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Integration of fields from PDF solutions
Hi, I am working with COMSOL 4.4, Multiphysics, solving three different physics models on the same geometry. Two of them are Electrostatics, (a potential field "V" and another "weighting" potential...
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Convergence problem in a simple geometry with Joule heating module
Hi guys, I am modeling a simple geometry (some stacked layers) with um and nm dimensions in comsol 4.3b. The convergence plot goes down rapidly at first and after some iterations it seems that the...
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Meaning of right-hand terms in the drift-diffusion equations in DC Discharge...
Dear All, As shown in the picture I attached, the right-hand terms of the drift-diffusion equations for electron density and mean electron energy in actual model are different with those given in the...
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How to determine domain number from a given block name.
Hi I'm currently working with a project where I have to prepare a model to be illuminated in the RF module by microwawes and ultimately being able to determine the location of tumors in human tissue....
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Coupling Physics
Hello!! I want to know if anyone can help me with the following problem: I have a material in which I defined the conductivity tensor taking into account that I will apply a magnetic field. I generated...
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ACDC Frequency Domain simulation with two different frequencies
Hello, I am trying to simulate two resonance circuits using the ACDC Module. How can I simulate the system in the frequency domain considering that the voltage sources of the two respective circuits...
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power through scattering boundary condition
Hello all; Im using scattering boundary condition as power source to illuminate my structure. Everything is Ok with that but I just don't know how to calculate the amount of power that is going through...
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Parameter value list (elastoplasticity)
Hello everyone, I'm simulating a tensile test on a steel tube presenting some defaults with external strain-stress data. I want ultimately to have a strain-stress curve plotted by Comsol for the...
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Different Meshings for different Domains
Hello, I am trying to understand how meshing works. In particular, I am trying to figure out how to make different size meshes for different domains in my project. I have two 3D objects in my scene....
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Mesh generation in Comsol 4.3b for Stacked
Hi Guys. I have 4 stacked layers starting from very thick (50 um) to very thin (30 nm) thicknesses. I have problem with mesh generation. Tried everything but could not mesh the geometry. The thinnest...
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How to calculate total pressure drop (inlet - outlet) of 3D ventilation...
Dear Comsol experts, I am a novice in comsol 3D and would appreciate some help in post processing my results - calculating the total pressure drop (3D) of my model. I have made a simplified 3D model of...
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How to obtain the mass moment of inertia
Hi! I need to find the moment of inertia of a complex structure. Anyone knows a way to calculate it? I took a look at the forums but the info I saw was very confusing. Thanks a lot!
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Parameter sweep and solution steps help
Hello, I am new to Comsol and I am having some trouble using the parameter sweep. I am modeling a floquet boundary condition in eigenfrequency analysis for a solid mechanics model. I need to set few...
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holes creating in membrane
i am making a cantilever mems .I have create a membrane but i have some problems that how can a i create muti hole and slots in the plate .
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Integration of fields from PDF solutions
Hi, I am working with COMSOL 4.4, Multiphysics, solving three different physics models on the same geometry. Two of them are Electrostatics, (a potential field "V" and another "weighting" potential...
View ArticleClik here to view.
Convergence problem in a simple geometry with Joule heating module
Hi guys, I am modeling a simple geometry (some stacked layers) with um and nm dimensions in comsol 4.3b. The convergence plot goes down rapidly at first and after some iterations it seems that the...
View ArticleClik here to view.
Weak form boundary condition, a problem of mechanics.
As i tried to do the poroelastic simulation in PED , weak form, i firstly built up the weak equation for linear elastic part. All ran fine, and was tested and compared with results obtained in Solid...
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Modelling small fibres
Dear COMSOL users, I am trying to model carbon nanotubes (CNTs) inside an Epoxy and I encountered a few problems, does anyone have a solution? The model is an Epoxy block with randomly dispersed CNTs...
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Meaning of right-hand terms in the drift-diffusion equations in DC Discharge...
Dear All, As shown in the picture I attached, the right-hand terms of the drift-diffusion equations for electron density and mean electron energy in actual model are different with those given in the...
View ArticleClik here to view.
Generic Error
Hello everyone, I am using the COMSOL 4.4 AC/DC Module to reach the saturation of an electrical steel block with the help of (two) current coils. Therefore I implemented a HB-curve in the materials...
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