On microstrip impedance computation
Hi everybody, I'm a very beginner COMSOL user, I started just some few days ago with the 4.3a version and I need to build some microwave sensor models. I started trying to realize some very simple...
View ArticleScattering boundary condition and port with plane wave
Dear all, I want to simulate the periodic nanostuctures on silicon. now i am using comsol 4.3a version which is not supported PML with port boundary. for that i need to define the Scattering boundary...
View ArticleDefining dispersive material
Hi, I need to define a material that has Eps Real = 1 and Eps Imag = 2 at 0.1 GHz. How do I fit a 1st order model for this material? I have uploaded a screenshot of the dispersive curves for this...
View ArticleConcentrated Chemical Species
Hello All, I am in trouble defining the constraint for the dependent variables (mass fractions) in Concentrated Chemical Species physics. I have the mass fraction of Species A to E and one inert (total...
View ArticleGeneral question regarding dimensionality in Comsol
Hi, I'd like to ask a question about mixing problems of differing dimension in Comsol. My interest in this question comes from electromagnetics, but I think it could be useful in many areas and I...
View ArticleRegarding structural mechanics module
Hi all, I can see only solid mechanics and poroelaticity in structural mechanics module in add physics.Can i add more modules to structural mechanics module.If so ,please tell me how to do it?
View Articlemagnetic concentrator
Hello, I work on a cold crucible for the fusion of silicon with a coil around (around 10 kHz). I have done a 3D model of the crucible to know the efficiency of the crucible (how power is transmetted to...
View ArticleLooking for someone with comsol experience for a comsol job
I need some comsol models to do in the next month. I don't have the time and experience to finish all so I am looking for some help. This is like a job project if someone is interested. The simulation...
View Articlejava.lang.RuntimeException: Expression is not consistent with previous one
Hello, I am new at comsol and at the moment am having trouble generating solver sequences from a study in a RF module of Comsol 4.0. I have defined a simple geometry which can be varied by Parameters...
View Articlehow i can to calculate the electrostatic force and couple it to two phase...
hi i want to Simulate Heat Transfer Coefficient and Hydrodynamics of Single Droplet Affected by Electrostatic Fields. how i can calculate the electrostatic force and couple it to two phase flow- level...
View ArticleAC heat generation
Hello, I try to convert the “Hepatic Tumor Ablation” from the Comsol library, which uses DC current and Bioheat transfer, into AC current and Bioheat transfer. Until now the electric field distribution...
View ArticleBH Curve as function of normH and T
Hi, I'm study the induction heating of a billet and I'd like to implement a BH curve as function of normH and the temperature. I have an analytical formula for that where I compute the normB as...
View ArticleVelocity Profile with Gas Absorption or Combstion
Dear all! I am wondering if it is possible to link the velocity profile of a gas flow to its concentrations, or partial pressures. For example, if you have 10% NH3 in air and you're scrubbing it with...
View ArticleParametric Cutlines and Exporting of Data
Hi, I am currently solving a parametric sweep problem where I am varying a geometry parameter. I wish to create a cutline on the geometry which depends on this. Currently I have my cutline defined with...
View ArticleSolving a system of coupled PDE
Hi, I try to solve a system of coupled PDE with Comsol. Unfortunately, I have problems to choose a suitable solver. Details of my question and a model file are attached. I would be very grateful for...
View ArticleIncorporating Lagrange Multipliers
Hello again, Thanks to the help of those on the forum I was able to incorporate weak constraints to get accurate flux calculations in my diffusion models. However, I am trying to understand how exactly...
View ArticleHeat transfer through a helical structure.
I am currently working on a model where I am trying to estimate the total heat gained by a cold liquid passing through helical pipe with a rectangular cross section which is being heated by a gas...
View Articlesoil 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 Article3D and 2D integration from the walls of a cylinder
Hello, I need to get integral from the surface of a disk and the walls of a cylinder in 2D and 3D geometries. I am fine with getting integral from the surface of a disk in 2D axisymmetric geometry and...
View ArticleIs it possible to input non-isotropic thermal expansion coefficients for...
I am using Comsol for a small project using solid mechanics physics and was wondering if I could define a coefficient of thermal expansion as diagonal instead of just isotropic for a hyperelastic...
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