swept mesh
I am trying to simulate T-junction conduction-convection fluid flow. I am using swept mesh with rectangular mesh. When I start solver the solution progress becomes very slow and the computer seems to...
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 Articleresidence time distribution in laminar flow comsol 4.2
Hi there, I am new in using Comsol and I am trying to obtain residence time distribution by Comsol, I used fluid flow-single phase flow-laminar flow from Comsol model wizard to model flow between two...
View ArticleHow to use the output (solution) of one boundary in a model as the input...
Hi, everybody! I have a question about the boundary settings in the CFD module. I built an open channel and calculated the fully developed turbulent flow. Now I want to build another channel, which has...
View ArticleDielectrophoresis
Hi there. I tried to observe the particle movement effect through the "particle tracing for fluid module". However, the result of particle trajectories didn't show up any particle movement. Please...
View ArticleMass flow unsymetric matrix error
I am trying to do simulation of turbulent flow through a valve. I have a problem that the pressure variable seems to become unsymetric as soon as I have flow through the inlets of the valve. I am able...
View ArticleTime dependent boundary
Hi all, I have flow through a cylinder, and want the inlet velocity to be periodic [ u(r,t) ]. Im new to comsol and havent been able to find an answer to this. Thanks in advance for any help!.
View ArticleProblems with parametric sweep
I have a model that I want to investigate with differens values on at least one of the design variables. If I change the variables value manually and compute, there is no problem but if i use variable...
View ArticleTube diffusion
Hello all, So I have flow through a cylinder, and want to inject some sort of dye into it. I made a cylinder, and then extruded a circle on the edge to simulate the injection point where I will have...
View ArticleNavier-Stokes Simulation using Coefficient Form PDE
Hi: I need to simulate fluid flow in a triangular duct, but I need to run it on a high reynold number. The problem is that when I run the model using the default "Laminar Flow" physics tab, I need a...
View ArticleNavier-Stokes Simulation using Coefficient Form PDE
Hi ivar! I don't bother with my question, but I'm in troubles and I know very expert in comsol, so I turn to you. I hope you can anwer me. I have this problem: How to solve a nondimensional set of...
View ArticleNavier-Stokes Solver
Hi dear Jorge Concepcion, Please find attached the model you are working on. (seems working) I have implemented your equations and set your geometry. I have done a test with your BC, it seems that you...
View Article2way FSI simulation - deformation of pipe due to sinusoidal flow ...
Hello, I'm going to model a simple artery , here is the model definition: =========== Model data =========== A cylindrical artery with 10mm radius, 1mm thickness and 80mm length is considered with...
View Articlescales for dependent variables in laminar flow module
Hi guys, Scales for dependent variables: mod1.u: 1 mod1.p: 2.3e+002 mod1.spf.Pinlinl1: 8e+007 When I apply inlet condition with normal inflow velocity, there are only mod1.u and mod1.p, so no problem....
View ArticleFluid Structure Interaction -- Convergence Problem
Hello, I am working with the FSI module and I am trying to model an oscillating plate in an infinite expanse of fluid. I have successfully used the "sliding wall" boundary condition to do this, but...
View ArticleSetting the permittivity of particles for dielectrophoretic force in Particle...
Hello, I encountered a problem while setting up fluid model with DEP force. Direction of DEP force is dependent on the Claussius-Mossoti factor, i.e. complex permittivity of the particles and the...
View ArticleUsing 3D model data as input for 2D model
Hi Everyone! I have a 3D model with coupled flow and electro-chemistry equations. The equations are weakly coupled, so I know from previous experience that I can run the flow and electro-chemistry...
View Article2D structure rotate problem
Hi, The question arises from the model "micromixer_particle tracing" in the Model Gallery. (Rotating Machinery, Laminar Flow)The impeller revolution per time is rotating at 1/s (constant velocity)....
View Articlewhat's different between 'frequency domain' and 'frequency domain,...
Hello guys I'm simulating a cantilever sensor, which contains three modules, 'laminar flow', 'electric currents', and 'particle tracing in fluid flow'. For this, in electric currents module, AC...
View ArticleUsing a function for Permeability value
Hello! I am new to the software. I am modeling fluid flow through the annulus of a pipe coupled to a porous media and am using the Free and Porous Media Flow physics interface. The permeability of the...
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