Generalized boundary dilatation flux on a flexible wall

Chen, Tao1; Liu, Tianshu2

2022-11-01

10.1016/j.taml.2022.100388

Theoretical and Applied Mechanics Letters   Impact Factor & Quartile

2095-0349

In this paper, by applying theoretical method to the governing equations of compressible viscous flow, we derive the theoretical formula of the boundary dilatation flux (BDF) on a flexible wall, which generalizes the most recent work of Mao et al. (Acta Mechanica Sinica 38 (2022) 321583) for a stationary wall. Different boundary sources of dilatation are explicitly identified, revealing not only the boundary generation mechanisms of vortex sound and entropy sound, but also some additional sources due to the surface vorticity, surface angular velocity, surface acceleration and surface curvature. In particular, the generation mechanism of dilatation at boundary due to the coupled divergence terms is highlighted, namely, the product of the surface velocity divergence (del(partial derivative B) . U) and the vorticity-induced skin friction divergence (del(partial derivative B) . tau(omega)). The former is attributed to the surface flexibility while the latter characterizes the footprints of near-wall coherent structures. Therefore, by properly designing the surface velocity distribution, the dilatation generation at the boundary could be controlled for practical purpose in near-wall compressible viscous flows. (c) 2022 The Author(s). Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Boundary dilatation flux Surface deformation Boundary vorticity dynamics Near-wall flow

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English

First ; Corresponding

Mechanics

Mechanics

WOS:000910891100001

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1.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
2.Western Michigan Univ, Dept Mech & Aerosp Engn, Kalamazoo, MI 49008 USA

Chen, Tao,Liu, Tianshu. Generalized boundary dilatation flux on a flexible wall[J]. Theoretical and Applied Mechanics Letters,2022,12(6).

Chen, Tao,&Liu, Tianshu.(2022).Generalized boundary dilatation flux on a flexible wall.Theoretical and Applied Mechanics Letters,12(6).

Chen, Tao,et al."Generalized boundary dilatation flux on a flexible wall".Theoretical and Applied Mechanics Letters 12.6(2022).