scaling of variables
What is scaling of variables and how does this influence the final solution? What should be chosen for scaling of variables from "manual, initial value based, automatic, none"? Thanks for the help....
View ArticleNavier-Stokes Simulation using Coefficient Form PDE
Hi: I need to simulate fluid flow in a triangular duct, but I need to run it on a high reynold number. The problem is that when I run the model using the default "Laminar Flow" physics tab, I need a...
View ArticleTime dependent solver of unsteady Navier Stokes
Hi, I'm simulating flow of incompressible fluid in periodic media. I have implemented dimensionless Navier Stokes equations with Comsol PDE module. 1- I resolve my problem with a steady solver (for...
View ArticlePrediction of the critical Reynolds number
Hi everyone, I'm using Comsol for simulating fluid flow in periodic media. Do you have an idea on how can I predict the laminar/turbulent transitional Reynolds ? Thank you in advance Mehrez
View Articlescaling of variables
What is scaling of variables and how does this influence the final solution? What should be chosen for scaling of variables from "manual, initial value based, automatic, none"? Thanks for the help....
View ArticleIntegration of a value over cross-section
Hello everyone, I have a model of molecular diffusion in a cylinder (axisymmetric geometry), and after solving (stationary solver) I get the concentration field c(r,z). I would like to get rid of the r...
View ArticleTurbulence in pipe flow
Hi, I am studying the Navier Stokes equation in the context of pipe flow. As of now, I am using Water, modeling it as incompressible, with outlet at 0 Pa and a parabolic inlet profile. (currently at...
View Articlei need help for wind turbine simulation
Hi everybody.. i have to do wind turbine's blade fluid simulation. ( like this www.youtube.com/watch?v=t5Ioi_...;list=LLzuYZUfzOzTpLaduSXQQqew)
View ArticleNavier-Stokes Simulation using Coefficient Form PDE
Hi: I need to simulate fluid flow in a triangular duct, but I need to run it on a high reynold number. The problem is that when I run the model using the default "Laminar Flow" physics tab, I need a...
View Articlecross-section averaged fluid temperature as a function of flow direction
Hi, I am modeling 3D laminar flow with heat transfer in a channel of rectangular cross-section. How can I implement the attached formula for mean fluid temperature? I would like to determine the mean...
View Articleaveraging of data
I am a new user of comsol 3.5a . I am getting data of heat transfer coefficient from a surface plot which is non-repeatable ,can you please tell me how to averaging of this data.
View ArticleFluid Structure Interaction problem
Dear all, I am trying to 2D model a solid body (circle) rotating in simple shear flow in a channel and I am using the fluid structure interaction module to try and solve it. I have followed the...
View ArticleRamp fuction or?
Hi, I am simulating heat transfer with fluid flow, thus I need to slowly increase my heat source to make my simulation works. Until now I've been using step function but I feel liek ramp function fits...
View ArticleHeat Transfer for heatsink
Hello I'm a student on the project, and I'm messing in COMSOL 4.0 a short time and have no notion of "heat transfer", I need to get the temperature to stabilize so you can compare with the real model!...
View ArticleConvergence problems simulating a thin film - structural mechanics coupling
Hey everybody! My goal is to simulate the stresses during a load cycle in a bearing shell. The problem: I assembled a journal bearing in con-rod from which i cut off the major part so that the...
View ArticleHow to plot stress relaxation data
Hi, I've implemented a confined compression test on a cylindrical disk using the poroelasticity model with a isotropic solid matrix. The test consist in one ramp of increasing displacement...
View ArticleMhd model of a crucible furnace
Dear collegues, i´m setting the procedure to evaluate the movement of the molten metal in a simple crucible furnace: reading the papers from comsol (...
View ArticleTurbulent fluid flow in pipes with constant temperature
Hello, I think it is an easy question but I am new in COMSOL and I am really lost about what to do now. I am trying to simulate a time dependent air distribution through several pipes in turbulent...
View ArticleUsing Conjugate Heat Transfer for optimization
Hi, everyone, I want to use the Conjugate heat transfer module to make an optimized design of fluid channels in a design domain. Inlet is water, and when the water flows inside the domain, the channel...
View ArticleSuccessive simulation in COMSOL 4.3
Hello everybody! I am curently doing simulations of fluid flows in microfluidic channels. The total simulation domain is quite big and a mesh that could provide a solution with resonable precision...
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