Cooling of a liquid inside a tube
Hi, all I want to model the cooling of a liquid metal inside a tube flowing under laminar conditions. Specifically I want to calculate the variation of the Nusselt number on the tube wall during the...
View ArticleMoving mesh 2D
Hello, I am trying to simulate the moving boundary for a 2D geometry. I started with a simple 2D geometry where 1 boundary is moving in the x-direction and 1 boundary in y-direction, but because the...
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 ArticleEigen frequency analysis
hi, i am dealing with a nanotube sensor...can i use eigen frequency study step to find frequency at which displacement is maximum or should i use some other study step..
View ArticleImporting
How can i import a 3D RC model from auto-cad so that it shows all the concrete and reinforcement details.? because every time i import it. it comes to comsol as a solid lacking the reinforcements..
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 Articleautomatic resmeshing
Hey, I tried using the "automatic remeshing" feature in the new version of COMSOL (4.3) and it repeatedly gives the error as "intersecting mesh elements" . Please help me resolve it. Besides, I am not...
View ArticleSetting up a previously solved physics as an initial condition for a second...
I am new to COMSOL 4.3a and I have what seems to be a simple dilemma, but I can't figure it out. I have a model incorporating three different physics. I want to run COMSOL to solve for the first...
View Articleapplication of tuning fork MEMS Gyroscope
Hello, I wanted to know the "applications of tuning fork MEMS gyroscope" which can be easily design in comsol multiphysics. An i also wanted to know the various applications realated to tuning fork an...
View Articleelectrical potentials
Hi, I´m analyzing the distribution of electrical potentials through different geometries with varying conductivities. An active electrode is firing with 1V under quasi-static conditions. To analyse the...
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 ArticleFinalizing a geometry and boolean operations
I have a fairly basic question. After creating a geometry, what is benefit of forming an Union or an Assembly? I have been solving some preliminary models without forming an union/assembly. I have...
View ArticleElectrical Field simulation
Hi, I have interdigit structure covered by gold nanostructure. Is it a way to simulate electrical field in my structure? Thanks,
View ArticleDeflection in a Membrane due to Stress
Hi Everyone, I have a circular membrane ( made of Single crystal silicon Si(c) ) of 6mm diameter and 5 um thickness. The Membrane is fixed through the sides with a residual/intrinsic/internal stress of...
View ArticleHow to define Function in Definitions / Variables.
I'm currently working on electrical simulation using AC/DC module. I define nonlinear electric conductivity for zinc oxide material using following function(ZnO) in subdomain settings, but it shown...
View ArticleMesh continuity at boundaries
Hello, I'm starting with Comsol, and I have this question, that may sound really basic to many of you. I have defined a contact pair between two parts of my geometry - an assembly. Now I would like to...
View ArticleUndefined value found // Hyperelastic parameters
Here we go again: When it comes to solving im getting anther error wich is quite frustrating. It says: Undefined value found. Detail: Undefined value found in. The equation-residial-vektor. There are...
View ArticleComb drive resonator in COMSOL
Hi, I need to use COMSOL to simulate a comb drive as a resonator. I used poly-Si for the comb drive and covered it by air. I assume that I need to choose Electromechanics Physics for my model. It...
View Articleparticle tracing module
Is there anyway to control the particle position in the inlet condition with number? example, x = 50-950um (50um apart) y= 5300um z=-50um thanks,
View ArticlePulse Volt vs Time
Does anyone has any idea where and how can I insert a time factor into the simulation? Let says I want the voltage to rise from 0 to 2V (within 40ns) --> stays at 2V for another 100ns --> falls...
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