Time dependent solver of unsteady Navier Stokes
Hi, I'm simulating flow of incompressible fluid in periodic media. I have implemented dimensionless Navier Stokes equations with Comsol PDE module. 1- I resolve my problem with a steady solver (for...
View ArticlePrediction of the critical Reynolds number
Hi everyone, I'm using Comsol for simulating fluid flow in periodic media. Do you have an idea on how can I predict the laminar/turbulent transitional Reynolds ? Thank you in advance Mehrez
View ArticleDeposition within a porous electrode
I am building a (1D) model of a battery in which an insoluble, insulating product is deposited in the pores of a porous cathode. It uses tertiary currents, with a PDE to give the deposition rate. The...
View Articlecross-section averaged fluid velocity as a function of flow direction in a...
Hi to all, I am trying to use general projection in a simple rectangular pipe, with laminar flow of water in order to plot the average velocity,(spf.U), (average in a yz cross-section) across the...
View ArticleDesigning a Micropump with a Deformed Membrane
What is/are the best physic(s) to be used when designing a PDMS micropump that has a deformed membrane? What is the best of these choices for this kind of design: 1. Solid Mechanics + Laminar Flow 2....
View ArticleMeshing problem with CFD model "Inverted elements"
Hi all, new to the forum so sorry if I'm asking a repeat question. I have to simulate the transport of a dilute species in a small fluid flow device that houses electrodes. I have to set it so that...
View ArticleRamp fuction or?
Hi, I am simulating heat transfer with fluid flow, thus I need to slowly increase my heat source to make my simulation works. Until now I've been using step function but I feel liek ramp function fits...
View Articlemoving mesh
Hi i am working on a biomedical project. now i want to study the drag and lift etc on the moving body in a liquid medium. i have implemented it by using fluid flow and deformed geometry. my body is...
View ArticleAnalysis of Melt fraction in Phase change material
Dear All, I am solving a heat transfer problem in shell and tube heat exchanger with a solid liquid interface location. In this case I am using the phase change material ( Paraffin material) in shell...
View ArticleAnalysis of Melt fraction in Phase change material
Dear All, I am solving a heat transfer problem in shell and tube heat exchanger with a solid liquid interface location. In this case I am using the phase change material ( Paraffin material) in shell...
View ArticleNeed some advice in using two mesh types in NITF and CHDS
Hi. I've been doing a 3D simulation for the past couple of months on the heat and mass transfer of some granular materials.. One domain for the fluid and several domains for the granular materials. But...
View ArticleHelp with Designing Micropumps
Hello Mr. Ivar Kjelberg, I had some questions on COMSOL, and I managed to get some answers here. However, I still have some unsolved questions that no one answered them. I have noticed that you are...
View ArticleWetted Wall BC
Hi, What are the equations for wetted wall boundary condition in COMSOL ? I can not find it. I want to know what exactly happens when you set the contact angle. Is COMSOL using the Navier Slip Length ?...
View Articleelectrospray simulation
Hi, I'm trying to simulate an electrospray experiment using comsol 4.1 in order to see the formation of droplets leaving a needle to a plate. A high voltage is applied on the needle and the plate is...
View ArticleSpecifying a rotating boundary condition
I would like to simulate a rotating wall condition. For simplicity, imagine a square box. On the top surface of that box there is a circle. Inside of the box is a viscous fluid. I would like to impose...
View ArticleAcoustic Band Structure of Metamaterials
Hi folks, I have been trying to find the band structure of an acoustic metamaterial. I have been attempting to adapt the "Bandgap analysis of Photonic Crystal" tutorial given for COMSOL 3.5a to 4.3. I...
View ArticleDEP particle tracing for fluid flow COMSOL 4.3 simulation
Hi, I've tried to simulate dielectrophoresis by using the particle tracing for fluid flow module of COMSOL 4.3, but I' ve encountered some problems with the dielectrophoresis force. I am trying to...
View ArticleFluid Structure Interaction problem
Dear all, I am trying to 2D model a solid body (circle) rotating in simple shear flow in a channel and I am using the fluid structure interaction module to try and solve it. I have followed the...
View Article3D hydrodynamic focusing for nanoprecipitation
Hello everyone, Nice to meet all of you. I have a question and hope that someone can give some advice. In my research, I want to simulate a 3D hydrodynamic focusing of a system with water (side flow)...
View ArticleAuxiliary problem on different domain
Good afternoon! I am simulating the reaction-diffusion problem in 2 domains separated by a membrane with transmission conditions on this membrane. I have 3 reaction-diffusion equations for 3 functions:...
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