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Direct Numerical Simulation of the Transition Process in a Separated Supersonic Ramp Flow

Lüdeke, Heinrich und Neil D., Sandham (2010) Direct Numerical Simulation of the Transition Process in a Separated Supersonic Ramp Flow. 40th AIAA Fluid Dynamics Conferenece and Exhibit 2010, 28 June - 1 July 2010, Chicago, IL, USA.

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Kurzfassung

Despite intensive theoretical and experimental research, transition to turbulence in separated hypersonic ramp flows is still a challenge to predict. One of the most successful approaches to model the dominant mechanisms is direct numerical simulation, which has demonstrated the capability to generate reliable datasets. In the present study, different supersonic test cases are chosen from literature and compared with simulations using a high-order version of the DLR FLOWer code. The results using higher-order Pade-filter approaches are encouraging. With this validation as a background, a supersonic ramp case was chosen for study. Different ramp-angles and Reynolds numbers were investigated to determine a transitional test case, for which turbulence can be resolved behind re-attachment. A hypersonic ramp with 12° angle of attack was then chosen for three-dimensional DNS of the transition process. These DNS were carried out with different grid extents in the wall-normal direction and different sweep angles of the incoming flow with good success. Simulations of laminar-turbulent breakdown are presented using various perturbation spectra at the inflow.

Dokumentart:Konferenzbeitrag (Paper)
Titel:Direct Numerical Simulation of the Transition Process in a Separated Supersonic Ramp Flow
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Lüdeke, Heinrichheinrich.luedeke@dlr.de
Neil D., Sandhamn.sandham@soton.ac.uk
Datum:26 Juni 2010
Status:veröffentlicht
Stichwörter:Direct Numerical Simulation, Ramp Flow, Hypersonic, Re-entry, Transition
Veranstaltungstitel:40th AIAA Fluid Dynamics Conferenece and Exhibit 2010
Veranstaltungsort:Chicago, IL, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:28 June - 1 July 2010
Veranstalter :AIAA
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W RP - Raumtransport
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):W - Grundlagen Raumtransport - numerische Verfahren (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Raumfahrzeuge
Hinterlegt von: Dr.-Ing. Heinrich Lüdeke
Hinterlegt am:18 Jan 2011 09:50
Letzte Änderung:18 Jan 2011 09:50

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