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Calculating EM Force in the Electromagnetic Waves (emw) Environment

Hi, This should be a very straightforward question. I would like to calculate the time-averaged electromagnetic force (via integrating the Maxwell Stress tensor over a surface). The fields that I need...

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Using external file data for heat source

Hi all, I am trying to solve a model for heat transfer in solids using external data as heat source input. The geometric model is simple and composed of 3 separated bodies attached together by a...

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phase transformation

hi everyone, I'm looking to modelize a phase transformation in the Titanium alloy ti-6AL-4V during the course of the beta-phase to alpha-phase. I'm not sure if Comsol can do that or not. If the...

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Unsteady Analysis

Hi, I am solving a unsteady state problem, in which i need to solve two unsteady equations. The solution of first unsteady state equation, which depends on time, is used in solving the second unsteady...

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particle tracing

Hello everyone, I have a problem with the particle tracing module: I want to evaluate mixing performance of a mixer. how I can define four part at rotating machinery and then define unique particle...

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Natural Free Convection

Hello, I'm attempting to model the temperature rise above ambient over the period of one day within a sealed concrete trough buried in soil with its top exposed to outside air. I have successfully...

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Baw Resonator Problem

Hi I am working on a baw resonator. For our simulation we have considered a 3.5a COMSOL 2D model of Thin Film Bulk Acoustic Wave Resonator in the model archives of COMSOL. So we treid to simulate the...

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Trouble coupling heat transfer physics for both fluids and solids

Hey all, So I'm getting stuck with my model where I try to couple three different physics. The three physics are: Electric Currents, Heat transfer in Solids, and Heat transfer in Fluids. Basically what...

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probleme in imposing current, and measuring resistance

Hello I am a beginner in comsol and I want to calculate by geometry factor using the AC / DC module, of a cylinder with 70mm diameter and 20mm height. This cylinder contains eight electrodes (similar...

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Simulation of a floor heating

Hi all, I want to simulate a floor heating in a 2D modell. Floor heating systems release about 90 % of heat in the form of radiation and about 10 % in the form of convection. So is it possible to take...

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How to applicate a Magnetic field

Hello I'm beginner wuth Comsol and i wish to applicate a magnetic field into the metal structure of a surface acoustic wave sensor. Thank you for your help

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Error to initialize a physics interface created with Physics Builder in...

Hi all, I am trying to compile with LiveLink for Matlab (Matlab version MATLAB_R2012a) a Comsol model (Comsol version COMSOL 4.3.0.151) that uses a physics interface which I created with the Physics...

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modeling electric current

Hi I need to obtain the electric current density field in a medium attributed to a pair of source and sink electrodes with known current. what physic should I choose and what boundary conditions...

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electric currents model

Hallo, i have a question about the electric currents model. My simulation is 2D axisymmetric in frequency domain. The geometry is a solenoid which has two turns. As you know, if the current flows...

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How to realize moving boundary integration in COMSOL?

This is a math problem in calculating the photo-ionization of streamer discharge by comsol. The 1-d calculation domain is (0,d), and one point inside this domain is x. We need do the calculation in two...

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Spatially-varying boundary condition (electric potential)

Hi all! I am using the Electrostatics package and need to define a surface with a linearly-varying electric potential that depends on one dimension of the model (e.g. V(x,y) = Kx). I tried to define a...

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heat generation calculation

Hi, I am modelling microwave heating by Comsol 4.2 I used heat source domain and electromagnetic power loss density as heat source but I couldn't calculate heat generation terms (W/m^3) When I use...

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Rectangular Pulse Train Creation

Hello, I am attempting to create a pulse train for my model. I am new to introducing pulses and would like an equation to place on my electrcial potential module to create the following: Rectangular...

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Surface tension as a variable

Hello all, I have a general question about surface tension in COMSOL. Can surface tension be assigned as a dependent variable? More importantly, can it vary in time AND space? Or be assigned as a...

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2d_generator

Hello. Please answer my question. How to add a power calculation, together with the schedule of power from time to time in the model 2D_generator?

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