Scalable Wall Function in OpenFOAM?

seasoul · July 21, 2016, 03:29

I am simulating a turbine blade problem and the y plus value of the first layer (after running quite a while) becomes 9~323. I do not want to coarsen the near wall mesh with the consideration of resolving the near-blade region. So I plan to use kOmegaSST model and scalable wall function?

But I cannot figure out which wall function to be used as scalable wall function.The conventional kqRwallfunction or kLowReWallFunction for k?

tikulju · October 12, 2016, 08:19

Hello,

Actually there isn't this feature in OpenFOAM. I modified for k-epsilon simulations the epsilonWallFunction BC to account this, by expressing epsilon and G with the aid of limited yPlus. The modified wall function works really good, at least it's stable and gives good convergence. Maybe you could do the same with omega?

- Timo

July 21, 2016, 03:29	Scalable Wall Function in OpenFOAM?	#1
seasoul New Member wuyu Join Date: Mar 2010 Posts: 27 Rep Power: 16	I am simulating a turbine blade problem and the y plus value of the first layer (after running quite a while) becomes 9~323. I do not want to coarsen the near wall mesh with the consideration of resolving the near-blade region. So I plan to use kOmegaSST model and scalable wall function? But I cannot figure out which wall function to be used as scalable wall function.The conventional kqRwallfunction or kLowReWallFunction for k?

October 12, 2016, 08:19	Scalable wall function	#2
tikulju New Member Timo Kulju Join Date: Aug 2009 Posts: 22 Rep Power: 16	Hello, Actually there isn't this feature in OpenFOAM. I modified for k-epsilon simulations the epsilonWallFunction BC to account this, by expressing epsilon and G with the aid of limited yPlus. The modified wall function works really good, at least it's stable and gives good convergence. Maybe you could do the same with omega? - Timo

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