soil plasticity in poroelasticity
I am doing a project using poroelasticity interface, but I wan to consider plasticity behavior of porous materials, so I need to use plasticity constitutive model for porous materials. How do I add...
View ArticleComsol 4.3 with Matlab - ACDC Rotating machinery - Identity Pair
Hi Comsol forum, this is the very first time I open a new thread. I want to share (and I hope to solve) the problem which is afflicting me when I try to run a time dependent problem using Matlab 2012....
View ArticleTemperature profile can't be shown
Hi Im Farah. Now im dealing with simulation for a biomass-gas stove and im focus on mixing between pyrolysis gas and air. But i have a problem with the energy balance. In this model, i have 4...
View ArticleAdding a foce to a certain limited region of a surface of the solid
Hello everyone, I have a beam , and the force is acting on the top surface of the beam , but only in a certain region. Hence, I should not select the entire top surface as the surface acting for the...
View ArticleRotation in comsol
I have a query reading thermal simulation in comsol. I want to incorporate rotational motion into thermal simulation and analyze its effect. I was able to run the thermal simulation, however when I...
View ArticleUser defined port equivalent of coaxial port
Hi all How can I model coaxial port using USER DEFINED port type in stead of directly using COAXIAL port type. Thanks in advance.
View ArticlePlot 3d result only in specific area
Hi everyone, Is it possible to plot a 3d surface data only in specific designated area? I have a 3d temperature data that has a rectangular shape and I want to plot only the upper-right area of that...
View ArticleWARNING: 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 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...
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