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Efficient Analysis of Transonic Base Flows Employing Hybrid RANS/LES Methods

Fertig, M. and Schumann, J.-E. and Hannemann, V. and Eggers, Th. and Hannemann, K. (2017) Efficient Analysis of Transonic Base Flows Employing Hybrid RANS/LES Methods. In: Fundamental Technologies for the Development of Future Space-Transport-System Components under High Thermal and Mechanical Loads Sonderforschungsbereich/Transregio 40 Annual Report, 9. Lehrstuhl für Aerodynamik und Strömungstechnik, Technische Universität München. pp. 115-126.

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Abstract

Scale resolving simulations employing hybrid URANS/LES methods allow for the prediction of transient phenomena of unsteady flows. In order to resolve the underlying phenomena a high spatial resolution especially of free shear layers is required. In addition, small time steps are necessary to obtain the formation of the vortices. Small time steps and high spatial resolution lead to large computing time as well as a great amount of permanent storage for the generated data. Different approaches have been followed to improve efficiency, reduce computational cost and decrease storage requirements. Grid adaptation has shown to be a suitable approach for the refinement of regions where grid resolution is too low. However, proper adaptation criteria are required. It was further found that the high resolution of the shear layer does not allow for a significant speed up of the simulation by employing a time stepping scheme which combines an implicit with an explicit solver. Although grid adaptation successfully reduces the number of grid points leading to a reduction of storage needs, the large amount of data still requires suitable data reduction technologies in order to exploit the results in an industrial context. This can be achieved employing decomposition methods like POD and DMD that describe the flow by a series expansion.

Item URL in elib:https://elib.dlr.de/116856/
Document Type:Contribution to a Collection
Title:Efficient Analysis of Transonic Base Flows Employing Hybrid RANS/LES Methods
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fertig, M.markus.fertig (at) dlr.deUNSPECIFIED
Schumann, J.-E.UNSPECIFIEDUNSPECIFIED
Hannemann, V.UNSPECIFIEDUNSPECIFIED
Eggers, Th.UNSPECIFIEDUNSPECIFIED
Hannemann, K.UNSPECIFIEDUNSPECIFIED
Date:2017
Journal or Publication Title:Fundamental Technologies for the Development of Future Space-Transport-System Components under High Thermal and Mechanical Loads
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:9
Page Range:pp. 115-126
Editors:
EditorsEmail
Stemmer, C.sfbtr40@aer.mw.tum.de
Adams, N. A.Nikolaus.Adams@tum.de
Haidn, O. J.haidn@lfa.mw.tum.de
Radespiel, R.r.radespiel@tu-braunschweig.de
Sattelmayer, T.sattelmayer@td.mw.tum.de
Schröder, W.wsch@aia.rwth-aachen.de
Weigand, B.bernhard.weigand@itlr.uni-stuttgart.de
Publisher:Lehrstuhl für Aerodynamik und Strömungstechnik, Technische Universität München
Series Name:Sonderforschungsbereich/Transregio 40 Annual Report
Status:Published
Keywords:Strömungssimulation, intationär, DES, Navier-Stokes, POD, DMD
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Numerische Verfahren und Simulation
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, BS
Deposited By: Fertig, Dr. Markus
Deposited On:13 Dec 2017 10:55
Last Modified:13 Dec 2017 13:26

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