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On invariants in grid turbulence at moderate Reynolds numbers

Published online by Cambridge University Press:  06 December 2013

T. Kitamura ,
K. Nagata ,
Y. Sakai ,
A. Sasoh ,
O. Terashima ,
H. Saito  and
T. Harasaki
T. Kitamura
Affiliation:
Department of Mechanical Science and Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
K. Nagata*
Affiliation:
Department of Mechanical Science and Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
Y. Sakai
Affiliation:
Department of Mechanical Science and Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
A. Sasoh
Affiliation:
Department of Aerospace Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
O. Terashima
Affiliation:
Department of Mechanical Science and Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
H. Saito
Affiliation:
Department of Mechanical Science and Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
T. Harasaki
Affiliation:
Department of Aerospace Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
*
†Email address for correspondence: nagata@nagoya-u.jp
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Abstract

The decay characteristics and invariants of grid turbulence were investigated by means of laboratory experiments conducted in a wind tunnel. A turbulence-generating grid was installed at the entrance of the test section for generating nearly isotropic turbulence. Five grids (square bars of mesh sizes $M= 15$, 25 and 50 mm and cylindrical bars of mesh sizes $M= 10$ and 25 mm) were used. The solidity of all grids is $\sigma = 0. 36$. The instantaneous streamwise and vertical (cross-stream) velocities were measured by hot-wire anemometry. The mesh Reynolds numbers were adjusted to $R{e}_{M} = 6700$, 9600, 16 000 and 33 000. The Reynolds numbers based on the Taylor microscale $R{e}_{\lambda } $ in the decay region ranged from 27 to 112. In each case, the result shows that the decay exponent of turbulence intensity is close to the theoretical value of ${- }6/ 5$ (for the $M= 10~\mathrm{mm} $ grid, ${- }6(1+ p)/ 5\sim - 1. 32$) for Saffman turbulence. Here, $p$ is the power of the dimensionless energy dissipation coefficient, $A(t)\sim {t}^{p} $. Furthermore, each case shows that streamwise variations in the integral length scales, ${L}_{uu} $ and ${L}_{vv} $, and the Taylor microscale $\lambda $ grow according to ${L}_{uu} \sim 2{L}_{vv} \propto {(x/ M- {x}_{0} / M)}^{2/ 5} $ (for the $M= 10~\mathrm{mm} $ grid, ${L}_{uu} \propto {(x/ M- {x}_{0} / M)}^{2(1+ p)/ 5} \sim {(x/ M- {x}_{0} / M)}^{0. 44} $) and $\lambda \propto {(x/ M- {x}_{0} / M)}^{1/ 2} $, respectively, at $x/ M\gt 40{\unicode{x2013}} 60$ (depending on the experimental conditions, including grid geometry), where $x$ is the streamwise distance from the grid and ${x}_{0} $ is the virtual origin. We demonstrated that in the decay region of grid turbulence, ${ u}_{\mathit{rms}}^{2} { L}_{uu}^{3} $ and ${ v}_{\mathit{rms}}^{2} { L}_{vv}^{3} $, which correspond to Saffman’s integral, are constant for all grids and examined $R{e}_{M} $ values. However, ${ u}_{\mathit{rms}}^{2} { L}_{uu}^{5} $ and ${ v}_{\mathit{rms}}^{2} { L}_{vv}^{5} $, which correspond to Loitsianskii’s integral, and ${ u}_{\mathit{rms}}^{2} { L}_{uu}^{2} $ and ${ v}_{\mathit{rms}}^{2} { L}_{vv}^{2} $, which correspond to the complete self-similarity of energy spectrum and $\langle {\boldsymbol{u}}^{2} \rangle \sim {t}^{- 1} $, are not constant. Consequently, we conclude that grid turbulence is a type of Saffman turbulence for the examined $R{e}_{M} $ range of 6700–33 000 ($R{e}_{\lambda } = 27{\unicode{x2013}} 112$) regardless of grid geometry.

JFM classification

Turbulent Flows: Turbulent Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 738 , 10 January 2014 , pp. 378 - 406
Copyright
©2013 Cambridge University Press 

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