Response of turbulent enstrophy to sudden implementation of spanwise wall oscillation in channel flow

doi:10.1007/s10483-017-2226-9

Abstract

Abstract:

The response of turbulent enstrophy to a sudden implementation of spanwise wall oscillation (SWO) is studied in a turbulent channel flow via direct numerical simulation. In the beginning of the application of SWO, a significant correlation is formed between ω'_y and ω'_z. A transient growth of turbulent enstrophy occurs, which directly enhances turbulent dissipation and drifts the turbulent flow towards a new lower-drag condition. Afterwards, the terms related to the stretching of vorticity (ωx, ω'_y, and ω_z), the inclination of ω'_y by ∂w/∂y, the turn of ω_z by ∂v'/∂z, and the horizontal shear of ω_z by ∂w'/∂x are suppressed due to the presence of SWO, leading to attenuation of the turbulent enstrophy.

Key words: anisotropic media, SH-wave, displacement amplitude, canyon topography with lining, drag reduction, turbulent channel flow, transport of enstrophy, spanwise wall oscillation (SWO)

2010 MSC Number:

76F40

Mingwei GE, Guodong JIN. Response of turbulent enstrophy to sudden implementation of spanwise wall oscillation in channel flow. Applied Mathematics and Mechanics (English Edition), 2017, 38(8): 1159-1170.

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