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Numerical Analysis of Re-entry Configuration Aerodynamics in the Near Continuum Rarefied Flow Regimes

Hannemann, Klaus and Hepp, Christian and Grabe, Martin and Hannemann, Volker (2019) Numerical Analysis of Re-entry Configuration Aerodynamics in the Near Continuum Rarefied Flow Regimes. In: Proceedings of the 32nd International Symposium on Shock Waves (ISSW32 2019), pp. 1591-1601. Research Publishing Singapore. 32nd International Symposium on Shock Waves, 14.-19. Juli 2019, Singapore. DOI: 10.3850/978-981-11-2730-4_0306-cd ISBN 978-981-11-2730-4

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Official URL: http://rpsonline.com.sg/rps2prod/ISSW32/e-proceedings/html/0306.xml


Mature numerical flow solvers based on continuum (Navier-Stokes) and gas-kinetic (Direct Simulation Monte Carlo, DSMC) models are used to study the aerodynamics of a slender re-entry configuration at constant angle of attack with the aim to characterize the practical usability of these approaches in slightly rarefied hypersonic flow. Comparing to recent measurements in the 2nd test section of the continuously operating Hypersonic Vacuum Wind Tunnels Göttingen (V2G) of the German Aerospace Center (DLR), we find that DSMC reproduces the aerodynamic efficiency (ratio of lift to drag) well in the investigated range of free-stream Knudsen numbers 7.2 10−4 < Kn < 7.2 10−3, while the corresponding solutions obtained with the Navier-Stokes solver are systematically too low. Further analysis shows that the continuum method predicts a leeward density that is too high, ultimately leading to an apparent reduction in both lift and drag. Slip boundary conditions are not able to account for this numerical effect. While DSMC must be expected to yield correct aerodynamic coefficients for all degrees of rarefaction, the requirement to resolve kinetic length and time scales makes its computational cost grow quickly as the Knudsen number decreases. We demonstrate that a novel hybrid all-particle approach, combining a kinetic Fokker-Planck algorithm with DSMC, can reduce the required computational effort for low Knudsen numbers while maintaining DSMC-like accuracy, which makes it a promising numerical tool for aerodynamic design.

Item URL in elib:https://elib.dlr.de/130040/
Document Type:Conference or Workshop Item (Speech)
Additional Information:proceedings unter : http://rpsonline.com.sg/rps2prod/ISSW32/e-proceedings/index.html (ISBN: 978-981-11-2730-4)
Title:Numerical Analysis of Re-entry Configuration Aerodynamics in the Near Continuum Rarefied Flow Regimes
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hannemann, KlausKlaus.Hannemann (at) dlr.deUNSPECIFIED
Hepp, ChristianChristian.Hepp (at) dlr.deUNSPECIFIED
Grabe, MartinMartin.Grabe (at) dlr.deUNSPECIFIED
Hannemann, VolkerVolker.Hannemann (at) dlr.deUNSPECIFIED
Date:14 July 2019
Journal or Publication Title:Proceedings of the 32nd International Symposium on Shock Waves (ISSW32 2019)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.3850/978-981-11-2730-4_0306-cd
Page Range:pp. 1591-1601
Publisher:Research Publishing Singapore
Series Name:Proceedings of the 32nd International Symposium on Shock Waves (ISSW32 2019)
Keywords:Numerical Simulation, DSMC, Rarefied Flows, Re-entry Configuration
Event Title:32nd International Symposium on Shock Waves
Event Location:Singapore
Event Type:international Conference
Event Dates:14.-19. Juli 2019
Organizer:National University of Singapore
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 - Wiederverwendbare Raumfahrtsysteme und Antriebstechnologie
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Hannemann, Prof. Dr. Klaus
Deposited On:11 Nov 2019 13:43
Last Modified:11 Nov 2019 14:02

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