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Towards Direct Numerical Simulation of Hypersonic Transition Delay Via Distributed Wall Porosity

Sousa, Victor C. B. and Wartemann, Viola and Wagner, Alexander and Scalo, Carlo (2019) Towards Direct Numerical Simulation of Hypersonic Transition Delay Via Distributed Wall Porosity. In: AIAA Scitech Forum, 2019. AIAA Science and Technology Forum and Exposition (AIAA SciTech 2019), 07.-11. Jan. 2019, San Diego, California, USA. doi: 10.2514/6.2019-2151.

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The present manuscript outlines the progress made towards conducting a numerical analysis using three-dimensional direct numerical simulation (DNS) of transition to turbulence in a hypersonic boundary layer over a sharp cone, including the effects of acoustic energy absorption of a carbon/carbon (C/C) porous insert. Previous experimental studies proved the effectiveness of C/C in achieving hypersonic boundary layer transition delay and the current numerical study assesses its influence on high speed transition by modeling the C/C acoustic response as a complex impedance boundary condition (IBC). Simulations of a spatially developing boundary layer over a conical model, perturbed near the inflow by a pseudo-random forcing function, are performed with impermeable and porous walls. The current numerical scheme used is shown to be unstable after the appearance of the shocklets inside turbulent spots during transition and comparisons between results over impermeable and porous surfaces are made up to onset of transition. Nonetheless, the effectiveness of wall porosity in attenuating second-mode waves is demonstrated once again. The IBCs are also reactive to the three-dimensional overlying transitional turbulent flow, resulting in intense local regions of negative acoustic flux (i.e. acoustic energy leaving the domain), most likely associated with bursting events.

Item URL in elib:https://elib.dlr.de/125667/
Document Type:Conference or Workshop Item (Speech)
Title:Towards Direct Numerical Simulation of Hypersonic Transition Delay Via Distributed Wall Porosity
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:January 2019
Journal or Publication Title:AIAA Scitech Forum, 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:hypersonic boundary-layer, second mode, carbon/carbon (C/C), direct numerical simulation (DNS), linear stability theory (LST), transition control
Event Title:AIAA Science and Technology Forum and Exposition (AIAA SciTech 2019)
Event Location:San Diego, California, USA
Event Type:international Conference
Event Dates:07.-11. Jan. 2019
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Shefex III (old), R - Project ReFEx - Reusability Flight Experiment
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, BS
Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Wartemann, Viola
Deposited On:07 Jan 2019 16:25
Last Modified:18 Jul 2023 14:02

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