Internal Seminar Series 2011, 2011-02-22
B8 George Begg Building, 15:00
School of MACE, The University of Manchester



Hybrid RANS/LES: Blending models and blending filters

Massimo Germano

  massimo.germano@polito.it  

Files: Abstract: pdf Presentation: ppt

Abstract



As recently remarked by Sagaut and Deck [1] hybrid RANS/LES techniques are the main strategy to reduce computational cost compared to LES when attached boundary layers have a significant impact on the global flow. Different techniques are applied. One of the most studied and largely applied consists in a weighted sum of LES and RANS models, and can be classified as a zonal approach with a smooth transition from one model to another (see [2]). Recently a different blending technique has been proposed by [3], where the hybrid RANS/LES model is the model associated to the weighted sum of LES and RANS filters. One important point is that the resulting model contains a new term that some preliminary investigations have shown important to the hybrid simulation [4,5]. In the seminar we will illustrate this point, and we will discuss the possible implementation of such new hybrid technique.

References

  1. Sagaut, P. and S. Deck (2009). Large eddy simulation for aerodynamics: status and perspectives. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 367(1899), 2849–2860.
  2. Rolfo, S., J. C. Uribe, and D. Laurence (2010). LES and hybrid RANS/LES of turbulent flow in fuel rod bundle arranged with a triangular array. In V. Armenio, B. Geurts, and J. Frohlich (Eds.), Direct and Large-Eddy Simulation VII, Volume 13 of ERCOFTAC Series, pp. 409–414. Springer Netherlands.
  3. Germano, M. (2004). Properties of the hybrid RANS/LES filter. Theoretical and Computational Fluid Dynamics 17(4), 225–231.
  4. Sanchez-Rocha, M. and S. Menon (2009, 4). The compressible hybrid RANS/LES formulation using an additive operator. Journal of Computational Physics 228 (6), 2037–2062.
  5. Rajamani, B. and J. Kim (2010). A hybrid-filter approach to turbulence simulation. Flow, Turbulence and Combustion 85, 421–441.


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