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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...

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same 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...

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Dependent 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...

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Non-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...

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System 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...

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Free 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...

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Convergence 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...

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Applying 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...

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on 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...

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Convergence 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...

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Lift- 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...

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Boundary 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...

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Applying 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...

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problem 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...

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Fluid 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...

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liquid 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...

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finding 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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Various Problems for Two Phase Flow coupling with Electrostatic

Hi! I am working on Two Phase Flow coupling with Electrostatic using transient (phase initialization and time dependent) solver to simulate electrospray phenomenon, I have encounter some problems and...

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i 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)

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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.

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