How do you determine the spot of a Gaussian beam defined by "ewfd - Gaussian...
Hi, everybody, I want to simulate the motion of the microsphere in the optical tweezers system. I used "ewfd - scattering field - gaussian beam - plane wave expansion" to define the incident field, the...
View ArticleHOW TO DEFINE THE material of NeFeB
HOW TO DEFINE THE material of NeFeB ，such as NdFeB
View ArticleModel shape change over time
Dear all,I would like to simulate the temperature entry during laser drilling of a microsieve in Comsol. Is it possible that after drilling a hole, the created hole is included in the model form? So...
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Impedance in a PCB: a strip line between two ground shields
Hello,I would like to compute, among other parameters, the impedance in a PCB, for a strip line between two ground shields. An approximation can be use to compute this impedance given by:where and t...
View Articleproblem with comsol geometries
I'm trying to simulate a 2D electrostatics IMS however i can't find a beizer polygon (linear one) in the primatives or geometries.how should i get it ?Thanks.
View Articleheat transfer in solid, pulse
Hi all,I am simulating pulsed laser material interaction. When th pulse duration is in milisecond range, I would get reasonable resutls. I mean as it would be expected the heat will be dropped down in...
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How do I implement the continuity equation in COMSOL?
Hi,Can anyone here guide me in implementing the continuity equation as given below in the comsol? Any example mph files with similar equations implemented would be of much help.where, porosity, density...
View ArticleProblem with particles trajectories for fluid flow
I performed a microchannels simulation with high flow rates. then I added the particles tracing for fluid flow physics. then I set up the dinamic study with a step of 0.0001s. However, some particles...
View ArticleParticle tracing for fluid flow: wall interaction limit!
Dear Support Center,I performed a fluid flow simulation (turbulent, k-epsilon) and then a particle tracing one. I employed 1000 particles and used "bounce" as a wall condition. This is fundamental to...
View ArticleHow to assert heat flux in the physics "Radiation in Absorbing-Scattering...
Hi everyone,I am currently trying to simulate a layer of semi-transparent aerogel under sunlight. I try to do it in the physics "radiation in absorbing-scattering media", so that the absorption...
View ArticleHow to run Heat solver and PDE solver sequentially?
Hi,When simulating the photoacoustic signal of nanoparticle, I try to use the second derivative of temperature (simulated by the Heat Transfer in Solid module) as the driving term of the PDE. The...
View ArticleElectro coalesce
I am trying to simulate a COMSOL model with electrostatics and laninarflow to merge two water droplets in oil medium. I see that the droplets are merging even at zero volts and zero inlet velocity. I...
View ArticleError in running Wave Optics Study
Hello! I keep running into this error when computing my study. Any help would be much appreciated.Feature: Stationary Solver 1 (sol1/s1) Division by zero.Function: / Failed to evaluate...
View ArticleDoes "Radiative Beam in Absorbing Media" takes the emission of the media into...
Hi everyone,I am using this physics to simulate an aerogel under the sunlight. It is said that this physics could be applied as long as 3 requirements are met, and one of them is that "there is no...
View ArticleRegarding a multiple heat flux boundary condition
I am using COMSOL with MATLAB Livelink on a cluster. Now in MATLAB I get say 10 Heat Flux values for 10 concentric rings on a surface which I need to pass on to COMSOL for further heat transfer...
View ArticleEigenmodes
Hello everyone,I am doing eigenmode analysis. I have all the Study section working (simullation run without any trouble).When I get to taking my results out of it, though, I see that there is no...
View ArticleWeird force values in Electrostatics module in COMSOL
Hey all,I am trying to simulate the force between a large grounded sphere and a small charge but the values I get do not match the analytical solution and the force in the z-axis, which should be...
View ArticleDomain point probe in moving mesh
Hello,I am trying to evaluate a dependent variable at a point very close to a geometric boundary that is moved using a moving mesh. I can do this by introducing an additional boundary parallel to the...
View ArticleSweeping Mesh on a Cylinder in Comsol 5.4
Hi I am new to Comsol and I am having trouble with the meshing of my geometry. I have a 2D-Axissymetrical cylinder. I want to define the Mesh at the inlet(lower edge) to be very fine, take that...
View ArticleSemicondutor - EM module interface
i am trying to simulate a photo diode using semiconductor module and electromagnetic , frequency domain (wave optics) but i am facing following problems (1) whenever i am trying to define[used defined...
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