Help Needed - Lift and Drag for a Flat Plate, Normal to Flow
I am trying to determine the lift and drag coefficients for a 2-D flat plat ( 0.1 m chord x 0.0166667 m height ) oriented perpendicular to an air flow with Re of 10^4 using the Spallart-Almaras...
View Articlesame Problem
Hi Melvin, I have the same problem. i am trying to simulate air/ water interaction. The device has two inlet, and one output. each fluid should enter in one inlet. Please if you find an answer to your...
View ArticleDependent Variables Issues with Heat Transfer in Porous Media
In my model I'm simulating the mass diffusion present in a section of soil directly above an underground coil fire. To simulate the underground coal fire I'm using the Darcy flow, heat transfer through...
View ArticleNon-isothermal pipe flow in Comsol
Hi all, I am trying to figure out the theoretical background of this module since, instead of using a 3D pipe flow model, it cuts down to 1D pipe flow. 1. Does it mean this module essentially equal to...
View ArticleSystem state dependent boundary condition
In simulations of evaporation from porous media convergence issues in COMSOL may arise Consider a porous media is of arbritrary length (1D) and the water movement within is mathematically expressed by...
View ArticleFree convection in oil
Hello, I am trying to simulate free convection in transformer oil, but I find it kinda hard. Its easy to simulate free convecction in gases or water using Conjugate Heat Transfer (Fluid and Volume...
View ArticleConvergence problem ( PID heater controller)
Hi, I have a problem with the convergence of my model. I have this message d'error "" there are 876 degrees of freedom returning NaN / Inf in the matrix rows for the variable comp1.T. the coordinates...
View ArticleApplying a pressure to a boundary
Hello Ivar, Sorry for contacting you directly, but I have limited time and you seem to be one of the most knowledgeable people in the forums. It could just be a quick fix. I am having an issue with...
View Articleon heat transfer from semiconductors and the effect of the surface due to...
i am pretty new to comsol.....i need to simulate and measure the changes in temperature when a coolant liquid flows over a semiconductor surface in an integrated circuit. and also how the surface of...
View ArticleConvergence Problem when using the Periodic Flow Condition
Hi everyone, I'm currently using the Laminar Two Phase Flow- Phase Field(tpf) model in Comsol 4.4. The geometry setup is attached. The problem is when I applied Periodic Flow Condition to the left and...
View ArticleLift- and drag coefficient on rotating cylinder in a uniform stream
Hi all, I'm trying to plot the lift and drag force on a rotating cylinder in a uniform stream (2D) for low Re=100. I've been successfull with calculating/plot the coefficient for the non-rotating...
View ArticleBoundary conditions to create a closed loop in comsol
Hi all, I am trying to build a heat exchanger in comsol with fluid flowing like attached file. Velocity and pressure are given at inlet and outlet. What I need to do is to set the boundary conditions...
View ArticleApplying a pressure boundary condition
Hello All, I am having an issue with modeling blood flow through an artery. There is an example in the forum, but it is not helping me. I have two rectangular domains that share a side in 2D...
View Articleproblem with boiling, evaporation and heating
Hello people. I have problem with boiling and evaporation in comsol. I have vertical equipment. This equipment is divided in two parts. In first part is heating and part 2 is boiling+ evaporation. I...
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 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 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 Articleliquid mixing using ultrasound (acoustic module)
Hi and good day for you I'm new in Comsol, my question is, can I simulate the mixing of two immiscible liquid by means of ultrasound wave(20KHz and 500W)? how? for example we have a small vessel (1...
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 Articlefinding a specified flow rate in a '3D cut plane'
Hello, I'm trying to do some postprocessing in a 3D fluid channel flow over a fractured hole. The channel is filled with water and is laminar. Here's what I'm trying to do: 1. cut the surface at an...
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