Library Subscription: Guest
ICHMT DL Home Current Year Archives Executive Committee International Centre for Heat and Mass Transfer

DNS and LES predictions of intermittency in a turbulent round jet

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.330
page 12

T. Gilliland
School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK

K.K.J. Ranga-Dinesh
School of Engineering, Cranfield University, Bedford MK43 0AL, UK

Michael Fairweather
School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK

S. A. E. G. Falle
School of Mathematics, University of Leeds, Leeds LS2 9JT, UK

Karl W. Jenkins
School of Engineering, Cranfield University, Cranfield, Bedford, MK43 0AL, UK

A. M. Savill
School of Engineering, Cranfield University, Bedford MK43 0AL, UK

Abstract

Direct numerical and large eddy simulation have been applied to study the intermittency in a turbulent round jet with a Reynolds number of 2400. Comparisons between time-averaged results for the velocity and scalar fields demonstrate reasonable agreement with the data and predictions of other authors, and between the present LES and DNS, although notable differences do occur in the latter. Derived probability density functions are also in reasonable agreement, although the DNS results demonstrate the more rapid influence of intermittency with radial distance in the jet. This is reflected in derived intermittency profiles, with LES generally giving profiles that are broader than equivalent DNS results. Despite these differences, the transition from turbulent to non-turbulent flow is always predicted to be more rapid for the scalar than for velocity with, in general, this transition occurring closer to the centre-line for the scalar than for the velocity.

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