Details

Autor(en) / Beteiligte

• Bredberg, Jonas
• Peng, Shia-Hui
• Davidson, Lars

Titel

An improved k− ω turbulence model applied to recirculating flows

Ist Teil von

• The International journal of heat and fluid flow, 2002-12, Vol.23 (6), p.731-743

Ort / Verlag

Elsevier Inc

Erscheinungsjahr

2002

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• In this paper an improved k− ω turbulence model is proposed, which brings the asymptotic boundary value for ω into accord with direct numerical simulation (DNS) data. In the new ω-equation both a turbulent and a viscous cross-diffusion term are included, justified by an analogy to the Yap-correction and the pressure-diffusion process, respectively. The importance of cross-diffusion terms in removing the freestream sensitivity with respect to ω for free shear flows is shown. The performance of the model is evaluated and compared with DNS and with other turbulence models in a channel flow, a backward-facing step flow and a rib-roughened channel flow with heat transfer. The model requires neither wall-function nor wall-distance information and is fully integrable over the near-wall region.