[Davide95]

Dear Foamers,
I am working on my master thesis where I try to validate some hybrid RANS LES models.
Right now I am simulating the flow past a cylinder at RE = 140k with SA-DDES (spalart allmaras detached eddy simulation).


I found that this work has already been done in the article "Detached-Eddy Simulations Past a Circular Cylinder" by "ANDREI TRAVIN, MICHAEL SHUR, MICHAEL STRELETS and PHILIPPE SPALART".



The authors found out that setting at the inlet nutilda = 0 the model provides a flow which is laminar (and comparable with experimental results at RE= 140k) while providing a non zero value of nutilda makes the simulation turbulent.


In my simulation I obtained the exact same cp and cf profiles they got for the turbulent case (inlet nutilda !=0) but when trying to "force" the simulation to stay laminar imposing nutilda=0 I get completely different profiles.


Does anybody know If this discrepancy is caused by OpenFoam implementation of SA? Or more generally does anyone have a clue about why this is happening?

Could it be caused by the fact I am using a DDES model rather than a DES ? (I don't think so)



Thanks in advance

Davide