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Problem calculate Y in compressible turbulence model |
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May 31, 2006, 12:00 |
Hi all,
May be It's a studp
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#1 |
Member
Luca M.
Join Date: Mar 2009
Location: Luzern, Switzerland
Posts: 59
Rep Power: 17 |
Hi all,
May be It's a studpid question but I've noticed in file "turbulence.C" in compressible turbulence models that OF calucalte Y+ like: Yp = pow(Cmu.value(), 0.25) *y_[patchNo] *sqrt(k()().boundaryField()[patchNo].patchInternalField()) /( mu().boundaryField()[patchNo].patchInternalField() *rho_.boundaryField()[patchNo]<--- ); I think that it's wrong because I need the Kinematic viscosity that is defined as mu/rho. (I think that mu is refereed to Dynamic viscosity) and so the right way to calculate Y+ is Yp = pow(Cmu.value(), 0.25) *y_[patchNo] *sqrt(k()().boundaryField()[patchNo].patchInternalField()) /( mu().boundaryField()[patchNo].patchInternalField() /rho_.boundaryField()[patchNo]<--- ); I'm wrong ?! Luca |
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May 31, 2006, 12:41 |
Hi,
In the calculation of Y
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#2 |
Member
Pierre Le Fur
Join Date: Mar 2009
Location: UK
Posts: 60
Rep Power: 17 |
Hi,
In the calculation of Yplus in wallViscosity.H and WallFunctions.H for compressible flow codes, it is written: " scalar yPlus = Cmu25*turbulenceModel::y_[patchi][facei]*sqrt(k_[faceCelli]) /(muw[facei]/rhow[facei]); " which is as you suggest, so I guess you might be right. Thought that member function defined in turbulence.C is not used anywhere it seems. Pierre |
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May 31, 2006, 12:58 |
Hi Pierre,
So It's a bug..
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#3 |
Member
Luca M.
Join Date: Mar 2009
Location: Luzern, Switzerland
Posts: 59
Rep Power: 17 |
Hi Pierre,
So It's a bug.. I use the function Yp in turbulence.C to check y+ for compressible turbulence model that I use. In detail I build the utility starting from "checkYPlus" incompressible utility where, I think, it uses Yp function. So how do you suggest me to build my utility to check y+ without Yp function in turbulence compressible model?! Thanks in advance Luca |
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May 31, 2006, 13:19 |
why don't you calculate Yplus
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#4 |
Member
Pierre Le Fur
Join Date: Mar 2009
Location: UK
Posts: 60
Rep Power: 17 |
why don't you calculate Yplus directly as you wrote it above without using Yp function?
Pierre |
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June 1, 2006, 06:16 |
Thanks Luca, it was a bug and
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#5 |
Senior Member
Mattijs Janssens
Join Date: Mar 2009
Posts: 1,419
Rep Power: 26 |
Thanks Luca, it was a bug and has been fixed. Any more of these? If so please report them on the bugs list so we can keep track.
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June 1, 2006, 06:53 |
Ok,Mattijs!!
Thanks for the
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#6 |
Member
Luca M.
Join Date: Mar 2009
Location: Luzern, Switzerland
Posts: 59
Rep Power: 17 |
Ok,Mattijs!!
Thanks for the suggestion, and support. Luca |
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