# Alphat file in heat transfer case

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 May 16, 2013, 16:53 Alphat file in heat transfer case #1 Member   yu Join Date: Nov 2010 Posts: 39 Rep Power: 9 Hello all, I am trying to run a turbulent heat transfer in a pipe with k-epsilon model using buoyantBuossieqSimpleFoam. I use the hotroom example to set up my case. I don't know what the Alphat file in the 0 folder from the tutorial. I don't see it got calculated from the fvSolution or fvSchemes files. Would someone help? thank you. best, yu

 June 8, 2017, 17:39 #2 New Member   Valerie Join Date: May 2017 Posts: 1 Rep Power: 0 Hi Yu, this is an old question, but I encountered the same one. I'll share the information I found as it might help others. As mentioned in this thread, you can find the code for alphat calculations in the appropriate file in \src\TurbulenceModels\compressible\turbulentFluidT hermoModels\derivedFvPatchFields\wallFunctions\alp hatWallFunctions. For in the alphatWallFunction, you'll see something like alphat = rho*nut/Prt, where rho is density, nut is the turbulent kinematic viscosity and Prt is the turbulent Prandtl number. Relations with conventional variables: Pr = nu/alpha = (viscous diffusion rate/thermal diffusion rate) = (mu/rho)/alpha and nu = mu/rho alpha is conventionally defined as the thermal diffusivity, and from these relations it follows that rho*nu/Pr = rho*alpha. In the model, alphat is then defined as the density*thermal diffusivity. A unit analysis of this train of thought matches the units in the parameter files where alphat [1 -1 -1 0 0 0 0] and mut [0 2 -1 0 0 0 0]. cfd lover likes this. Last edited by elegant_v; June 8, 2017 at 20:07. Reason: Solved

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