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

LES and URANS strategies for the computation of turbulent natural convection flow inside an annular horizontal penetration enclosure

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1700
pages 1660-1672

D. Ammour
School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL,UK

Timothy J. Craft
Turbulence Mechanics Group, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, PO Box 88, Manchester M13 9PL, UK

Hector Iacovides
Turbulence Mechanics Group, School of Mechanical, Aerospace and Civil Engineering. The University of Manchester, Manchester M13 9PL, U.K.


Turbulent natural convection flow inside a horizontal penetration enclosure has been performed using a highly resolved large eddy simulation (LES) and a set of RANS models including the k−ε model [7] with standard wall-function, and the SST k−ω scheme [10]. The penetration cavity consists of a horizontal annulus (of length-to-diameter ratio 16.56), the inner wall of which is cooled, whilst the outer is insulated. The cavity is closed at one end and connected to a large reservoir of hot fluid at the other. The fluid is CO2, with a Prandtl number of 0.7, giving a Rayleigh number of 1.5 × 109. The LES results show that the instantaneous field includes many structures inside the penetration. These structures are dispersed along the length of the penetration and outside towards the outlet of the surrounding domain. Results obtained from the LES and URANS simulations suggest that there is a general downward fluid motion inside the penetration. The SST k−ω scheme agrees better than the k−ε model with the present LES in the fact that the flow is unsteady and there are large-scale oscillations present which decrease in amplitude as one moves from the open towards the closed end of the annular enclosure. Results obtained from the standard k−ε model show that the flow reaches a steady state. Overall heat transfer and thermal quantitative results show that RANS models are in close agreement with the current 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