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Pipe 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...

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Cavitation in thin films

Relating to this topic from 2011: www.comsol.com/community/forums/general/thread/22758 Are there already tools available within Comsol to investigate cavitation effects in thin fluid films (such as...

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Heat Transfer

Actually, I need to give boundary condition to one of the part of my system. At that part, I will use cryocooler of capacity 1 W at 4.2 K, how can I give this boundary condition to particular part. My...

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Poisson-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...

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Question 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...

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charged 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...

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Mixing 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...

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Fluid-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...

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NACA 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...

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Multiple-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...

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Heat Transfer

Actually, I need to give boundary condition to one of the part of my system. At that part, I will use cryocooler of capacity 1 W at 4.2 K, how can I give this boundary condition to particular part. My...

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Linking 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...

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Simulation 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...

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Unusual 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) -...

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Cooling 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...

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failed 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...

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Heat 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...

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Measuring 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...

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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...

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Pipe 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 Article
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