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Shared Boundary Problem
Hi, I am kind of new to COMSOL. I am working on impedance meta surfaces. My 2D geometry consists of two identical rectangles which share one common impedance boundary. I cannot figure out how do I have...
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Need help regarding geometry
Hi I am developing a continuous casting model of L-shaped channel. To make the geometrical structure of L-shape, I am facing problem in it. Do I have to make 2 blocks and combine them ? If yes, how ?...
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How to limit the deformation to contact surface
Hi Comsol, I am doing a mechanical deformation simulation. My structure is mainly composed of two parts. The top part is made of glass. The bottom part is made of rubber with Young's modulus of 1.5MPa....
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Temperature Dependence / Material Properties
Hi All, I notice that COMSOL has several built in materials with properties defined as a function of temperature (or any other input variable for that matter). As an example, in Laminar Flow physics,...
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Substracting a coil from a pipe
Hi, I am building a barrel to wind a wire on to. The helix i defined with the primitive geometry The barrel wire is mounted on, i have swept a square work plane along a parametric equation, of the...
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basic query on multi turn coil domain feature
Dear sir/madam, I've started working with Comsol very recently. While I was trying to simulate a coil with 100 turns using the MTCD feature and trying to see the the effect of eddy current on a...
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How to use the meshed grids as seperate domains?
In my model, the material properties change along with every single grid. So I should try to make sure that every grid is a single domain so that I can assign a different material property. Anyboby...
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capacitance between multiple plates
good morning; i have a three plate 2D problem and i would like to calculate the capacitance between the relevant plates. over what surface do i need to integrate to get capacitance? when i calculate...
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How to deal with the nonconvergence at interface in solid mechanics
Hi, Recently I encountered a problem. When I used solid mechanics module to simulate the thermal expansion deformation of a particle-matrix system(a sphere particle included in a matrix, axi-symmetric...
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How to limit a membrane deflection
I am simulating a membrane deflection under pressure. There is a substrate underneath the membrane with certain air-gap in between. Under large pressure the membrane should make contact with the...
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instead of gauss function for doping profile how to change to uniform dope...
I was wondering if anybody familar with ComSol multiphysic? I built a diode based on the tutorial from ComSol 3.5 but now i want to make changes to the doped region of n and p. instead of using gauss...
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Thermostatic chamber validation
Hy Guys, I'd like to ask you some questions about the validation of a model of a thermal chamber. Could you give me a feedback about it?Have you worked on that model? How do you implement thermal...
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PDE with algebraic equation
I am trying to implement mass concervation myself, but I do not understand how to do this correctly. To keep it simple at first, the density rho is constant Mass conservation PDE: d(rho)/dt +...
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Light reflectivity and transmitivity of periodic surface structures
Hello, I am trying to simulate the reflectivity and transmitivity of different wavelengths of light on a periodic surface structure. 1) I am using a 2D simulation using the RF module to create a basic...
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Electric field propagation through waveguide window
Hello everyone, I am studying effect of fused silica window inserted into circular waveguide. I have modeled it using 2D axial symmtery and simulate for TE01 mode at 140GHz frequency. I have attached...
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parallel processing ,cluster ,batch
Hi every one , is it possible to run parallel processing in win 7 or 8?
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Time dependent contatc problem
Hi, Recently, I want to simulate the indentation problem with COMSOL. So I need to consider about the contact problem. However, I found many discussion said COMSOL cannot solve the contact problem with...
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2D Axisymmetric Weak form PDE
Dear COMSOL users, I want to solve a system of PDE's using Weak form PDE in 2D axisymmetric system. My question is: should I multiply the weak expressions by 2*pi*r or not? Thank you very much in...
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Flow velocity profile in a microchannel
Hi All, I would like to see the velocity profile in a microchannel for laminar flows. I used laminar flow in microfluidic module but unable to see the velocity profile. Does anyone know how to do it?...
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time dependent capacitance
Dear all I am new in COMSOL. I have a few questions related to the capacitance. 1. How to compute capacitance in time dependent study ? I couldn’t find any capacitance in the postprocessing menu in...
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