The University of Southampton
University of Southampton Institutional Repository

Numerical simulation of Görtler vortices in hypersonic compression ramps

Numerical simulation of Görtler vortices in hypersonic compression ramps
Numerical simulation of Görtler vortices in hypersonic compression ramps
A numerical study of the formation and evolution of Görtler type vortices over a compression ramp under an hypersonic flow is presented. Numerical predictions in laminar compression ramps (body/body-flaps configurations) usually require the inclusion of three-dimensional effects to correlate separation lengths with experimental measurements. Moreover, in the presence of large recirculation regions, the heat transfer calculated over the compression ramp severely underestimate experimental values. This discrepancy could be explained at least in part by the presence and effects of centrifugal disturbances. Indeed the regular striation patterns in heat transfer rates seen in experiments suggest this. In the present work numerical simulations were carried out over three-dimensional 15° compression ramps in a laminar hypersonic flow at Mach 6.85 and a Reynolds number per unit length of 2.45 × 106 m?1. The relatively high Görtler numbers obtained suggested that Görtler vortices might be important. In most cases, a spanwise periodic velocity perturbation is imposed on the flat plate ahead of separation. However for one case, which had a grid with a higher spanwise resolution, a regular striation pattern emerged without forcing. In this case, the pattern had a wavelength comparable to that found in experiments and as predicted from linear theory. A spanwise variation of 5–15% in the heat transfer close to the centreline was obtained in this case.
0045-7930
225-247
Navarro-Martinez, S.
a182c0e6-61af-4064-a9d8-4c0881ef943b
Tutty, O.R.
c9ba0b98-4790-4a72-b5b7-09c1c6e20375
Navarro-Martinez, S.
a182c0e6-61af-4064-a9d8-4c0881ef943b
Tutty, O.R.
c9ba0b98-4790-4a72-b5b7-09c1c6e20375

Navarro-Martinez, S. and Tutty, O.R. (2005) Numerical simulation of Görtler vortices in hypersonic compression ramps. Computers & Fluids, 34 (2), 225-247. (doi:10.1016/j.compfluid.2004.05.002).

Record type: Article

Abstract

A numerical study of the formation and evolution of Görtler type vortices over a compression ramp under an hypersonic flow is presented. Numerical predictions in laminar compression ramps (body/body-flaps configurations) usually require the inclusion of three-dimensional effects to correlate separation lengths with experimental measurements. Moreover, in the presence of large recirculation regions, the heat transfer calculated over the compression ramp severely underestimate experimental values. This discrepancy could be explained at least in part by the presence and effects of centrifugal disturbances. Indeed the regular striation patterns in heat transfer rates seen in experiments suggest this. In the present work numerical simulations were carried out over three-dimensional 15° compression ramps in a laminar hypersonic flow at Mach 6.85 and a Reynolds number per unit length of 2.45 × 106 m?1. The relatively high Görtler numbers obtained suggested that Görtler vortices might be important. In most cases, a spanwise periodic velocity perturbation is imposed on the flat plate ahead of separation. However for one case, which had a grid with a higher spanwise resolution, a regular striation pattern emerged without forcing. In this case, the pattern had a wavelength comparable to that found in experiments and as predicted from linear theory. A spanwise variation of 5–15% in the heat transfer close to the centreline was obtained in this case.

This record has no associated files available for download.

More information

Published date: 2005

Identifiers

Local EPrints ID: 23658
URI: http://eprints.soton.ac.uk/id/eprint/23658
ISSN: 0045-7930
PURE UUID: f9319bc5-8c33-4482-bfc9-6f67e505b26d

Catalogue record

Date deposited: 21 Mar 2006
Last modified: 15 Mar 2024 06:49

Export record

Altmetrics

Contributors

Author: S. Navarro-Martinez
Author: O.R. Tutty

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×