Limiting Dependent Variable
Hello I am trying to solve a system of PDE equations. Among the dependent variables of this system, there is a variable that changes from 0 to 1. I was wondering if I could do that in COMSOL?
View ArticleFriction Simulation
I was wondering if anyone could help me with an issue I am having regarding the Friction node in Structural Mechanics.I have a gold plate set on top of another. The top plate has an edge force applied...
View ArticleActivating Equations
How to activate equations (used in heat source) for particular temperature? And how to intepret them into the heat source (Q)400[K] 500[K] Q_sei*exp(a_sei/T[K])500[K] 530[K] Q_n*exp(a_n/T[K])530[K]...
View ArticleAC voltage
Hi! i cannot understand how to apply an AC voltage to an electrode. Could someone provide some guidance?
View ArticleDetermining Power Deposition
Hi all,So here's my problem. I have an antenna connected to a 175 W amplifier via a waveguide. It's transmitting power to a nozzle (essentially a receiving antenna) approximately 1 m away. I am trying...
View ArticleCOMSOL, structural 3D, shell elements, livelink for Matlab, mphmatrix,...
Hello,I wonder how to obtain the mass and stiffness matrices of the problem I am working with. The structural problem is modelled using 3D shell elements, with a total of 624 nodes of which 12 nodes...
View ArticleComsol 5.5 Memory problem -- with enough RAM about 512G
The below post is related to an archived discussion[start here] Hello everyone, I have a really nice machine in the lab with windows 10 server. I have Comsol version 5.5 installed. I am trying to run...
View ArticleSlot feed
Hi Richard,As you know about our RF heating project using a cavity and antenna. I am not sure how to excite a cavity by using a slot feed. could you advise me onA) how to make a slot in the top surface...
View ArticleHow to simulate Heat drives the flow of groundwater
Hi there, I hope to simulate heat drives the groundwater flow. can I use the Darcy's Law and Heat transfer in porous media ? Imagine a porous medium filled with water, where the pressure is distributed...
View ArticleConverting Composite Layered Shell Properties to Bulk Anisotropic Properties
Hi,I've created a Composite material in the COMSOL Composite module and I would like to make an equivalent anisotropic bulk material to simulate in Solid Mechanics to get a rough idea of the effect of...
View ArticleParticles pass through walls even when wall set to bounce or diffusive...
The below post is related to an archived discussion[start here] I am using 5.5 version and have the same problem. The walls are defined in the wall catagory and I have tried, without changing anything...
View ArticleERROR COMSOL WITH MATLAB
When I used Comsol with MATLAB to do optimization problems, MATLAB always iterated to a certain number of steps before an error was reported. I noticed that comsol's server was automatically shut down...
View ArticleHow To Simulate a motional current load
Hi all, So here's my problem.I am trying to to simulate a motional current load that when the material is ablated under the action of electric current, the current will be loaded on the material which...
View Article3D structural shell elements - eliminated stiffness matrix - degrees of freedom
I wonder how the degrees of freedom are organised on the eliminated stiffness matrix exported from a 3D structure composed of shell elements. The structure has no constraints, as I want the free-free...
View ArticleHanging Node in Planar Inductor Model
I have a planar inductor model and am trying to simulate the geometry coil analysis. But for some reason I'm getting the following error:"Errors when compiling equations:Inconsistent circuit setup. The...
View ArticleEddy current coil
dear sir; i'm working on eddy current testing, i'm working with two idependent coils, one for excitation an the other dor pick-up coil, but how can i make pic up coil (without excitation just the...
View ArticlePiston movement inside the tube
hi, please suggest how to model piston moment in tube. I am trying with two phase flow moving mesh. I used Navier slip at wall water boundary and normal mesh displacement for piston but it's not working.
View ArticleCoupling Semiconductor (semi) and Electrical currents (ec) physics at a boundary
PROBLEM: I am looking into a way to simulate solar cell with photovoltaic effect (occuring in semiconductor) and resistive losses (in metal contacts).Semiconductor is simulated using Semiconductor...
View ArticlePlastic deformation
Hello everybody!In a plastic perfect simulation (2D-Axial) with large deformation, the software was not be able to evaluate 'comp1.solid.Fiil22' defined as "comp1.solid. Fpi22". I searched the last one...
View ArticleTwo-phase study
I want to study deformation of viscous particles under the influence of a fluid flow, while passing through a constriction. Here properties of the particle and fluid are different. Are there any...
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