Heat transfer module: no surface-to-surface-radiation modelling found
Hello everybody,I tried to set up a simple simulation (Comsol4.4) to estimate heat transfere in our experiment. Since some parts are cooled to low temperatures, it will be nessecary to implement...
View ArticleIntegrate data from file
I have a question about integrating data from a text file in COMSOL. I haven't been able to find anything on how to do that, but I think it's pretty simple. The data has two columns, the first being...
View ArticleLift application point
Hello,I am working on the lift along a windsurfing board in high speed (planing). I can compute the lift for all the surface but I would like to find the lift center point of application on the board....
View ArticleRadiation of a point source into a semi-infinite space
Hello,I'm trying to make a simple model of an acoustic point source radiating into a semi-infinite space.I have built the model by defining a monopole point source in the origin of a sphere. The sphere...
View ArticleSolver problem - Multigrid sublevel has more degrees of freedom than top level
Hi,When I run a computation for my model for laminar flow, comsol returns the error "multigrid sublevel has more degrees of freedom than top level". Does anyone know how I can fix this?Maybe I should...
View Articleparticle tracing
Helo, I am working on a particle tracing case in comsol 5.2a, exactly on inertial focusing in pipe. In this problem when a neutrally bouyant particles are carried by the flow in a pipe after some time...
View ArticleFiltering a volume to calculate in a subvolume
Dear All, I have two crossing pipes where I solved the flow (two inlets and two outlets). In the POSTPROCESSING, I would like to ´select´ one cylinder and have the possibility of calculating the...
View Articleerror in multiphysics compilation
HiI'm running a time dependent study on a mixer. Considering reaction and turbulent ( k-e ) in physics. I get this massage:" A rotating domain is attached to a stationary domain, Creat assembly...
View ArticleSafety factor
Hi everybody!I have tried to do a beam with two fixed points applying to a normal force in the middle of the beam. I have been ablo to see what is the 3D deflection of this solid, but I would like to...
View ArticleHow to add external current density
Hi,I'm trying to do something I think should be very simple and have been unable to so thus far. I'd like to study the response of a circuit to a magnetic field. This field can be effectively produced...
View ArticleIssues with meshing in Comsol for Matlab
I am using MATLAB to run optimization loops on my COMSOL model. I do change some model input parameters in the optimization, but it doesnt change the number of domains or boundaries, only the size of...
View ArticleCoupled Electro-thermal model (Using variable from one study step as input to...
Hello all,I am doing a coupled electro-thermal model in comsol. I solve the magnetic field with a stationary solver and the thermal with time-dependent. The coupling is some sort of weak coupling. In...
View ArticlePhotonic Crystal Mirror with Beam Envelopes Module
Hello!I want to simulate a photonic crystal mirror with the beam envelopes module (see attached project file). I chose the beam envelopes method instead of the frequency domain method because...
View Articleflow point source
I am doing simulation using Acoustics module. Problem is that how can I select a specific node to be a point source? And How can see the results at a specific node in side of the object? How can apply...
View ArticleCoil group
Hi, I'm modeling a permanent magnet machine and I need to configure a set of coils as in the attached image. I will be really grateful if anyone could help.Regards, Paulo
View ArticleUnit in Accumulator in the Particle Tracing
Hi, all:I would like know the particle distribution in a 3D domain, so I added "Accumulator" in the Charged Particle Tracing. I am wonder about the unit in the Results (Particle Trajectories, Particle...
View ArticleBoundary Current Source and Sink
Hi everyone,I have a simple pair of electrodes, one with a current excitation of 1mA and a counter electrode with a current excitation -1mA, which is meant to be the "Boundary current sink" for the...
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Distance between two plates in a boundary condition
Dear Comsolers,using only the Solid Mechanics physics, I try to simulate the mechanical behaviour if a capacitor made out of a rubber-like silicone. The dielectrica as well as the electrodes are soft...
View ArticleSame model, different results
Hello, I am relatively new to COMSOL and am trying to run a study to see if there will be harmonic motion in my model. When I run the time-dependent study with the time being range(0,.01,4)[ms], I see...
View ArticleHeat Transfer Boundary Condition
Hi, I'm trying to model a heat transfer physics with bottom boundary condtion: dT/dz = constant independent on depth (when the depth is more than 5m)how can i do this in comsol? I'm slightly new to...
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