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Numerical Investigation of Roughness Effects on Transition on Spherical Capsules

Hein, Stefan and Theiß, Alexander and Di Giovanni, Antonio and Stemmer, Christian and Schilden, Thomas and Schröder, Wolfgang and Paredes, Pedro and Choudhari, Meelan M. and Li, Fei and Reshotko, Eli (2019) Numerical Investigation of Roughness Effects on Transition on Spherical Capsules. Journal of Spacecraft and Rockets, 56 (2). American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.A34247 ISSN 0022-4650

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Official URL: https://arc.aiaa.org/doi/10.2514/1.A34247

Abstract

To address the hitherto unknown mechanism of boundary-layer transition on blunt reentry capsules, the role of roughness-induced disturbance growth on a spherical-section forebody is assessed via optimal transient growth theory and direct numerical simulations (DNS). Optimal transient-growth studies have been performed for the blunt capsule experiments at Mach 5.9 in the Hypersonic Ludwieg tube Braunschweig (HLB) of the Technische Universität Braunschweig, which included measurements behind a patch of controlled, distributed micron-sized surface roughness. Transient-growth results for the HLB capsule indicate similar trends as the corresponding numerical data for a Mach 6 experiment in the Actively Controlled Expansion (ACE) facility of the Texas A&M University (TAMU) at a lower Reynolds number. Both configurations indicate a similar dependence on surface temperature ratio, and more important, rather low values of maximum energy gain. DNS are performed for the conditions of the HLB experiment to understand the generation of stationary disturbances by the roughness patch and the accompanying evolution of unsteady perturbations. However, no evidence of either modal or nonmodal disturbance growth in the wake of the roughness patch is found in the DNS data; thus, the physical mechanism underlying the observed onset of transition still remains unknown.

Item URL in elib:https://elib.dlr.de/119306/
Document Type:Article
Additional Information:ISSN: 0022-4650 (print) EISSN: 1533-6794 (online)
Title:Numerical Investigation of Roughness Effects on Transition on Spherical Capsules
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hein, StefanUNSPECIFIEDUNSPECIFIED
Theiß, AlexanderUNSPECIFIEDUNSPECIFIED
Di Giovanni, AntonioTU MünchenUNSPECIFIED
Stemmer, ChristianTU MünchenUNSPECIFIED
Schilden, ThomasRWTH AachenUNSPECIFIED
Schröder, WolfgangRWTH AachenUNSPECIFIED
Paredes, PedroNASA Langley Research CenterUNSPECIFIED
Choudhari, Meelan M.NASA Langley Research CenterUNSPECIFIED
Li, FeiNASA Langley Research CenterUNSPECIFIED
Reshotko, EliCase Western Reserve UniversityUNSPECIFIED
Date:29 January 2019
Journal or Publication Title:Journal of Spacecraft and Rockets
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:56
DOI :10.2514/1.A34247
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0022-4650
Status:Published
Keywords:laminar-turbulent transition, blunt re-entry capsule, surface roughness, transient growth, direct numerical simulation (DNS)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Hein, Dr.-Ing. Stefan
Deposited On:19 Feb 2019 15:13
Last Modified:15 Nov 2019 14:28

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