Large-Eddy simulation of non-homogeneous turbulence subjected to sudden distortion

Afsar, Mohammed and Kokkinakis, Ioannis and Stirrat, Sarah (2020) Large-Eddy simulation of non-homogeneous turbulence subjected to sudden distortion. In: Seventeenth International Conference on Flow Dynamics, 2020-10-28 - 2020-10-30, Virtual Conference and Tohoku University.

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Abstract

In this paper we investigate the distortion of an unsteady flow through a two-dimensional sudden area expansion using LargeEddy Simulations. We perform a series of numerical experiments at various Mach numbers (Mb = (0.1, 0.5)) based on the inlet volume flow rate and fixed O(1) contraction ratio. At Mb = 0.1, we find that the transverse components of the auto-correlation of the two-point time-delayed velocity correlation tensor de-correlates slower in the downstream expansion compared to the channel section. We discuss this result in the context of classical and rapid-distortion theory.

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