Time dependent heat transfer in a thin layer
I am working on heat transfer through fluid no1-solid (thin layer)- fluid no2. The simulations is transient and the time elapsed during heat transfer from fluid no 1 to fluid no2 is relevant (actually...
View ArticleCalculation of Area over a boundary
How to calculate the area over a given boundary (a circle in 2D axisymmetric) in comsol 4.3? I am using 'Intop()' to calculate the area with '1' in the brackets. Is this way of calculating the area is...
View ArticleMean operator requires an adjacent entity of higher dimension
Hi there. I am trying to simulate my model as a stationary turbulent flow model. I cant get it to run since it keeps comming with that problem warning box: "Mean operator requires an adjacent entity of...
View ArticleImplementation of PDEs with two dependent variables
Hello, I have to model a fixed bed reactor step by step regarding species transport, heat transfer and flow for my bachelor thesis and first I want to study the flow by using the Brinkman Equations....
View ArticleNanofluid evaporation under radiation
Hello, I am new to COMSOL multiphysics. I am trying to simulate nanofluid (2% by volume graphite nanoparticles in ethyl alcohol base fluid) evaporation. I am considering just one single droplet in air...
View ArticleIssues with Multiple Types of Meshing in Model- Faces Locked by Adjacent Domain
Hello all! I've been having issues with my COMSOL project. I figured out how to add Swept Mesh (Triangular) to where I needed it, but I could not add Free Tetrahedral Mesh to the remaining geometry...
View Articlenegation concentration values when calculating convention diffusion of particles
HI all, I want to get the concentration values of particles in oil,and i am tyring to use the models of Transport of Dilutes Species（tds） and Turbulent Two-Phase Flow，Level Set(tpf) . The initial...
View Articlehow to set wall to free stream boundary condition
I'm doing simulation of the heat transfer of Fuel Cell, I have an exhaust fan on the outlet and the inlet is the hole between the stacks, due to the thousand hole of it, i would like to draw a air hood...
View ArticleCFD-Laminar Interface query
hello Instead of setting a pressure inlet to p=0 [atm] , I want to set the inlet to gradient of pressure =0 . Is this possible in COMSOL? Thank you Regards
View ArticleSimple heat exchanger model error
Hi everyone, I'm working on a heat transfer problem and could use some help. It concerns a large horizontal pipe containing an elongated u-shaped pipe (the 'loop'). The pipe contains air and the loop...
View ArticleHow to change a time steps in COMSOL 4.2a
Hi, Currently I am using COMSOL 4.2a. And I obtained simulation results for 1hr with time settings in (0,5,3600). In which: a) 0 indicates zero seconds , b)3600 seconds indicates 1hr time , c) 5...
View ArticleImpose a pressure
Hi, I have a big problem ! Fisrt of all, i use two physics : laminar flow and heat transfer. Then, my problem is about laminar flow physic. I put "0" values for v initial et p initial, i use inlet and...
View ArticleIncompressiblity in Fluid Flow
I am trying to model the flow in a tube where on either side of the tube there is a sinusoidal pressure being applied and in the middle on the side of the tube there is an outlet where the pressure is...
View Articletransformer simulation with AC/DC, HEAT TRANSFER
Hi everyone, I would like to simulate a three phase transformer in 3D with more module in the same time. The aim of my model is seeing the effect of the magnetic field (eddy current, leakage flux) for...
View ArticleI wander why Boundary Heat Source in "Conjugate Heat Transfer" cannot get...
Hi everyone, Recently, I found some question on simulating heat distribution of heat electrode circuit surrounded by air, using Conjugate Heat Transfer(,laminar) inflow model and electric...
View ArticleHow to set the viscosity of the solid material during the process of...
Hello, I major in heat storagy of PCM melting process ( solid to liquid phase ). And I have a problem in my field. Do I need to set the viscosity of the solid material as large as 1e8 Pa*s or just as...
View ArticleCenter of Mass Calculation Problem.
Hi, I have a problem with center of mass calculation. My bubble is rising in z direction as time passes, and the simulation shows that to me correctly. However when I want to calculate center of mass...
View ArticleURGENT -Running COMSOL with MATLAB help needed
Hello, This is in reference to a post : May 3, 2011 8:51am EDT in response to captainmariah Re: Work on COMSOL through MATLAB? 2. You can start a Comsol server manually (from the Comsol Start menu...
View ArticleConcentration dependent kinetics
Hey guys! I'm trying to model an electrochemical cell, where I need to use Concentration Dependent Kinetics. Here I want to use the concentration of a species at the surface of an electrode to that in...
View ArticleBrinkman equation in modeling blood flow in biological tissue
Hello, I am modeling interstitial blood flow in the tumour tissue surrounded by the normal tissue, which are both assumed to be porous media. So I use Brinkman equation, which consists of momentum and...
View Article