CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

The PANS k-epsilon model in a zonal hybrid RANS-LES formulation

Lars Davidson (Institutionen för tillämpad mekanik, Strömningslära)
International Journal of Heat and Fluid Flow (0142-727X). Vol. 46 (2014), p. 112-126.
[Artikel, refereegranskad vetenskaplig]

A new approach to use the partially averaged Navier-Stokes (PANS) model as a hybrid RANS-LES model is presented. It is evaluated in fully developed channel flow and embedded LES in a hump flow. For the channel flow, the two RANS-LES interfaces are parallel to the walls. In the URANS region, f(k) is set to one. In the LES region, f(k) is set to a constant value (the baseline value is f(k) = 0.4) or it is computed. It is found that the new model gives good results for channel flow for a large span of Reynolds numbers (4000 <= Re-tau <= 32,000). In the channel flow simulations, three different grids are used in the wall-parallel planes, 32(2), 64(2) and 128(2), and the model yields virtually grid-independent flow fields and turbulent viscosities. Embedded LES is used for the hump flow which is well predicted. The RANS-LES interface is normal to the flow from the inlet. RANS is used upstream of the interface. Downstream this interface, RANS is used near the wall and LES is used away from the wall. (C) 2014 Elsevier Inc. All rights reserved.

Nyckelord: LES, PANS, 2G-RANS Zonal model, Embedded LES, Hybrid RANS LES, AVERAGED NAVIER-STOKES, LARGE-EDDY SIMULATION, TURBULENCE, FLOW, INTERFACE, NUMBER



Denna post skapades 2014-06-17.
CPL Pubid: 199312

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Strömningslära

Ämnesområden

Termisk energiteknik

Chalmers infrastruktur