WARNING: The relative residual is greater than the relative tolerance.
Dear all, I am doing an eigenfrequency analysis of a free thin layer (0.5x21cm) using the Structural Mechanics Module 4.0. I am working in the physics of solid volume with a very fine mesh (maximum...
View ArticleOptimization 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 ArticlePossible to export the streamline coordinates?
Hi, I am only using the laminar flow conditions, I have plotted the streamline after the simulation, is there anyway to get the streamline coordinate from the simulation? I like to export it if it is...
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 Articlemodelling elatic-water interface in Solid Mechanics model
Dear all, I am trying to model a cylindrical phantom which is placed in water under acoustic radiation force. The acoustic radiation force is loaded as a 'body load' which works fine. However my...
View ArticleBending Loss Calculation Procedure For Photonic Crystal Fiber
Hi, I am a new user of Comsol Multiphysics version 4.2. My undergrad thesis topic given by my supervisor is about bending loss calculation using comsol.please help me with the guideline how can i make...
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?...
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