elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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. AIAA Science and Technology Forum and Exposition (AIAA SciTech 2019), 07.-11. Jan. 2019, San Diego, California, USA.

Full text not available from this repository.

Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sousa, Victor C. B.vsousa (at) purdue.eduUNSPECIFIED
Wartemann, Violaviola.wartemann (at) dlr.deUNSPECIFIED
Wagner, AlexanderAlexander.Wagner (at) dlr.deUNSPECIFIED
Scalo, Carloscalo (at) purdue.eduUNSPECIFIED
Date:January 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
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 Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Shefex III, Re-usability Flight Experiment (ReFEx)
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:07 Jan 2019 16:25

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.