TY - JOUR
T1 - Turbulence anisotropy with higher-order moments in flow through passive grid under rigid boundary influence
AU - Raushan, Pankaj Kumar
AU - Singh, Santosh Kumar
AU - Debnath, Koustuv
N1 - Publisher Copyright:
© IMechE 2020.
PY - 2021/10
Y1 - 2021/10
N2 - The investigation presents the estimate of the degree of deviation from the isotropic turbulence in terms of Reynolds stress tensor for grid generated turbulence under the influence of bottom boundary. The turbulence triangle, Eigen values, and the invariant functions are presented at near and far field regions of the grids with different solidity ratio. In addition, the work also deals with the analysis based on third-order moments of the velocity fluctuations and the ratio of momentum flux to the turbulent kinetic energy in the frequency domain. The Reynolds stress anisotropy exposes that the anisotropic invariant maps possess a closed looping trend in the near field region and an open looping trend in the far-field region of the grid. Further, to describe the physical behaviour of the velocity time-series of random fluctuating components in the stream-wise directions, the probability distribution function are estimated and interpreted.
AB - The investigation presents the estimate of the degree of deviation from the isotropic turbulence in terms of Reynolds stress tensor for grid generated turbulence under the influence of bottom boundary. The turbulence triangle, Eigen values, and the invariant functions are presented at near and far field regions of the grids with different solidity ratio. In addition, the work also deals with the analysis based on third-order moments of the velocity fluctuations and the ratio of momentum flux to the turbulent kinetic energy in the frequency domain. The Reynolds stress anisotropy exposes that the anisotropic invariant maps possess a closed looping trend in the near field region and an open looping trend in the far-field region of the grid. Further, to describe the physical behaviour of the velocity time-series of random fluctuating components in the stream-wise directions, the probability distribution function are estimated and interpreted.
KW - grid generated turbulence
KW - Higher order turbulence
KW - invariant function
KW - probability distribution function
KW - turbulence triangle
UR - http://www.scopus.com/inward/record.url?scp=85094644746&partnerID=8YFLogxK
U2 - 10.1177/0954406220969736
DO - 10.1177/0954406220969736
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AN - SCOPUS:85094644746
SN - 0954-4062
VL - 235
SP - 3859
EP - 3874
JO - Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
JF - Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
IS - 19
ER -