rigid particle carried by a channel flow
Hi I have to simulate the displacement and rotation of a rigid prticule in a fluid flow and I am not a professional on comsol. So, is there anyone who could help me? or if you have any examples of this...
View ArticlePipe flow module / Falied to evluate variable Jacobian
I am working over a simple pipe flow problem, where I encountered with an Jacobial Error saying ; Failed to evaluate variable Jacobian. - Variable: mod1.nipfl.u3 - Geometry: 1 - Boundary: 7 10 13 I...
View ArticlePoisson-continuity coupled equation
Hello, I try to model the corona discharge in wire-cylinder geometry governed by the equations: nabla (V) =- rho/epsilon0 (Poisson equation) and grad (rho) * grad (V) = rho ^ 2/epsilon0 (equation of...
View ArticleQuestion about Nernst-Planck Model
Hello, I'm a new user for Comsol 4.2. When I applying the Nernst-Planck model form my work, I added 5 species, c1,c2,c3,c4,c5 which zc1=+1, zc2=-1, zc3=-3, zc4=+1, zc5=+1 and set the 'from...
View ArticleCFD Boundary Conditions for Journal Bearings
Hi all, I have recently started working with Comsol. It seems very easy to use and so far I was able to build my model and have the basic physics working. I am trying to build a journal bearing model...
View Articlecharged particle deposition
Hi all, i'm trying to model (3D) an electrodeposition of nanoparticles under laminar conditions (fluid flow), but i've no idea....which module i should use. I'm using the comsol version 4.2a. any idea...
View ArticleMixing two different fluids in fluid flow
Hi I have been working on a flow analyzer that has two inlet and an outlet. I have two fluids, one is very dense and the other is a very dilute substance, both of them are completely different and they...
View ArticleFluid-Porous Slip boundary conditon
Hello, I focus now on the flow and solute transportation simulation in the free flow and porous media. There are traditionally one singe formulation, typically Brinkman and two-domain coupling with...
View ArticleNACA 0012 Airfoil with Spalart-Allmaras turbulence model
Hello, I am new to COMSOL and I thought I would start with a relatively simple model: a NACA 0012 airfoil at 0 angle of attack. The domain is small and the mesh resolution is relatively coarse to get...
View ArticleMultiple-size particle tracing
Hello everyone I have a short question on the particle tracing module. Does anyone know that whether it is possible to simulat particles of different sizes in the same model. How to implement this...
View ArticleLinking a Porous Media Flow to a Transport of Concentrated Species
Hello, I have created a chamber that has sugar water running through a compartment and carbon cloth modeled by a free and porous media flow physics. I also want to create a transport of a concentrated...
View ArticleSimulation of an hydraulic accumulator for pulsation reducing
Hello COMSOL community, I am trying to do a transient simulation of an accumulator in a hydraulic circuit. For simplification, the accumulator shall be placed as a bubble of a second fluid domain...
View ArticleUnusual condition between two fluids
Hello, i`m new here, then sorry if this is a silly question... I need to set the follow condition in the interface between two fluids: ro_v*u_v*hfg = ro_l*u_l*hfg = lambda_v*(dTv/dx) -...
View ArticleCooling of a metal box
Hallo to everybody! I'm trying to realize the simulation of a metal box (fillled with air and including an heat source, and surrounded laterally by other boxes that I consider through the...
View ArticleIs there a way to do a temperature dependent heat source in Conjugated Heat...
Hi I'm working in the conjugated heat transfer physics and I'm hoping/wondering if there is a way to make the heat source temperature dependent. I have a cable that is covered with different materials...
View ArticleThin liquid film with thermal gradient in contact with air (tpf, ht, ALE, AMR)
Dear all, I am modelling a thin film liquid in a rectangular channel (2mm), as well as the air on top of it. At the initial condition everything is within room temprature (Tc) then one side of the...
View Articlefailed to evaluate jacobian in using velocity field in fluid particle tracing
Hi, I have tried to edit drag force's equation view in fluid particle tracing(fpt). COMSOL for example, uses "model.input.u1-fpt.vx" for relative velocity in x direction but when i use it in my...
View ArticleHeat transfer from the pipe to surroundings
Sir, We found three options for "Wall Heat transfer" in "Non-Isothermal Pipe Flow" namely 1. Temperature (nitf/nitf) 2. Temperature (nipfl/nipfl) 3. Userdefined. (with an option to check "Take average...
View ArticleMeasuring the temperature at a point
Sir, In a non-isothermal pipe flow model, we have specified wall heat transfer with external temperature as 293.15K and the check box for taking average from adjacent domains is also checked. After...
View Articlerigid particle carried by a channel flow
Hi I have to simulate the displacement and rotation of a rigid prticule in a fluid flow and I am not a professional on comsol. So, is there anyone who could help me? or if you have any examples of this...
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