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- Shia-Hui, Peng, 1967, et al.
(författare)
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Examination of the shear stress transport assumption with a low-Reynolds number κ - ω model
- 2007
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Ingår i: 37th AIAA Fluid Dynamics Conference; Miami, FL; United States; 25 June 2007 through 28 June 2007. - 1563478978 ; 1, s. 178-191
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Konferensbidrag (refereegranskat)abstract
- Using a low-Reynolds number k - ω model and its high-Reynolds number variant as base models, the Shear Stress Transport (SST) concept is examined in computations of flows around the RAE2822 airfoil and the DLR-F6 wind-body configuration. Both flows are characterized by local boundary layer separation. Based on an analysis of the net production for the turbulent kinetic energy, k, and for its specific dissipation rate, u, the rationale is highlighted behind the SST formulation that enables improved predictions of flow separation. It is shown that the SST formulation may make the modeling contain the growth of the production of k and, consequently, suppress the turbulent diffusion. Incorporating the SST assumption, the model responds more appropriately to the effect of an adverse pressure gradient in the boundary layer and produces more extended flow separation bubble than the original base model. Improvement due to the SST formulation is also observed in predictions of the shock location for the transonic aerodynamic flows considered in this work.
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- Shia-Hui, Peng, 1967
(författare)
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Hybrid RANS-LES modelling based on zero- and one-equation models for turbulent flow simulation
- 2005
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Ingår i: The Fourth International Symp. on Turbulence and Shear Flow Phenomena / Humphrey, J.A.C., Eaton, J.K., Friedrich, R., Kasagi, N., Leschziner, M.A., Gatski, T.B.. ; 3, s. 1159-1164
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Konferensbidrag (refereegranskat)
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| 5. |
- Shia-Hui, Peng, 1967, et al.
(författare)
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Numerical Analysis of Rayleigh-Bénard Convection Flow Using Large Eddy Simulation at high Rayley Numbers
- 2005
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Ingår i: The Fourth International Symp. on Turbulence and Shear Flow Phenomena / Humphrey, J.A.C., Eaton, J.K., Friedrich, R., Kasagi, N., Leschziner, M.A., Gatski, T.B..
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Konferensbidrag (refereegranskat)
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| 6. |
- Shia-Hui, Peng, 1967, et al.
(författare)
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Unsteady simulations for the flow over a three-element high-lift configuration at stall
- 2008
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Ingår i: 38th AIAA Fluid Dynamics Conference and Exhibit; Seattle, WA; United States; 23 June 2008 through 26 June 2008. - Reston, Virigina : American Institute of Aeronautics and Astronautics. - 9781563479427
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Konferensbidrag (refereegranskat)abstract
- Unsteady computations are conducted for turbulent flow around the A310 three-element configuration at the incidence of ? s = 25.2°, where the stall has been claimed by wind tunnel test for a freestream Mach number of M ? = 0.22 and a chord-based Reynolds number of Re = 4.1 × 10 6. The time-dependent flow properties are explored using unsteady RANS (URANS) modelling with the Spalart-Allmaras model and an EARSM ? - ? model. The effect of the time step and the grid resolution is highlighted on the URANS-modelled periodical flow features. The computed results are compared with available experimental data. It is shown that the URANS modelling may pronounce a stalled flow at an incidence larger than the measured ? s, at which the existence of transition is uncertain around the leading edges of the slat and the main element. Some DES results have thus been invoked, indicating significant effects due to the specification of transition.
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