Using simulated potential to simulate magnetic field.
I have a simple 5 domain model, composed of roughly concentric spheres. I am modeling a transmembrane potential on the 3rd domain using the General Form PDE physics. This part is working correctly. I...
View ArticleCoupling Poisson and Transport
Hi, I am using Comsol 4.3a and want to couple Poisson and transport for determining the flow of charge (or electrical current) within an wire due to application of voltage across it. Now, the output...
View ArticleParametric sweep : Can I bypass (ignore)the error occuring for a particular...
In coupled MEMS electrostatic study, I defined two parameters: Vdc and InitialGap. These two parameters were used for parametric sweep on the electromechanics module of Comsol 4.3. Now Comsol runs my...
View Articleerror test failures
hi i use ccp module for simulation,my time range is range(0,5e-5,0.001) but when i compute model times go 7.579247e-019 to this and report this error Repeated error test failures. May have reached a...
View ArticleGaussian Distribution of Particle Size
Hi folks, does anyone know if it's possible to use a Gaussian Distribution of Particle Size function for the particle diameter in the Mixture Model interface? If so, can you provide an example? Best...
View ArticleAbsolute tolerance convergence criteria for flow simulations.
Hey. Normally convergence criteria are divided into a relative and an absolute. Where can I find and set the absolute tolerance for my transient flow simulation. Thank you for your time
View ArticleRunning two GUI's to utilize remaining memory
COMSOL Community: I currently have a frequency-swept simulation running that comprises 30GB physical /41GB virtual memory, off of an 8-core, 128GB system. Even though a sweep in off-normal incidence...
View ArticleContinuation Study
Hi, How I'm gonna do if I want to simulate a study which uses previous result to continue. For example, I completed 1st study and get the result, then I want to continue the 2nd study (settings on...
View ArticlePause an ongoing simulation
Hi everyone, maybe this question has been already asked a lot of times, but using the search tool of the forum I didn't find any adequate answer. I need to use my laptop while COMSOL is simulating, but...
View Articleerro:last time step not converged.
hi....i'm doing transient analysis to get thermal response of microbolometer using "electrothermal interaction". model consists of 3 thin layers of sensing membrane, insulating membrane and substrate....
View ArticleInterrupting Parametric sweep without loosing results
Hi, i'm running a large parametric sweep which turned out to dramatically slow down during the last few combinations. My machine has been crunching for days now and i'm wondering if there's a way to...
View ArticleCoupling Optical Modes and Elastic Modes
Hello, I am trying to find the effects of elastic modes (vibrations) on optical modes in a SMF28 optical fiber in 2D. I am using the solid mechanics model to first calculate the eigenfrequencies of the...
View ArticleWarning message
Hi, I have built a numerical model which simulate dynamic interface (ALE method) My simulation always ended by warning message: 'Warning: Inverted mesh element near coordinates (5.21578e-006,...
View ArticleNernst-Planck equation
Hey everyone, I am new in using the Comsol software (4.1). I want to model ionic behavior in a conical nanopore and need to solve the Nernst-Planck, Poisson and Navier Stokes equations. However I need...
View ArticleHow to model multi domain system in Comsol 4.4 ??
I want to know how to model multi domain system. I want to model adsorption cycle which consists of evaporator, adsorption bed and condenser. How can I model these domains? Also the cycle is operating...
View Articleplot Transmission vs. wavelength
hi all i am using RF module in Comsol 4.3 . and when i get the results , i can not plot Transmission vs. wavelength . i am begginer. can you help me? thanks in advance
View ArticleHelp with two group model
I am trying to make the two-energy-group model by using the "Coefficient Form PDE" module for both the fast group and thermal group. I am having trouble to find the correct solution for the two group...
View ArticleElectrostatic Spring Softening in MEMS structures [ resonator Beams]
While I run "electromechanics" module for a MEMS resonator beam, I select "Prestressed analysis Eigenfrequency". Now my question is whether COMSOL considers the Electrostatic Spring Softening which...
View Articlemodeling phase change material help
hi my name is Zeineb I had a problem at the physical resolution(comsol 3.4) of my problem (modeling phase change), I used to ALE and I got this error Time 0: Failed to find consistent initial values....
View ArticleThermal Stress: temperature response to heat pulse
Hi all, I'm pretty new to COMSOL, i'm trying to simulate the thermal stress response of a small Si [100] chip cooled down to 100mK, with a pulse heat source on a certain point/domain. The model is as...
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