Computational analysis of partially-covered cavity with and without side walls
Computational analysis of partially-covered cavity with and without side walls
A subsonic three-dimensional cavity with a cover over the first two-thirds of the length was simulated using Delayed Detached Eddy Simulation. Two geometric set-ups were investigated: one is a quasi-3D simulation, with no side walls and a spanwise-periodic boundary condition, and the other is a fully-3D simulation, with resolved no-slip side walls and a surrounding plate section. In both cases a large counter-rotating vortex pair was observed inside the cavity, and the unsteady shear layer over the open section of the cavity produces regular vortex shedding. However, the presence of the side-walls causes the vortices to quickly break down in the span direction; the simulation without side walls maintains stronger, spanwise-coherent vortices for a much longer time. In both simulations the frequencies were found to agree well with Rossiter-mode cavity resonance based on the open section of the cavity. However, the presence of the side walls shifts the dominant modes, from modes 2 and 4 in the spanwise-periodic simulation, to modes 1 and 2 in the side-wall simulation. The side walls also cause a strong resonance at the mode 1 frequency in the covered section of the cavity, which was not observed with the spanwise-periodic boundary condition.
1-17
American Institute of Aeronautics and Astronautics
Premachandran, Sarah
03225567-6703-4e07-95de-c12d5fbd4b1e
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Premachandran, Sarah
03225567-6703-4e07-95de-c12d5fbd4b1e
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Premachandran, Sarah, Hu, Zhiwei and Zhang, Xin
(2016)
Computational analysis of partially-covered cavity with and without side walls.
In 8th AIAA Flow Control Conference.
American Institute of Aeronautics and Astronautics.
.
(doi:10.2514/6.2016-3174).
Record type:
Conference or Workshop Item
(Paper)
Abstract
A subsonic three-dimensional cavity with a cover over the first two-thirds of the length was simulated using Delayed Detached Eddy Simulation. Two geometric set-ups were investigated: one is a quasi-3D simulation, with no side walls and a spanwise-periodic boundary condition, and the other is a fully-3D simulation, with resolved no-slip side walls and a surrounding plate section. In both cases a large counter-rotating vortex pair was observed inside the cavity, and the unsteady shear layer over the open section of the cavity produces regular vortex shedding. However, the presence of the side-walls causes the vortices to quickly break down in the span direction; the simulation without side walls maintains stronger, spanwise-coherent vortices for a much longer time. In both simulations the frequencies were found to agree well with Rossiter-mode cavity resonance based on the open section of the cavity. However, the presence of the side walls shifts the dominant modes, from modes 2 and 4 in the spanwise-periodic simulation, to modes 1 and 2 in the side-wall simulation. The side walls also cause a strong resonance at the mode 1 frequency in the covered section of the cavity, which was not observed with the spanwise-periodic boundary condition.
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Submitted date: 28 May 2016
Accepted/In Press date: 1 June 2016
e-pub ahead of print date: 13 June 2016
Venue - Dates:
8th AIAA Flow Control Conference, Washington, United States, 2016-06-13 - 2016-06-17
Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 399630
URI: http://eprints.soton.ac.uk/id/eprint/399630
PURE UUID: 340d4d81-261d-4617-83f5-136bb56774ae
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Date deposited: 22 Aug 2016 13:16
Last modified: 15 Mar 2024 18:31
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Author:
Sarah Premachandran
Author:
Xin Zhang
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