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/content/aip/journal/pof2/27/7/10.1063/1.4926356
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/content/aip/journal/pof2/27/7/10.1063/1.4926356
2015-07-06
2016-09-25

Abstract

The evolution of the velocity derivative skewness, (∂/∂), is investigated along two streamwise axes and four transverse positions in the wake of a square-fractal-element grid. In the near-field, the produced turbulence exhibits non-equilibrium characteristics including . In the far-field, the turbulence agrees with canonical grid turbulence results and is approximately constant. It is found that in the non-equilibrium region, the value of −(∂/∂) is dependent on both streamwise and transverse positions, but after a sufficient decay period, it takes on a near constant value in the far-field. It is demonstrated that the evolution approximately corresponds to that of −(∂/∂), which is suggestive that some of the non-equilibrium properties are likely a result of residual strain from the turbulence generating conditions.

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