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April 3, 2016, 02:51 |
Heat Flux as Boundary Condition
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#1 |
Member
Akr
Join Date: Apr 2015
Location: India
Posts: 53
Rep Power: 11 |
Hi My Dear Foamers !!!
I recently started working with OpenFOAM and Many of stuffs i am confused about OF. Everyday i am learning useful things in OF bcoz of CFD online and its discussions. Foremost thank you all for the great help! Recently, I am trying to workout an incompressible flow through a pipe. I have chosen, buoyantBoussinesqPimpleFoam as my base solver. I wanted to study a transient case and laminar, so i have taken out the turbulence part from the solver and modified it. However, I want to apply the boundary condition on the pipe wall as a uniform heat flux boundary condition. Foremost, as i dig up the user guide and cfd forums i found that we could use fixedGradient patch to specify heat flux condition on wall. TubeWall { type fixedGradient; gradient uniform ________; <--- we can input a value } As far as my understanding about the physics. I am modeling only the fluid domain, so the heat flux which i want to apply say it is 100 W/m2. So if my fluid is water, gradient = Q"/k where k is for the fluid. Is this correct way to specify the fixedGradient Boundary Condition??? If am wrong please do Correct me???? Thank you FOAM-Ers in advace !!!! Have a Great Day@@@ |
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November 26, 2016, 19:01 |
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#2 |
Senior Member
alberto
Join Date: Apr 2016
Location: Mexico
Posts: 119
Rep Power: 10 |
Hi
I am trying to do a pipe with air and heat flux in the wall, did you find how to do, something like that? how can i put heat flux on wall? |
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January 26, 2017, 15:58 |
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#3 |
New Member
Max
Join Date: Jan 2017
Posts: 9
Rep Power: 9 |
Unfortunately it's not so simple. FixedGradient BC for temperature will simply ensure a prescribed delta T between wall and fluid.
Here you are dealing with solid-fluid interface, where conductivity changes. So you have to implement Fourier law: q = k*dT, where k -- heat transfer coefficient [W/m2*K]. |
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