averaging 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 ArticleHelp 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 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 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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