Surface roughness benefits in open cavity flows

Nampelly, G., Malathi, A. S., Vadlamani, N. R., Rengarajan, S. and Kontis, K. (2021) Surface roughness benefits in open cavity flows. In: AIAA SCITECH 2022 Forum, San Diego, CA & Virtual, 3-7 January 2022, ISBN 9781624106316 (doi: 10.2514/6.2022-0473)

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In the current study, we report the effect of distributed roughness elements on the flow characteristics within a rectangular cavity using a series of high-fidelity eddy-resolving simulations. A cavity with a length to depth ratio (L/D) of 3 is considered. Simulations are carried out at a Mach number of 0.2 and Reynolds numbers of 7000 and 19300, based on the free-stream velocity and the depth of the cavity. The cavity flows generate undesirable low-frequency pressure fluctuations due to the vortex impingement over the trailing edge of the cavity. We explore the possibility of employing distributed hemispherical roughness elements as a passive flow control strategy towards suppressing these pressure fluctuations. The roughness elements, modeled using the immersed boundary method, are placed upstream of the cavity leading edge and distributed along the span. For a given roughness configuration, we studied the effect of varying Reynolds numbers on the flow features generated by the roughness elements and their interaction with the growth of the separated shear layer using instantaneous and time-averaged flow fields. The roughness elements are shown to effectively reduce the sound pressure level (SPL) up to 7dB for the test cases considered.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Kontis, Professor Konstantinos
Authors: Nampelly, G., Malathi, A. S., Vadlamani, N. R., Rengarajan, S., and Kontis, K.
College/School:College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
Published Online:29 December 2021
Copyright Holders:Copyright © 2022 by the American Institute of Aeronautics and Astronautics, Inc
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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