Relative permittivity of gold
hello all, i am working in 4.3 comsol and i have a problem with the material part, that i need to work with gold or silver in my geometry but after selecting the sub domain parts that i need it to be...
View ArticleSymmetry
Dear all, sorry the continuous questions today! I am going to use symmetry for the geometry as in the picture I attached. The simplified geometry is a multilayer (only the green part) composed of...
View ArticleUnknown heat source in heat transfer-laminar flow coupled model
Hi all, I am modeling a volcanic conduit (5 m wide) moving up through a "host rock." I want to analyze the thermal budget of this situation. The conduit is a rectangle (Heat Transfer in Fluids, Laminar...
View ArticleConnecting materials
I am trying to connect two separate domains, composed of different materials. What kind of boundary conditions should I impose to achieve it? Thank you.
View Articleconservation condition for rate equations (PDE)
I'm trying to model a structure with the RF module (time dependent) coupled with a system of differential equations that describes the rate equations of atoms populations in different energy levels...
View Articleline graph of surface integral
Hi My model is a cylinder (3D) axis is in z direction. I can get a surface integral of a variable (eg volume force) in any xy plane. I now wish to display on a line graph, the variation of this xy...
View ArticleThermal Stress Evaluation without Solving Heat Transfer Physics
I am trying to generate Thermal Stress about the domain of a spherical body with a coupled 'Solid Mechanics' and 'Heat Transfer in Solids' physics. Instead of actually solving the heat transfer...
View Article[SOLVED] "Solution not initialized" when using Livelink for Matlab
(Documenting for others' possible benefit.) This error happened: ============================================================ Error using com.comsol.model.impl.SolverSequenceImpl/getPVals Java...
View ArticleSolution isn't converging
Hello everyone, I'm having a problem with my simulation, where it isn't converging. It's a very thin plate (10 nm) of graphene, and the dimensions of it are around 0,5 um. I've made a simulation where...
View ArticleAC Electrical Field simulation in interdigit structure
hi I want to do AC filed simulation for interdigit structure. I am wondering what kind of physics should I select and how I can apply AC signal to my structure? I would appreciate any help
View ArticleIssues with Full Coupling of Physics
Good day, I am having issues with fully coupling two physics. My system contains the solid mechanics physics coupled with a general form PDE to model concentration change and the diffusive properties...
View ArticleEvaluation of Volumteric displacement
Hi all, I am modelling a diaphragm deformed under pressure loading in an axisymetric model. I was wondeing if there is a way to evaluate volumetric displacemnt of the diaphrgam due to displacement....
View ArticleParametric sweep
I have a range of angles set as parametric sweep ie range(0[deg],0.1[deg],4[deg]) And also I have a study in frequencies with range(2[THz],0.1[THz],5[THz]) When it solves it puts them all together in...
View ArticleContinuous microwave oven with a conveyor belt system
Good afternoon, I simulated a continuous microwave oven with a conveyor belt system in COMSOL version 4.1. For this propose, I used the moving mesh algorithm. I tried to do the same in 4.3a version and...
View Articlecomsol default solver parameters
Hello all, I am generating a matlab-script based comsol model and want to be able to run it from within Matlab. I am simulating a time-dependent study of a vibration problem. From my understanding of...
View ArticleDoes Far-Field Calculation with 2-D Fluoquet Boundary Condition make any sense?
Dear Community members, I was using Background and Scattered Field method simulating an infinite 2-dimensonal array, and the result matches almost perfectly with our experimental results. We wanted to...
View ArticleFSI Modelling Capabilities?
Hi all! I am modelling a tube which acts as hyperelastic material. Inside the tube there is a fluid. Third object suppose to push this tube in one direction. Tubes edges are constrained. The problem is...
View ArticleElectron/hole generation within an thin solar cell film
Hi there, I'm trying to simulate charge carrier generation within an organic solar cell thin film now (assuming the film is homogeneous). I'm using only three equations now, 1. electron drift-diffusion...
View Articlemodeling dispersive materials at optical frequencies for nano-antennas
Hi all, I'm going to model some nano particles at optical frequencies and I want to use the the refractive index (complex permittivity) given by Palik or Johnson and Christy. In their papers, the...
View ArticleSolid Mechanics - Linear Elastic Material - Thermal Expansion
In the solid Mech - Linear Elastic Material - Thermal expansion node, there are two tabs: Model Inputs & Strain reference temperature, which both contain places to write temperature values. What is...
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