Magnet in AC field
Hi Guys, I am currently writing my master thesis and need to get familiar with it in Comsol. After a few small successes, I now have a problem.I would like to simulate a magnet that aligns itself with...
View ArticleHelp regarding post processing of streamlines
When i plot the streamlines in comsol using streamline positioning as uniform density, the streamlines are appeared as discontinuous lines i.e. there are some breaking sections in the lines ,but...
View ArticlePDE
HiI have a 1D domain. The boundary conditions for electrostatic potential are given as 5 volts on the left boundary and the electric potential gradient on the right boundary is zero.How should I...
View ArticleModelling of polymer degradation
Dear Altruists, Do you have any first-hand experience on implementing polymer degradation on COMSOL? I would love some directions from you.Thank you.-Regards, Biswarup
View ArticleIs there any difference between 'free and porous media flow' and 'reacting...
My project involves mass transport through convection and diffusion + free flow in pipe + flow in porous media. I know in 'reacting flow in porous media' we can couple mass transport too while 'free...
View ArticleUse an external signal in time domain into the frequency domain
Hi, I want to use an external wave (in file .txt) in frequency domain electric circuit. Using time domain I have no problems and I have used this waveform in DC generator, but the problem is to use...
View ArticleAC and DC current in the busbars/wires
I am struggling with a simulation of the AC/DC module, where I would like to simulate for example 4 busbars/wires/cables of 2000mm2 areas, the input is High Current(100kA). And I would like to consider...
View ArticleNernst-Planck-Poisson
Hi I am working on a Nernst-Planck-Poisson model and would like to see the effect of pH changes on other ions. Can anyone help me with the changes in pH and H + on this model?
View ArticleParticles removed from simulation
While simulating in Particle Tracing for Fluid Flow, I encountered with a warning saying: "Some particles have been removed from the simulation because of a failure in finding the wall intersection."...
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Maxwell stress, fluid volume force, axisymmetric
The below post is related to an archived discussionSo I have seen variations of this question around, like in the post above, but I still cannot make out the right answer for my problem.I am simulating...
View Article2D-Axisymmetric Simulations
The below post is related to an archived discussion[start here]Hi all, I've provided a link to a previous discussion that somewhat addresses my question, but I am still looking for additional insight....
View Articleplot intensity in a Ray Tracing Computation
hello every one , how i plot the intensity in ray optic . as in a ray optic model , properties has determined for each ray , we cant have properties for all of the points of geometry . and when we want...
View ArticlePressure Acoustics. Creating point source at a specified coordinate.
Hello, I am trying to simulate a speaker to radiate equally in all directions within my domain. I would think I would use the monopole point source however I’m unable to specify exact coordinates (x,y)...
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Electron mobility calculation in Plasma module
Hi,I am building a model with plasma. I found a paper (doi:10.3390/proceedings2130948) talking about the electron mobility in plasma. It provides a formula to calculate the reduced electron mobility. I...
View ArticleMultiple Studies vs. Multiple Steps in a Single Study
Hi all,Can someone summarize the pros & cons of configuring a model with multiple studies vs a single study with multiple steps? I've read through the documentation refence manual and searched the...
View ArticleFresnel Equation：what does an observation port exactly mean?
In the tutorial, it says that port2 is an observation port, but what does an observation port exactly mean? Notice that in the port mode settings of port2, the norm of E is still the same with port1,...
View ArticleA question on fluid-solid coupling
The turbulence model is SST.Study its transient velocity and time，but the convergence results show that the velocity of the fluid is 0, and there is no time option. How to solve? !
View ArticleRelative Residual Is Greater Than The Relative Error
Hi, Can you please explain that why I get this error? Is it because of meshing or pressure value that I gave? I am using both Darcy's and Solid mechanics.Thanks,
View ArticleHow to apply impulsive force in body load in the transient simulation of...
Sir, I am using Comsol multiphyics5.3a license version 10677635 in our institute for the simulation of our piezoelectric energy harvester. In the time-dependent solution, we are using body load physics...
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Funer's model in plasma simulation
Hi,I am simulating a model with strong plasma-field coupling. I found some papers using Funer's model: , where is the electron density and is the minimum electric field intensity to maintain the plasma...
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