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Fluid flow and heat transfer in heat exchanger
Dear All, I am solving a conduction- convection heat transfer problem with 2 dimensional in shell and tube heat exchanger. Problem Description are as: The size of inner radius of tube is 6mm. and outer...
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mesh problem
Hi I am using Comsol, heat transfer module. My geometry has a thin layer inside a box. I used swept mesh for thin part however for all box I used Tetrahedral. But when building mesh I got the error of...
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Reactive transport of two species
Hi, I have two streams of water flow into the same conduit under laminar conditions where they mix by diffusion. Flow is from left to right and compound A enters at the top half, whereas B enters along...
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Symmetry in heat transfer with surface to surface radiation
Hi Comsol Users, I'm working on a 3D model with heat transfer and surface to surface radiation, in which I make use of symmetry and calculate only one quarter of the problem. So I choose symmetry and...
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CPW with Resonator
Dear Community, I've been trying to set up a model of CPW with a split-ring resonator (SRR) for quite a while now. Sadly, without much success. I've also tried to alter a couple of the related problems...
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COMSOL 4.3b crashes suddenly
Hello all, I've been using the software without problem for about a week. Recently a model I was running (using solid mechanics physics) was taking too long because I had too fine a mesh. I tried...
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Material property dependent on solution variable
Hi, I'm trying to solve a 1D flow problem with Darcy's Law. The permeability of my material is supposed to be dependent on the pressure gradient in the medium. So I would first have to create a study...
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Electrostatic Spring Softening in MEMS structures [ resonator Beams]
While I run "electromechanics" module for a MEMS resonator beam, I select "Prestressed analysis Eigenfrequency". Now my question is whether COMSOL considers the Electrostatic Spring Softening which...
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Thermal expansion of a fluid or gas - how to model ? (renewed)
"How is the intended method to calculate thermal expansion of fluids or gases?" ...... is my whole question in short words Someone asked this years ago, but no answer was registered. see...
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mutual inductance in 3D
Hi There have been some posts on this issue but no clear resolution to the problem. Say we have 2 randomly shaped coils at random 3D orientation. Find mutual inductance with 1% accuracy. One method...
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RF domain -> EM waves -> Eigenvalue -> Magnetic field plot?
Hello, I have a problem in plotting (or even calculating?) magnetic field in a simple structure and I am using Comsol 4.3a. The structure is a cylinder shape shield (perfect conductor) and inside is a...
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From a NifTi Brain Model to COMSOL Bioimpedance simulation
Hi, I have got a model of the brain from MRI images, the segmentation is done, what I need is to create a mesh that can be imported in COMSOL Multiphysics, I already have the materials and their...
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3d elasticity
Hello! I need to simulate structure like a mattress: 2 surfaces connected with periodically distributed thin rods, 3d elasticity problem. When building geometry following question arose: whether it is...
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COMSOL incapable to calculate static pressure in a confined fluid?
COMSOL incapable to calculate static pressure in confined a fluid volume and its interaction with the confining container walls both resulting from differing thermal expansions ? I'm a bit surprised,...
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switching electric AC voltage
Hi, I'm rather new to COMSOL. Is there a way to model a switching AC field between two electrodes? That is, both electrodes are always applying an AC field of the same frequency, but one side is high...
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Non-Isothermal flow module issues
Hi, I am trying to model a single channel of a typical pressurized water reactor, considering three physics, the point kinetics model for the calculation of energy generated inside the fuel pellet, the...
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3D Mesh refinement within a domain
Sorry to ask such a basic question, but how do you refine the mesh for a specific region (not an entire domain) in 3D. I cannot get 'Mesh Control Domains' to work for me, but i think this would be...
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Transmition Coefficientof Electromagnetic Wave in Frequency Domain
Hi, I am doing a simulation of free space. My Comsol version is 4.1 My goal is to find transmission and reflection coefficients in order to determine phase of reflection or transmission. I know how to...
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How to make reliable domain selections in a parametric model?
Hello, I have created a model using the JAVA API. The whole model is fully parametric. If the parameters are changed reasonably, the topology does not change. The model contains named selections to set...
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Mirror temperature field on x,y-plane (General extrusion coupling)
Hello, I would like to simulate a stationary heat transfer problem in a first step and the Eigenmodes (with the pressure acoustics modul) in a second step. Because the heat transfer problem is...
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