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Computing power
We want to buy the fastest computer we can find (or afford) for our CPU-locked license, working on extremely complex rf/microwave problems. My understanding is that this license will only utilize up to...
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Simple Java Programme does not compile in V50
Hallo, the very simple java programme below works in version 4.4 of Comsol but not with version 5.0. There are no error messages, but the class-file is not generated. I run (on Linux): comsol compile...
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heat transfer influids
Hello, I did an experiment in labaratory, and now try to model it in Comsol. I had an ice "dumbbell", filled with water in gaps (in comsol i use simmetry). Insulation was everywhere, except ice...
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Orthogonality of eigenmode's spatial profiles
I'm working on a plate vibration problem using eigenvalue analysis. The dependent variables are u, v, w and arx, ary, arz. I export the mode profiles sampled at a grid and for some reason the modes are...
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Picosecond pulsed laser heating problems
Hello, I am trying to model the laser heating of silicon using a picosecond pulsed laser but have been encountering some problems that I can't seem to solve. Firstly the model: I have a 3D rectangular...
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Imitate the radiation pattern of an antenna
Hi, I am quite new on Comsol and i am trying to imitate the field emitted by the radiation pattern of an antenna. In other words, I have a radiation pattern antenna, and I would like to have the same...
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Using contact post-processing variable
Hello everyone, I want to use the post-processing variable solid.gap_p1 from the Contact pair definition in defining a gap-dependent force, e.g. force = C *gap_p1. How can I choose the gap variable in...
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temperature is a linear function of the length of the geometry
hi, i am simulating heat transfer in a cubic solar cavity with one face opening to the ambient. i want to give temperature boundary condition on a phase adjacent to the aperture as a linear function of...
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modeling of induction current in a metallic core in inside a coil with...
Hi, I want to simulate induction current in a metallic body inside a coil in mf module. As found in tutorials “single turn coil” or “multi turn coil” are suggested for this case. But in the version...
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CAD import problems
Hi I'm trying to CAD import a 3D solid object and I get a " self intersecting faces" message when I mesh. using the "repair" feature doesn't help , For low tolerance nothing happpens. High tolerance...
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gas mixtures dielectric barrier discharge
Hi everyone, I am working on DBD model in N2-He gas mixtures using Plasma DC Discharge module. For exemple if I take a mixture of 40%N2 with 60%He , how can I specify the quantity or the percentage of...
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oxygen gas surface reaction and the product diffusion into the block
there is an boundary condition question on the process of oxygen gas surface reaction and the product diffusion into the block. oxygen gas reacts with the metal on the metal surface, and the productof...
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the maximum concentration of metal oxyde
I have question on the surface reaction I have done a model on Metal oxidation reaction and diffusion process. and I have get some results on the concentraion of metal oxyde. but the concentration of...
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Chemical Reaction Engineering problem: concentration of products is too high
Hello everyone I guess I have a simple problem but I don't know what I'm doing wrong. When I've got a simple reaction, sth like: x => 2z and I enter an inital value for the concentration of x=1...
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Selecting Similar Objects
Hii, I have a model where I have say 2000 objects. 500 of them are circles with a certain diameter. I want to select all of them (and then extrude it) . Is there any way to do the selection...
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Solving a 1D partial differential equation
Hello I am trying to solve a 1D PDE, where the dependent variable is temperature, 'u' and independent variables are spatial coordinate, 'x' and time, 't'. My equation is of the form du/dt = k*d^2u/dx^2...
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Wher can i reverse my axis?
Hello My geometry is made from 0 to -5 in y direction. So y axis on the 2D plots goes from 0 to -5. I want to reverse this so i get the same plot but y axis goes from 0 to 5 instead. Thanks Arash
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solving two partial differential equations nonlinear in comsol?
Hi, I want to solve two pde nonlinear with two variables (please find in the attachment file) with the constants. For solve, i tried to use the heat equation and PDE (c) in two step: step 1: solve...
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Meshing Problem
Hii, I have having problems with meshing in this file. I have tried all solutions provided in the community but to no avail. Can someone help me out ? The file is attached :) Thanks in advance....
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geometry inside another geometry
Hi, İ just started working on Comsol and going through the basic tutorials. The problem i am encountering at the moment is let's say i am working on 2D ( i have similar issues in 3D). İ create a...
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