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

Atshusi, Sekimoto; Siwei, Dong y 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.

Descripción

Título: Direct numerical simulation of statistically stationary and homogeneous shear turbulence and its relation to other shear flows
Autor/es:
  • Atshusi, Sekimoto
  • Siwei, Dong
  • Jiménez Sendín, Javier
Tipo de Documento: Artículo
Título de Revista/Publicación: Physics of Fluids
Fecha: 1 Marzo 2016
Volumen: 28
Materias:
Escuela: E.T.S. de Ingeniería Aeronáutica y del Espacio (UPM)
Departamento: Mecánica de Fluidos y Propulsión Aeroespacial
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

Texto completo

[img]
Vista Previa
PDF (Document Portable Format) - Se necesita un visor de ficheros PDF, como GSview, Xpdf o Adobe Acrobat Reader
Descargar (431kB) | Vista Previa

Resumen

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.

Más información

ID de Registro: 40282
Identificador DC: http://oa.upm.es/40282/
Identificador OAI: oai:oa.upm.es:40282
Identificador DOI [BETA]: 10.1063/1.4942496
URL Oficial: http://scitation.aip.org/content/aip/journal/pof2/28/3/10.1063/1.4942496
Depositado por: Memoria Investigacion
Depositado el: 12 Sep 2016 06:53
Ultima Modificación: 01 Abr 2017 22:30
  • Open Access
  • Open Access
  • Sherpa-Romeo
    Compruebe si la revista anglosajona en la que ha publicado un artículo permite también su publicación en abierto.
  • Dulcinea
    Compruebe si la revista española en la que ha publicado un artículo permite también su publicación en abierto.
  • Recolecta
  • e-ciencia
  • Observatorio I+D+i UPM
  • OpenCourseWare UPM