switch off saving of recovery files in Matlab code
Hello community, I am running Comsol through the Matlab interface. My problem is that the directory assigned to the recovery files is to small to save them which terminates my calculations. I would...
View ArticleRecoverable error in residual, but solver could not recover.
Recoverable error in residual, but solver could not recover. What is the meaning of this error ?
View ArticleStrange numerical_error says "yPlusaMulx: y and x does not have the same length"
I have a strange error message on simulating my model in Comsol, as follows: Error: Time 1.339427726604487e-005: Nonlinear solver did not converge. Internal_numerical_error yPlusaMulx: y and x does not...
View ArticleCurrent in Induction heating (Peak or RMS)?
Hello, When solving using the Induction Heating solver, can anybody confirm if the "Current Excitation" in the "Coil Group Domain" is peak or RMS? I have a suspicion that the value to be specified is...
View Articlecome across such a problem
I use the PDEs module to make simulation of my model, but I just encountered with a few problems of which is undifined value in the stiffness matrix. I make sure that I have already defined all the...
View ArticleExtracting Mass and Stiffness matrices
Hello everybody I have installed COMSOL 4.3 yesterday, so I am still finding my way through it. I made a model of a cantilever beam using 3D/Structural mechanics/Solid mechanics (solid)/Eigenfrequency....
View Articlegeometric parameter sweep
Greetings everyone, I'm running some stationary simulations using the MEMS module. I would like to make a parametric sweep for a certain geometric variable. The problem is that when changing this...
View ArticleCriteria for Extracting a 2D Slice Data from a 3D model
What is COMSOL's criteria when I extract slice data from a 3D gridded model? Is it simply finding the nearest node points? If so, is it only including node points immediately adjacent to the slice...
View ArticlePiezoresistive Beam
Does anyone here uses Piezoresitive module for modeling a piezoresistive beam? Or has any example which s/he can send for me? I am really confused about the results and I need to take a look at one...
View ArticleCombining particle tracing and rotating machinery modules
HOw do I combine the particle tracing and rotating machinery modules so that they can run simultaneously in a study? I am attempting to study the particle trajectories in a 3-D mixer (the same mixer...
View ArticleStationary study of a beam immersed in water
Hello Everyone, I am trying to analyze stationary behavior of a single-crystal silicon cantilver beam which is immersed in water. To do this, I have used Fluid structure interaction module. I apply a...
View ArticleSolution at angle (phase) in RF module background field / scattered field...
Hi, I'm using the background field / scattered field formulation to do RF frequency domain simulations. Basically I have two steps. In step 1, I use a port to generate a planar EM wave. My simulation...
View Articlemodelling of air in transient analysis
Hi, I am using pressure acoustic and AC-DC Modules together. In time-harmonic analysis it can be possible to model PML and infinite elements, however it is impossible in transient case. To check the...
View ArticleComsol on-screen font
Dear Comsol users Is it possible to increase the Comsol interface on screen font size? Thanks for hints.
View ArticleHow can I monitor the maximal memory used during simulation?
Hi all! I'm running some simulation on a cluster and the simulation takes quite a while. So it's not possible for me to stare at the screen to see how much memory (the maximal value) is used by the...
View ArticleWhy does 3D simulation cost so much memory?
Hi, all For 2D, several millions DOF cost less 50G, however for 3D only 1 million DOF will cost more than 100G. I understand the consumed memory is proportional to DOF. But the coefficient should be...
View ArticleIs it possible to give a defined constant as the last value for the time-dep....
Hello, I have a model with sinusoidal varying variables as a function of time and frequency. So when solving the model with the time-dependent solver, I would like to give for the last value in the...
View ArticleNon active PML domains
Hi, I have made a model for thin film bulk acoustic resonator. I have problem with the PML domains. my model has two physics: Solid mechanics for PML domins and Piezoelectric devices for remaining....
View ArticleHow to check mass balance?
Hi, I was wondering if there is any way to check the mass balance in Comsol? It's kind of hard and time consuming to calculate the mass balance by hand, so does Comsol provide it for users by default?...
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