Nernst equation
In ion transport, I used electrostatic and dilute material transport interfaces, as well as Nernst-Plank-posson, but I can't find an interface for Nernst equation. Which expert has relevant experience...
View ArticleModelling a Lumped Battery thermal Runaway model.
Hi! I'm an absolute beginner in Comsol and am looking to model thermal runaway in a Li-ion battery, having a lumped thermal system. As far as I have understood, I need an electrical short ciruit model,...
View ArticleHow to use comsol to simulate solid thermal decomposition
How to use comsol to simulate solid thermal decomposition，such as 2Co3O4<=>6CoO+O2.Are there any relevant cases?
View ArticleThree-dimensional microwave rotating heating
Hello, I would like to ask what method is used to rotate the heated object in the three-dimensional microwave cavity? At present, I have tried using a moving grid (ale), but the result is not...
View Article2D Plasmonic device
Hello Everyone, I am simulating the 2D plasmonic device, but I think I am facing a problem with a boundary condition (I used periodic boundary conditions). I am attaching the Electric field intensity...
View ArticleNonlinear Piezoelectric devices implementation!
Hi, i have a serious question about how to implement the nonlinear piezoelectric effect.i have to implement the nonlinear piezoelectric effect until 3rd order as you can see in the attached image file....
View ArticleCalculate magnetic field around a PCB board
Dear Mr./Ms. Comsol, Is there any tutorial about magnetic fields calculation around a PCB? Since the concerned frequency is only several kHz, the magnetic field is still decoupled from electric field....
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2D-axisymmetric vs 3D in magnetic (AC/DC) simulation
I have been simulating a motor assembly of a transducer. The simulation started with 2D-axis model. Everything was looking fine. I then created a 3D model using the 2D exported geometry. Difference...
View ArticleHow to model gas compression in porous media?
Hi,I have a situation where a porous medium is initially saturated with gas (e.g. methane not air) at 300 psi. The geometry is a square. From the top boundary water has to enter the medium and compress...
View ArticlePlot data P(x,y,t) along the selected line.
Hello,Could you please help me with plotting the results of my pressure acoustics, time explicit simulation (pate).I need to plot the results along the created line. I draw a cut-line (in the results...
View ArticleDamping ratios are added to a system that is not decoupled by the given...
Hi everyone, I run a frequency domain modal analysis , based on a eigenvalue study which returned to be 20 eigen modes. What I did is give a single 0.02 damping ratio( I just use one damping ratio) in...
View ArticleAcoustic within "eigenmodes of a room"
Hi,I need some help in comsol.I am working in the default project "eigenmodes_of_room" and created an additional "normal velocity" boundary with 0.1 inward velocity. Then i added an "impedance"...
View ArticleWicking in a Paper Strip
Is there any way model the wicking flow in a T-shaped paper strip?Thanks, Swapnendu
View ArticleMesh original and displaced coordinates
I am trying to use Global ODEs and DAEs equations,.....equation is that u(X,Y,Z)=0 where X,Y and Z are original coordinates of mesh nodes,.....u is the displacement of the nodes in x direction ( so...
View Articlepractical excitation in comsol
Hi I have geometry of two coils in air space . I have waveform excitation which has different voltage with different time . I want to use the data of wave form voltages in Magnetic Fields (coil) as...
View ArticleFinding the fundamental longitudinal eigenfrequency of disc
Hi,I'm trying to figure out the fundamental longitudinal eigenfrequency of a circular disc (thin cylinder). I'm using the eigenfrequency study from the Structural Mechanics physics. When I put the 2...
View ArticleHow to set up a hydrodynamic module to explain the CONDA effect？
To solve the bottle blowing out candles, with this software how to build it？Could someone please help me？I would be most grateful.
View ArticleModelling droplet evaporation of aqueous saline solution
I am modelling droplet evaporation in a sessile droplet of aqueous saline solution. I am using the laminar flow, heat transfer and transport of diluted species module. I am keeping the volume constant...
View ArticleApplying existing solution as an initial guess for frequency domain simulation
Hi all,I have a general question regarding frequency domain simulations.I've been doing frequency sweeps in frequency domain simulations a lot. Usually for a small change in frequency (for example a...
View ArticleSolid Oxide Fuel cell modeling
Hi, Friends, I am a new user of COMSOL and want to build a SOFC modeling. I need to get the temperature distribution of SOFC，so I used the Porous medium heat transfer module. I don't know how to set...
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