Turbulence dissipation and the role of coherent structures in the near wake of a square prism | Zendy

F. Alves Portela | Zendy; George Papadakis | Zendy; J. C. Vassilicos | Zendy

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Turbulence dissipation and the role of coherent structures in the near wake of a square prism

Author(s) -

F. Alves Portela,

George Papadakis,

J. C. Vassilicos

Publication year - 2018

Publication title -

physical review fluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.244

H-Index - 37

eISSN - 2469-9918

pISSN - 2469-990X

DOI - 10.1103/physrevfluids.3.124609

Subject(s) - wake , dissipation , lagrangian coherent structures , physics , turbulence , scaling , square (algebra) , planar , statistical physics , classical mechanics , prism , scale (ratio) , mechanics , optics , geometry , mathematics , quantum mechanics , computer science , computer graphics (images)

Between streamwise distances 4d and at least 10d in the planar turbulent wake of a square prism of side length d , the turbulent fluctuating velocities are highly nonGaussian, the turbulent energy spectrum has a close to −5/3 power law range, and the turbulence dissipation rate obeys the nonequilibrium dissipation scaling if the energy of the coherent structures is not included in the scaling. In this same range of streamwise distances, the coherent structure dissipation rate decays proportionally to the stochastic turbulence dissipation rate and there is a strong tendency of alignment or antialignment between fluctuating velocities and fluctuating vorticities which appears to coincide with the presence of coherent structures.

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