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-   -   Forced convection with OF (http://www.cfd-online.com/Forums/openfoam/112596-forced-convection.html)

 Andrea1984 January 31, 2013 10:35

Forced convection with OF

Hi,

I would like to simulate a forced convection heat transfer problem using OF. The flow is incompressible and turbulent.

Any hints for the choose of the right solver, BCs and other settings are welcome.

Thanks,

Andrea

 romant January 31, 2013 14:28

Quote:
 Originally Posted by Andrea1984 (Post 405329) Hi, I would like to simulate a forced convection heat transfer problem using OF. The flow is incompressible and turbulent. Any hints for the choose of the right solver, BCs and other settings are welcome. Thanks, Andrea
For heat transfer problems with incompressible flow, take a look at bouyantBoussinesqSimpleFoam and buoyantBoussinesqPimpleFoam, for steady state and transient calculations respectively. There are a couple of tutorials included in OpenFOAM

 Andrea1984 February 1, 2013 06:55

Hi Roman,

These solvers are suitable only for buoyant flows, or are still valid in case of forced convection?

 romant February 1, 2013 07:33

yes, they are also valid for forced convection. The "buoyant" part of the name just states that they use the boussinesq approximation for buoyancy, where small changes in density are modeled through a temperature difference. but other than that the density is constant.

 Andrea1984 February 1, 2013 09:18

Ok, their names are a little bit misleading.
I'll have a look to the source code and run some test cases.

Thank you for the infos.

Andrea

 romant February 1, 2013 09:21

Hej,

it doesn't really matter that the buoyant part this is in the solver, since in forced convection your change in density and the buoyancy forces associated with it will be minimal (the flow will not be affected by it). Therefore, the solvers can be used for forced convection and for natural convection.

 cm_jubayer April 4, 2013 14:49

Hi Andrea,

I am also simulating forced convection over a solar panel in the atmospheric boundary layer. I am using buoyantBoussinesqPimpleFoam. Based on nOuterCorrectors you can switch between Pimple and Piso. Also, I am using 0 gravity which makes p and p_rgh same. However, I am facing bounding problem with omega specially (using SST k omega), trying different limited schemes, no luck yet.

But, to test the solver, I ran a simulation with forced convection over a flat plate with high Re and found a good match with the turbulent boundary layer correlation in theory. Also, I think to solve forced convection correctly, boundary layer has to be resolved completely (y+<1) without using wall functions.

Jubayer

 Andrea1984 April 4, 2013 15:03

Hi Jubayer,
Unfortunately I had to stop my testing with OF in forced convection because right now I'm pretty busy with other undertakings; however I would be glad if you can attach your convection over a flat plate case.

Andrea

 cm_jubayer April 4, 2013 15:20