Applied Mathematics and Mechanics >
Response of turbulent enstrophy to sudden implementation of spanwise wall oscillation in channel flow
Received date: 2016-10-03
Revised date: 2016-12-21
Online published: 2017-08-01
Supported by
Project supported by the National Natural Science Foundation of China (Nos. 11402088 and 51376062), the Opening Fund of State Key Laboratory of Nonlinear Mechanics, and the Fundamental Research Funds for the Central Universities (No. 2107MS022)
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 ωz), the inclination of ω'y by ∂w/∂y, the turn of ωz by ∂v'/∂z, and the horizontal shear of ωz by ∂w'/∂x are suppressed due to the presence of SWO, leading to attenuation of the turbulent enstrophy.
Mingwei GE, Guodong JIN . Response of turbulent enstrophy to sudden implementation of spanwise wall oscillation in channel flow[J]. Applied Mathematics and Mechanics, 2017 , 38(8) : 1159 -1170 . DOI: 10.1007/s10483-017-2226-9
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