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import a bmp image into COMSOL geometry

Hey, as stated in this webpage: www.comsol.com/products/formats/ Comsol can both read and write few types of images. However, when I tried to import a bmp image as my structure for flow simulation, it...

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What's the formulation of "mechanical energy flux" in COMSOL?

There are "mechanical energy flux," "complex mechanical energy flux" which I can derive or plot in the result. They are cool but still I want to know the definitions of them, how it calculates, and I...

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rigid particle carried by a channel flow

Hi I have to simulate the displacement and rotation of a rigid prticule in a fluid flow and I am not a professional on comsol. So, is there anyone who could help me? or if you have any examples of this...

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Hysteresis loss Modelling of Inductor coil

Hello I have simulated inductor using AC/DC module and I have calculated the inductance and magnetic field around the inductor but now I want to calculate the hysteresis loss in the inductor. For that...

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On microstrip impedance computation

Hi everybody, I'm a very beginner COMSOL user, I started just some few days ago with the 4.3a version and I need to build some microwave sensor models. I started trying to realize some very simple...

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unit normal vector

Hello, I am solving a PDE using coefficient mode. I have a scalar filed, variable C, which has arbitrary boundary inside the domain (picture 1) that evolves with time. I want COMSOL to find the unit...

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Outlet for transient cases in two phase flow

I have problems converging a two phase flow with water and air. When the water exits the computational domain, I can see reflection of water. Also some cases diverge before the water reaches the outlet...

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Scattering boundary condition and port with plane wave

Dear all, I want to simulate the periodic nanostuctures on silicon. now i am using comsol 4.3a version which is not supported PML with port boundary. for that i need to define the Scattering boundary...

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Help understanding how boundary conditions for identity pairs work

Hello everyone, I’ve been reading through these discussions and the Comsol help guide, but am still having trouble wrapping my head around exactly how the boundary conditions for identity pairs work –...

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Defining dispersive material

Hi, I need to define a material that has Eps Real = 1 and Eps Imag = 2 at 0.1 GHz. How do I fit a 1st order model for this material? I have uploaded a screenshot of the dispersive curves for this...

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Concentrated Chemical Species

Hello All, I am in trouble defining the constraint for the dependent variables (mass fractions) in Concentrated Chemical Species physics. I have the mass fraction of Species A to E and one inert (total...

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General question regarding dimensionality in Comsol

Hi, I'd like to ask a question about mixing problems of differing dimension in Comsol. My interest in this question comes from electromagnetics, but I think it could be useful in many areas and I...

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Regarding structural mechanics module

Hi all, I can see only solid mechanics and poroelaticity in structural mechanics module in add physics.Can i add more modules to structural mechanics module.If so ,please tell me how to do it?

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magnetic concentrator

Hello, I work on a cold crucible for the fusion of silicon with a coil around (around 10 kHz). I have done a 3D model of the crucible to know the efficiency of the crucible (how power is transmetted to...

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Looking for someone with comsol experience for a comsol job

I need some comsol models to do in the next month. I don't have the time and experience to finish all so I am looking for some help. This is like a job project if someone is interested. The simulation...

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Parametric Cutlines and Exporting of Data

Hi, I am currently solving a parametric sweep problem where I am varying a geometry parameter. I wish to create a cutline on the geometry which depends on this. Currently I have my cutline defined with...

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Solving a system of coupled PDE

Hi, I try to solve a system of coupled PDE with Comsol. Unfortunately, I have problems to choose a suitable solver. Details of my question and a model file are attached. I would be very grateful for...

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Incorporating Lagrange Multipliers

Hello again, Thanks to the help of those on the forum I was able to incorporate weak constraints to get accurate flux calculations in my diffusion models. However, I am trying to understand how exactly...

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BH Curve as function of normH and T

Hi, I'm study the induction heating of a billet and I'd like to implement a BH curve as function of normH and the temperature. I have an analytical formula for that where I compute the normB as...

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Velocity Profile with Gas Absorption or Combstion

Dear all! I am wondering if it is possible to link the velocity profile of a gas flow to its concentrations, or partial pressures. For example, if you have 10% NH3 in air and you're scrubbing it with...

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