Direct numerical simulation of statistically stationary and homogeneous shear turbulence and its relation to other shear flows

Atshusi, Sekimoto and Siwei, Dong and Jiménez Sendín, Javier (2016). Direct numerical simulation of statistically stationary and homogeneous shear turbulence and its relation to other shear flows. "Physics of Fluids", v. 28 (n. 3); pp. 1-27. ISSN 1089-7666. https://doi.org/10.1063/1.4942496.

Description

Title: Direct numerical simulation of statistically stationary and homogeneous shear turbulence and its relation to other shear flows
Author/s:
  • Atshusi, Sekimoto
  • Siwei, Dong
  • Jiménez Sendín, Javier
Item Type: Article
Título de Revista/Publicación: Physics of Fluids
Date: 1 March 2016
ISSN: 1089-7666
Volume: 28
Subjects:
Faculty: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Department: Mecánica de Fluidos y Propulsión Aeroespacial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Statistically stationary and homogeneous shear turbulence (SS-HST) is investigated by means of a new direct numerical simulation code, spectral in the two horizontal directions and compact-finite-differences in the direction of the shear. No remeshing is used to impose the shear-periodic boundary condition. The influence of the geometry of the computational box is explored. Since HST has no characteristic outer length scale and tends to fill the computational domain, long-term simulations of HST are “minimal” in the sense of containing on average only a few large-scale structures. It is found that the main limit is the spanwise box width, Lz, which sets the length and velocity scales of the turbulence, and that the two other box dimensions should be sufficiently large (Lx ≳ 2Lz, Ly ≳ Lz) to prevent other directions to be constrained as well. It is also found that very long boxes, Lx ≳ 2Ly, couple with the passing period of the shear-periodic boundary condition, and develop strong unphysical linearized bursts. Within those limits, the flow shows interesting similarities and differences with other shear flows, and in particular with the logarithmic layer of wall-bounded turbulence. They are explored in some detail. They include a self-sustaining process for large-scale streaks and quasi-periodic bursting. The bursting time scale is approximately universal, ∼20S−1, and the availability of two different bursting systems allows the growth of the bursts to be related with some confidence to the shearing of initially isotropic turbulence. It is concluded that SS-HST, conducted within the proper computational parameters, is a very promising system to study shear turbulence in general.

More information

Item ID: 40282
DC Identifier: http://oa.upm.es/40282/
OAI Identifier: oai:oa.upm.es:40282
DOI: 10.1063/1.4942496
Official URL: https://doi.org/10.1063/1.4942496
Deposited by: Memoria Investigacion
Deposited on: 12 Sep 2016 06:53
Last Modified: 13 Mar 2019 17:50
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