Stationary / time dependent solution differs
Hello everyone, my model is a U-shaped pipe in a concrete block. Cold water (1°C) flows through the pipe and the warmer concrete (11°C) surrounding it warms up the water inside the pipe. I used the...
View ArticleModélisation des écoulements à travers un barrage en terre
SVP , est ce qu'il y a quelqu'un qui peut m'aider à modéliser les écoulements dans un barrage en terre homogène sous COMSOL multiphysics. Ci attaché le model Le niveau de l'eau se trouve à 13 m de...
View ArticleA time-dependent Free molecular Flow study
Is it possible to do a time dependent simulation incorporating free molecular flow physics in a reasonable amount of time. A stationary study is pretty fast to converge, but the time dependent study...
View ArticleCooling Towers
Can we input humidity for simulating cooling tower on COMSOL 4.3a? Can you help me with amy examples, if any??
View ArticleShallow-channel approximation with wetted wall in Laminar Two-Phase Flow
Hello, in earlier versions of COMSOL (eg. 4.1) it was possible to define a wetted wall boundary condition simultaneously with shallow-channel approximation in the two-phase flow physics. However in...
View Articlemagnetohydrodynamic model
Hello. I learned that the latest version of Comsol-u is magnetohydrodynamic model. He was someone kind enough to send me this model? Thank you.
View Articlethermal model
Hi everyone, I am working on a thermal model and used conjugate heat transfer for simulation. My problem is when i want to calculate the thermal efficiency of the flowing fluid (cooling) by identifying...
View ArticleHow to add gas velocity in turbulent bubbly phase?
Hi, I am trying to model a gas-liquid system. I selected turbulent bubbly flow model as it is based on Euler-Euler equation. But I don't know how to add gas velocity field at inlet. Liquid phase in my...
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 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 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 ArticleHow to Improve Convergence in Natural Convection
I am wondering how I can improve convergence in my natural convection model. It is a simple model; an isothermal aluminum plate in water. The model starts out fine but as the run continues (transient...
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 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 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 ArticleCavitation 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...
View ArticleSimulation of Stirling Engine
Hello everybody I'm currently trying to simulate the fluid flow in a stirling engine (beta) which I've built from the following video:www.youtube.com/watch?v=X2qssmxA82U You should try building it;-)...
View ArticleStationary / time dependent solution differs
Hello everyone, my model is a U-shaped pipe in a concrete block. Cold water (1°C) flows through the pipe and the warmer concrete (11°C) surrounding it warms up the water inside the pipe. I used the...
View ArticleModélisation des écoulements à travers un barrage en terre
SVP , est ce qu'il y a quelqu'un qui peut m'aider à modéliser les écoulements dans un barrage en terre homogène sous COMSOL multiphysics. Ci attaché le model Le niveau de l'eau se trouve à 13 m de...
View ArticleA time-dependent Free molecular Flow study
Is it possible to do a time dependent simulation incorporating free molecular flow physics in a reasonable amount of time. A stationary study is pretty fast to converge, but the time dependent study...
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