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Non-linear strain
Hi, I have a question concerning Solid Mechanics module. In the Linear Elastic Material, the formulation of the strain is given as: e=0.5[\Delta u^T+\Delta u] However my problem is a bit more...
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problem of global definitions
Hello. Why always display an error variable Settings."Unexpected unit of input" parameters:a-50[A] b-[5e10] c-[1e-5][s] f-2e5[Hz] variables:a*cos(2*pi*f*(t-c))*exp(-b*(t-c)^2) thank you
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Error comes during compute
I am design electrostatic cantilever with diferent width and different material but some errors occur i.e Segregated group2 out of memory during assembly features : sationary solver 1( sol1/s1) error :...
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Deposition within a porous electrode
I am building a (1D) model of a battery in which an insoluble, insulating product is deposited in the pores of a porous cathode. It uses tertiary currents, with a PDE to give the deposition rate. The...
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Mesh of very thin geometries
Hi, I would like to study in a very thin geometry. It is basically a disk (diameter 5mm, thickness 1um) with 4 rectangular channels (width 1mm, thickness 1um). I understand that cannot use the...
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Disc quota exceeded
Hi Guys, I have a transient solution. The Comsol belongs to the university, so that we run it from the server. Everything goes well till I wanna save my work. The error "Disc quota exceeded" appears...
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Please Help - How to use calculated value of a function F at time step 1, for...
I want to calculate the value of a function F(T,t)=A(T)*F(T,t). It means for calculating the F in a time step 2, I need the value of F from previous steps (step1). Can anyone help me to do such...
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derivative of stress
Hi, I have got the stress distribution of a structure, shown in attached Fig. 1. I want to calculate the derivative of stress along y, namely, d(solid.mises,y). But the results I got are zero, shown in...
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How can I define a porous wall in comsol?
Hi everyone, I'm now modeling a membrane filtration process. it a very simple 2D rectangle domain, one boudary is inlet, one boudary is outlet, one is no slip wall, the rest is a wall with porous...
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temperature dependent material properties
Hello everybody for my modell i am working with two materials, which have different thermal properties up to the melting point. material 1 = bulk material; material 2 = powder Both materials have the...
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Conjugate Heat Transfer
Hello everybody, I'm simulating the heat transfer on a detector connected to and cooling of a set of detectors connected to some chips that are heating. I'm doing my project in 2-dimentions in order to...
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Polymer viscosity model about Cross-WLF eqaution
Hello, I have tried to analyze the filling pattern of polymers in injection molding process with COMSOL software. And I tried to apply the shear viscosity of the polymer to the analysis using cross-WLF...
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COMSOL help needed. (RF module - Heating of water using waveguide)
Hello there, I am a relatively new COMSOL user who is in the process of validating a paper, to be able to get a better grasp at COMSOL. The paper I am trying to validate using my simulation can be...
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Failed to find a solution??
How can i solve this problem? anyone knows? Thank you very much Sepideh ========================================================================== Failed to find a solution. Singular matrix. There are...
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structured mesh around cylinder
Hi Comsol Community, I try to set up a Comsol simulation for a fluid flow around a cylinder and I want to use a structured mesh. Is it possible to create a structured mesh around the cylinder (e.g....
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discharge current
i am a new user, and i tried to model 2 D axisymmetric DC discharge plasma jet in plasma module., how can i defined displacement current density on r axis, i cannot plot it, and how can i plot total...
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How to obtain the fundamental mode of fiber by using 2D axisymmetry axis
Hello Everyone, I try to use the Optic Wave module to simulate the fundamental mode of fiber in the 2D axisymmetry axis, but the results show the higher-order modes. Maybe in 2D axisymmetry axis, the...
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3d piezocomposite (xy direction only deformation and zero electric field)
I have a 3d piezocomposite cube. How can i move it in the xy direction only. The other strains have to be zero(S11, S22...etc) How can the volume average electric fields(Ex, Ey, Ez) be predifined as...
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selecting properties of a graph
Hi everybody, I’m new in Comsol and have the following question: Imagine you have in a point graph more than one function (for example, temperature vs. time of a point of your geometry for different...
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Charged Particle Tracing Problems
I am trying to simulate the trajectory of a charged particle due to an electric and magnetic field. The magnetic field is due to a multi turn coil, so I used the (mf) study for that. My electric field...
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