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Engineering turbulence modelling, simulation and measurements; preface special issue

Authors:
Flow Turbulence Combust (2012) 88:1–2
DOI 10.1007/s10494-011-9383-7
Preface
Special Issue: Engineering Turbulence Modelling,
Simulation and Measurements
M. A. Leschziner ·K. Hanjali
´
c ·W. Rodi
Published online: 5 January 2012
© Springer Science+Business Media B.V. 2012
This Special Issue contains substantially extended and revised versions of 13 papers
selected from a total of 155 contributions that had been accepted for presentation
at the Symposium “Engineering Turbulence Modelling and Measurements-8
(ETMM-8)”, held in Marseille in June 2010 under the auspices of ERCOFTAC. The
ETMM series of events was established to give greater prominence and sharper focus
to research on application-oriented aspects of turbulence and its computational and
experimental characterisation, thus helping to bridge the gap between fundamental
approaches to turbulence and the exploitation of models, codes and knowledge in an
industrial setting. In this respect, ETMM is thematically closely consonant with the
aims and ethos of FTaC.
Within the broad spectrum of topics featuring at ETMM meetings, the majority
of papers deal with computational and experimental approaches to complex aero-
and hydro-dynamic flows, heat transfer, multi-phase and reacting flows, flow control,
flows in power generation and environmental fluid mechanics. The present Special
Issue aspires to reflect this mix and to provide an archival record of some of the best
papers presented at ETMM-8. To this end, selected papers were subjected to the
same rigorous review process as that followed in respect of any other contribution
to FTaC, each manuscript being reviewed by three leading experts, with some
manuscripts undergoing three revisions before being accepted.
M. A. Leschziner (
B
)
Aeronautics Department, Imperial College London,
Prince Consort Rd., London SW7 2AZ, UK
e-mail: mike.leschziner@imperial.ac.uk
K. Hanjali
´
c
Department of Multi-scale Physics,
Delft University of Technology, Leeghwaterstraat 39,
2628 CB Delft, The Netherlands
W. Rodi
Institute for Hydrodynamics, Karlsruhe Institute of Technology,
Kaiserstrasse 12, 76131 Karlsruhe, Germany
2 Flow Turbulence Combust (2012) 88:1–2
Of the 13 papers included in this Special Issue, one documents a LES study of
the aerodynamics of a complex jet discharged from a serrated nozzle; three papers
examine various aspects of transition and turbulence in turbomachine-related flows,
two applying LES and one experimental techniques; two papers report studies
on different aspect of heat transfer with LES or a statistical model; one paper
investigates the effectiveness of drag-reducing polymers in ducts; four papers focus
on combustors or a flame, examining with LES aerodynamic issues, scalar transport,
heat transfer and reaction, one paper also reporting new experimental data for
validation; one paper applies LES to a reacting flow in a diesel engine; and the final
paper provides a review of research on atmospheric turbulence in the context of wind
energy.
The Editors hope that the readers of this Special Issue will judge it to be a valuable
contribution to the literature, and to give credit to efforts by the scientific community
to engage in turbulence modelling, simulation and measurements of immediate
relevance to the industrial arena.
M.A. Leschziner, Guest Editor
K. Hanjali
´
c
W. Rodi
Conference Paper
This paper reports a large eddy simulation (LES) of the precession-like oscillation produced by partially confining a triangular-jet flow with a short cylindrical chamber. The present LES, which has been verified by previous experimental data, shows that there is a strong inward swirl around the jet near the inlet end of the chamber. At the center of the swirl, there is a cluster of three sink foci, where each focus is aligned midway between the corners of the triangular inlet orifice. In the time-averaged flow field, the vortices rising from the foci are helically twisted about the core of the jet. As the flow passes through the chamber, the foci merge to form a closed-loop ''bifurcation line'' which separates the inward swirl and the core flow. The core of the emerging jet is visible as a source node at the approximate centerline of the chamber. If the chamber is removed, a cluster of six counter-rotating foci is produced in the ''free'' jet. When this happens, the net swirl circulation is zero and there is no jet oscillation.
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