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Abstract
The present work provides the turbulence characteristics of oscillating flow through passive grid under rigid boundary influence by adopting an experimental approach. The oscillations in the steady unidirectional flow were generated by plunger type wave-maker. This study attempts to analyse the turbulent length scales and local Reynolds numbers in order to characterise the different eddy sizes in the oscillating flow environment due to the interaction of grid and rigid boundary. The normalized phase averaged Shannon entropy is also presented to understand the degree of the randomness in oscillating flow environment through the passive grid. Further, to understand the deviation from the isotropic turbulence, the turbulence triangle, Eigen values, and the invariant functions are presented at the downstream of the grid for the three oscillating flow cases.
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