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TRANSONIC AFTERBODY SIMULATION

Filimon, Alexander and Lüdeke, Heinrich (2007) TRANSONIC AFTERBODY SIMULATION. In: Proceedings of the ATAC-FSCD WORKSHOP « AFTER-BODY AND NOZZLE FLOWS » November 15-16 at ESA/Estec, Noordwijk, The Netherlands. ATAC-FSCD WORKSHOP: « AFTER-BODY AND NOZZLE FLOWS », 2006-11-15 - 2006-11-16, ESA/Estec, Noordwijk, The Netherlands. (In Press)

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Abstract

One challenge of numerical investigations of unsteady super- and hypersonic flow fields is the study of turbulent wake flow and the interaction with nozzle sections at modern launcher configurations. Unsteady side-loads, induced by the interaction of flow separation inside of the nozzle and the launcher wake will strongly influence the design of future main stage propulsion systems. This interaction phenomenon, called buffeting coupling, is one of the main challenges during ascent. The purpose of the presented study is to simulate a combined generic base-flow nozzle configuration under fully turbulent conditions. It is intended as a generic model of the central stage of a launcher, including central body and nozzle area. Experimental data under transonic conditions is available from wind tunnel tests in the scope of the ATAC program. Simulations are carried out with recent turbulence models like detached-eddy simulation (DES). DES is a hybrid technique proposed by Spalart et.al. for the simulation of this kind of turbulent unsteady flows. The idea is to combine the best features of Reynolds-averaged Navier-Stokes (RANS) and the large eddy simulation (LES) for the computation of realistic configurations at high Reynolds numbers. The study was carried out by means of unstructured grids in the whole area including jet- and nozzle flow. Special care was taken on the influence of the time step size on the unsteady results and on grid influences. Comparisons with experimental pressure data, RMS distributions and power spectra have shown good agreement with the predicted DES results.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:TRANSONIC AFTERBODY SIMULATION
Authors:
AuthorsInstitution or Email of Authors
Filimon, AlexanderUniversity Stuttgart
Lüdeke, HeinrichUNSPECIFIED
Date:June 2007
Journal or Publication Title:Proceedings of the ATAC-FSCD WORKSHOP « AFTER-BODY AND NOZZLE FLOWS » November 15-16 at ESA/Estec, Noordwijk, The Netherlands
Refereed publication:No
In ISI Web of Science:No
Editors:
EditorsEmail
ESA, UNSPECIFIED
Status:In Press
Keywords:DES, afterbody, base-flow, nozzle, shear-layer flow
Event Title:ATAC-FSCD WORKSHOP: « AFTER-BODY AND NOZZLE FLOWS »
Event Location:ESA/Estec, Noordwijk, The Netherlands
Event Type:international Conference
Event Dates:2006-11-15 - 2006-11-16
Organizer:ESA-ESTEC
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Dr.-Ing. Heinrich Lüdeke
Deposited On:03 Sep 2007
Last Modified:12 Dec 2013 20:27

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