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UNSTEADY INVESTIGATION OF THE DLR TIC NOZZLE BY DIFFERENT TURBULENCE MODELS

Lüdeke, Heinrich (2007) UNSTEADY INVESTIGATION OF THE DLR TIC NOZZLE BY DIFFERENT TURBULENCE MODELS. 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

Afterbodys of launchers and re-entry vehicles are characterized by large base regions submitted to intense back flow, aerodynamic instabilities and pressure fluctuations on the afterbody and on the nozzle region. Consequently in addition to experimental investigations a necessary capability of numerical tools is the capability to simulate unsteady super- and hypersonic flow fields of such configuration and to resolve turbulent wake flows, interacting with nozzle sections, on realistic launcher configurations. One of the experimental activities in this scope was performed by DLR at the P6.2 facility in Lampoldshausen, Germany, providing an experimental data base for the DLR TIC nozzle under overexpanded cold gas conditions. Key objectives of this test case are the correct prediction of the separation location and the assessment of the resulting unsteady side load torque. The geometry was specified by DLR, including nozzle inner and outer wall and the inflow geometry upstream the nozzle throat. The present computations were performed as a feasibility study, end preliminary results are presented here.Different computations on unstructured grids were carried out with grid adaptation at the shock structures. The test case was investigated by different descriptions of the turbulent flow field such as one equation URANS models and a DES (Detached Eddy Simulation) type simulation as well as laminar conditions. It has to be pointed out that the investigated grids are too coarse for a realistic DES and the resulting turbulence is only insufficiently resolved. Nevertheless the behaviour of the model under these conditions had to be investigated to earn experience for further simulations.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:UNSTEADY INVESTIGATION OF THE DLR TIC NOZZLE BY DIFFERENT TURBULENCE MODELS
Authors:
AuthorsInstitution or Email of Authors
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:Unsteady, TIC-Nozzle, 3D-flow, URANS, DES
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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