I'm trying to do a frequency domain study on a poroelastic material subject to a sinusoidal load which frequency is in the range 1 to 100 Hz. My problem is that I...

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Temperature Depdendent Electrical Conductivity acting weird.

Hi Everyone, I have two simple questions that I have been unable to answer after trying to work on them for a week. Please help me: 1) I have a very simple model (which I have attached), I am passing a...

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highly conductive layer

Hi, I tried to do a simple transient heat transfer model as follows: one model with a thin solid domain on top of a thick domain and another model with highly conductive layer on thick domain. The...

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Filling an "empty" space

Hello, I'm new to Comsol and a novice at SW2012 It seems in order to model fluid flow through a heat exchanger, the volume filled with fluid (helium in this case) must be included in the model as a...

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No eigenpair solution selected

I am getting this error message - "No eigenpair solution selected " when I hit compute. Can someone please help me solve it. Thanks, Rohan

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error in stationary solver

I am modeling 3d capacitive accelometer , during simulation process i am getting the error :"out of memory in stationary solver". kindly can any one help me out .

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Non-isothermal flow Vs conjugated Heat transfer

Hello all My problem is like flow through a pipe surrounded by a sold domain. Outside the pipe there is a small domain(inside the solid domain) maintained at constant temperature of -10 deg C and water...

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dielectrophoresis

how to simulate dielectrophoresis

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