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From isotropic turbulence in triply periodic cubic domains to sheared turbulence with inflow/outflow

Dhandapani, Chandru and Blanquart, Guillaume (2020) From isotropic turbulence in triply periodic cubic domains to sheared turbulence with inflow/outflow. Physical Review Fluids, 5 (12). Art. No. 124605. ISSN 2469-990X. doi:10.1103/physrevfluids.5.124605.

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Homogeneous shear turbulence (HST) is an idealized version of the shear turbulence observed in practical free shear flows, and can be simulated using simple computational domains. One of the numerically efficient configurations to simulate turbulent flows is to use triply periodic domains. However, owing to the mean streamwise velocity being nonhomogeneous, periodic boundary conditions cannot be used along one of the directions. Several studies included shear periodic boundary conditions in the cross-stream direction. However, in these simulations, the turbulence statistics grew exponentially with time, whereas the turbulence observed in free shear flows is statistically stationary. In Dhandapani et al. [Phys. Rev. Fluids 4, 084606 (2019)], the authors fixed this problem by focusing on the velocity fluctuations, performing HST simulations with only shear production and neglecting shear convection. The current study improves upon the previous simulations by including shear convection, by introducing an inflow/outflow in the cross-stream direction. To reduce the impact of the boundary conditions, an elongated domain is used. The simulation results show that the aspect ratio has very little effect on both isotropic and shear turbulence. When convection is included, the turbulence statistics still reach a statistically stationary state. The Reynolds shear stress and the anisotropy values agree very well with the results from experiments and simulations of mixing layers, planar jets, and round jets.

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Dhandapani, Chandru0000-0002-7319-557X
Blanquart, Guillaume0000-0002-5074-9728
Additional Information:© 2020 American Physical Society. (Received 8 October 2019; accepted 4 November 2020; published 17 December 2020)
Issue or Number:12
Record Number:CaltechAUTHORS:20210114-143037936
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107485
Deposited By: George Porter
Deposited On:14 Jan 2021 22:55
Last Modified:16 Nov 2021 19:03

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