Polymer viscosity model about Cross-WLF eqaution
Hello, I have tried to analyze the filling pattern of polymers in injection molding process with COMSOL software. And I tried to apply the shear viscosity of the polymer to the analysis using cross-WLF...
View Articlestructured mesh around cylinder
Hi Comsol Community, I try to set up a Comsol simulation for a fluid flow around a cylinder and I want to use a structured mesh. Is it possible to create a structured mesh around the cylinder (e.g....
View ArticleStrange issue with laminar flow level set method
Hi, I recently started using the laminar flow level set method to simulate the motion of water in a partially filled channel as air flows above it. The simulation runs well when the distance scales are...
View ArticleNo flow or Symmetry for boundary condition?
Hello Comsolers, I have simple question: what is the difference between No flow and symmetry boundary condition? when we choose No flow and when we should choose symmetry as boundary condition? Hope to...
View ArticleError in DEP simulation-Help
Hi All, I m getting simulation error while simulating DEP based separation.I choose particle tracing with time dependent study, I m able to simulate for laminar-starionary, electric field-stationary.....
View Articleindividual shape function under "weak form PDE" ??
Hi everybody, I use "weak form PDE" within the "math mode" for solving the Navier-stokes equation. I use 2D within xy-world. Basically it works, though the linear part of the solution does not really...
View ArticleError "cannot create geometry from incomplete mesh"
Hello, I am using the fsi module with a 2d geometry, its a circle in a laminar flow. Everything goes fine for the first 0.5s oft the simulation, but after the 45th automatic remeshing the error "cannot...
View Articleelectroosmotic velocity BC and reaction force
Hello comsol community, I am working on a model for fluid flow around a circular cylinder(similar to the tutorial from the comsol model library). In difference to that I am applying the electroosmotic...
View Articlehow to set two types of particle properties in fpt physics
i study two different types of particle movement in particle tracing for fluid flow how to set these particle properties i cann't find like particle properties 2 on the physics toolbar and i tried to...
View ArticleAxisymmetric model
I use electric current and laminar flow modules to study the flow generated inside micro droplet due to electric field. How to apply boundary condition for droplet surface so that the flow can't flow...
View Articlemoving heater
Hi, I am trying to model heat transfer to a fluid flowing in a rectangular duct. The duct is heated at the bottom wall through a rectangle step function such that only a short length of the wall is...
View ArticleRegarding solving drift-diffusion equation in Comsol
Dear Mr Gritter I have come across your post in the Comsol forum about implementing a drift-diffusion equation using the PDE interface in Comsol. You mentioned that the drift-diffusion equations need...
View ArticleValidation of fluid structure interaction?
Dear all, Do you mind to share if there are some standard/ simple validation examples/experiments of fluid structure interaction (FSI) used to validate simulation results? Just like we often used...
View ArticleCoupling of two laminar flows
Hey, I'm trying to solve a system where I have an aqueous phase flowing over a well filled with an oil phase. Flowing aqueous phase will cause convection in the oil phase. I've tried to implement this...
View ArticleProblem setting up multigrid
Dear all, I'm building a 3D CFD model of a airplane wing. I'm modeling turbulence with the SST approximation. The problem is that when I build a default mesh the results are not accurate enough to got...
View ArticleConvergence problem according to the flow rate speed
Dear, experts. I try to simulate heat transfer from pipe to solid. Water flows inside the pipe with constant inlet temperature. Pipe flow module (Non-Isothermal pipe flow) is used and flow rate is...
View ArticleComparing Analytical solution to comsol Solution
Hello comsolers, I defined a 2D model in subsurface flow model-using richards' equation for simple rectangle (226*1.2 meter) with imposing upper BC inward flux (because of rainfall) in homogenous, and...
View ArticleFree Convection - General Modeling
Hi, I'm new to Comsol and i'm trying to model free convection in a prety large domain. I've realised the model in 2D and it has about 1 square meter and in 3D it has about 0.5 cubic meters. I'm using...
View Articlelooking for tutorial
Hello! I am getting started with COMSOL for my masters thesis project. I need to extract the hydrodynamic coefficients of a large offshore platform- I thought I might simulate the platform in COMSOL....
View ArticleDomain-dependent material properties?
Hi I am trying to simplify a 3D-->2D model for a creep flow/ transport problem. I have a screenshot of part of the model attached. What I am trying to do is to define the material (water) dynamic...
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