Suscripción a Biblioteca: Guest
Página principal de la Biblioteca Digital de ICHMT Año actual Archivos Comité Ejecutivo Centro Internacional de Transferencia de Calor y Masa

Hybrid RANS-LES modelling with an energy backscatter function incorporated in the LES mode

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.260
pages 228-236

Shia-Hui Peng
Department of Applied Mechanics, Chalmers University of Technology; and Department of Aeronautics and Systems Integration, Swedish Defence Research Agency (FOI), Sweden


In conjunction with the conventional SGS viscosity model, the additional Leonard term, stemmed from a Taylor expansion of the subgrid stress tensor, is incorporated in the LES mode of hybrid RANS-LES modelling. The energy backscatter function implied by this term is exploited to enhance the turbulence-resolving capability in hybrid RANS-LES computations when dealing with free shear layer emanating from a RANS-modelled upstream boundary layer. Using an existing algebraic hybrid model as the testing platform, the Leonard term is combined with the Smagorinsky model and forming a mixed-type SGS model that is further hybridized with a mixing-length RANS model in the near-wall region. The resulting model is examined in simulations of a turbulent channel flow, a periodic hill flow and a backward-facing step flow. It is shown that the model is able to enhance resolved turbulence level in free shear layer and producing mean flows and resolved turbulent statistics in reasonable agreement with available experimental, DNS or full LES data.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH