Optimization Module : Using design variable of previous iteration
Hello, I am using Optimization Module and having some difficulties. I want to use the values of design variable of previous iterations (n-1, and n-2). In other words, can I store the values of design...
View ArticleSpring Constant and Pull-down voltage calculation for MEMS Fixed-Fixed Beam
Hi, I'm new to COMSOL, I had tried models already given and now imported geometry from other CAD software into COMSOL. Please briefly explain me that how can I calculate Spring Constant, k and...
View Articlethe unit of volume flow
Dear sir or madam, I have a problem about the unit of volume flow. I know the standard liters per minute (slm) is widely used in industry. So do we use this unit in comsol? For example, if I give 20...
View ArticleHow to deal with Contact problems, Adhesion!!
Hello Everyone, I am dealing with the topics of contact mechanics and adhesion. In my case, two surfaces are adhered strongly and I would like to model the detachment of contact or treat it as a crack...
View ArticleSetting boundary condition for transient modulation of a sector of electrical...
Hi all, I was able to solve a sector of electric machine in static condition. (Full machine is 8 pole I want to solve it for 2 pole) However in transient simulation ( I mean moving rotor). The field i...
View ArticleSector symmetry on a 1/5 3D electro motor
Hi All, i have a 3D model that shows only 1/5 of whole motor. It has 3 phase and 5 pool pairs. i'm using rotary machinery modul 3D. if i disabled all continuity BC on the outer slice surface, it...
View Article[Please help] Magnetic-structural coupled analysis, result not good,model...
This is part of my thesis. I'm trying to simulate the magneto-structural coupled analysis on a magnetic gear. The attached file is partial of the model. If you have any advice, please see the model and...
View Articleheat transfer coefficients
I'd like to know more about the heat transfer coefficients present in the material library. I see that it depends from the surface temperature, from the temperature at infinite distane and from a...
View Articlecopy of part model
Hello. I have two models. And I wont part of one model transferred to a second model. For example, setting drift Difusion DD. Is it possible? And if yes how? Thank you.
View ArticleEigenfrequency of Piezoelectric shunts
Hi, everyone Recently, I try to utilize the coupling modules (Piezoelectric Device+ Electrical Circuit ) to evaluate the eigenfrequency of piezoelectric shunting system. However, I come across some...
View ArticleUsing analytical expression
Dear all I have a question about analytic function, as I see for example as a default for air : It is used "rho" for "density " of material Then it is used in analytic function : "argument: pA" and...
View Articlevariable parameter in function
Dear all In my simulation I set my conductivity as a parameter of V (VOLTAGE), I use analytic functions to do that , like this: 1: (((abs(Vupvoid[V]-Vdownvoid[V]))>2000)*1)+1e-15 It means that when...
View ArticleGraphene in COMSOL?
Hi, I need to build a graphene sheet (for both 2D and 3D geometries) on an underlying substrate for simulating some experiments in COMSOL. Any help on this, as well as subsequent meshing (for...
View ArticleSimulate Joule Heating in a Wire and plot temperature Distribution
I'd like to simulate joule heating in a PVC covered copper wire in air. Then plot the radial temperature distribution across the wire and insulator. I'd appreciate any advice should it be 2D, 2D...
View ArticleOutflow BC - Concentration gradient
Dear all, I am using the Transport of Diluted Species physics. Until now I have always used "outflow" as outlet boundary condition. This means that the gradient of the concentration, at the outlet...
View ArticleApplication of different modal damping constants
Dear all, I have experimentally determined modal damping coefficients. Is that possible to use these modal damping coefficients directly in COMSOL for a frequency response function analysis?...
View Articlenon-linear kinamatic hardening
Hi all, so I am new in Comsol modelling. so I have following problem: I have to simulate a classical thermo-mechanical fatigue problem: with the thermal stress module it is for me no problem to...
View ArticleSolving multiple modules simultaneously.
As the subject states, I am trying to solve two modules simultaneously. The model is of two electrodes with a solution above them. One module is a partial differential equation in place of...
View ArticleFinding current through a surface (electrostatics model)
I have created a project in comsol 3.4 where I am have a material, with electrodes (contacts) at each end. I've created a model, and using the electrostatics model, I've defined relative permittivity...
View ArticleWork on COMSOL through MATLAB?
Hi, I would like to run COMSOL through MATLAB but don't understand how? For example when I have saved a COMSOL simulation as M-file and tries to open it in MATLAB it won't open and I am not sure how to...
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