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An improved k−ω turbulence model applied to recirculating flows
- Source :
- International Journal of Heat and Fluid Flow. 23:731-743
- Publication Year :
- 2002
- Publisher :
- Elsevier BV, 2002.
-
Abstract
- 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.
- Subjects :
- Fluid Flow and Transfer Processes
Physics
Integrable system
Turbulence
K-epsilon turbulence model
Mechanical Engineering
Direct numerical simulation
Mechanics
K-omega turbulence model
Condensed Matter Physics
Open-channel flow
Physics::Fluid Dynamics
Classical mechanics
Heat transfer
Freestream
Subjects
Details
- ISSN :
- 0142727X
- Volume :
- 23
- Database :
- OpenAIRE
- Journal :
- International Journal of Heat and Fluid Flow
- Accession number :
- edsair.doi...........1c2a1053909705adf1a32cf8b0ce40bb