TRANSONIC AFTERBODY SIMULATION
Filimon, Alexander and Lüdeke, Heinrich
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.
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||Institution or Email of Authors|
|Filimon, Alexander||University Stuttgart|
|Journal or Publication Title:||Proceedings of the ATAC-FSCD WORKSHOP « AFTER-BODY AND NOZZLE FLOWS » November 15-16 at ESA/Estec, Noordwijk, The Netherlands|
|In ISI Web of Science:||No|
|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|
|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)|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Spacecraft|
Dr.-Ing. Heinrich Lüdeke
|Deposited On:||03 Sep 2007|
|Last Modified:||12 Dec 2013 20:27|
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