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

Lüdeke, Heinrich and Sandham, Neil (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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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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Direct Numerical Simulation of the Transition Process in a Separated Supersonic Ramp Flow
AuthorsInstitution or Email of Authors
Lüdeke, HeinrichDLR
Sandham, Neiln.sandham@soton.ac.uk
Date:July 2010
Keywords:DNS, Supersonic Ramp, Transition, turbulence
Event Title:40th AIAA Fluid Dynamics Conferenece and Exhibit 2010
Event Location:Chicago, IL, USA
Event Type:international Conference
Event Dates:28 June - 1 July 2010
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 of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Dr.-Ing. Heinrich Lüdeke
Deposited On:17 Nov 2011 08:58
Last Modified:12 Dec 2013 21:24

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