Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Turbulence in the highly restricted dynamics of a closure at second order: comparison with DNS
Year:2014
Research Areas
  • Fluid mechanics,
  • Turbulence
Information
Abstract
S3T (Stochastic Structural Stability Theory) employs a closure at second order to obtain the dynamics of the statistical mean turbulent state. When S3T is implemented as a coupled set of equations for the streamwise mean and perturbation states, nonlinearity in the dynamics is restricted to interaction between the mean and perturbations. The S3T statistical mean state dynamics can be approximately implemented by similarly restricting the dynamics used in a direct numerical simulation (DNS) of the full Navier-Stokes equations (referred to as the NS system). Although this restricted nonlinear system (referred to as the RNL system) is greatly simplified in its dynamics in comparison to the associated NS, it nevertheless self-sustains a turbulent state in wall-bounded shear flow with structures and dynamics comparable to those observed in turbulence. Moreover, RNL turbulence can be analysed effectively using theoretical methods developed to study the closely related S3T system. In order to better understand RNL turbulence and its relation to NS turbulence, an extensive comparison is made of diagnostics of structure and dynamics in these systems. Although quantitative differences are found, the results show that turbulence in the RNL system closely parallels that in NS and suggest that the S3T/RNL system provides a promising reduced complexity model for studying turbulence in wall-bounded shear flows.
International
Si
JCR
Si
Title
Journal of Physics: Conference Series
ISBN
1742-6596
Impact factor JCR
Impact info
Volume
506
10.1088/1742-6596/506/1/012004
Journal number
From page
ref 012004
To page
ref 012004
Month
SIN MES
Ranking
Participants
  • Autor: Navid N Constantinou (University of Athens, Department of Physics)
  • Autor: Adrian Lozano Duran (UPM)
  • Autor: Mario A. Nikolaidis (University of Athens, Department of Physics)
  • Autor: Brien Farrell (Department of Earth and Planetary Sciences, Harvard University)
  • Autor: Petros J. Ioannou (University of Athens, Department of Physics)
  • Autor: Javier Jimenez Sendin (UPM)
Research Group, Departaments and Institutes related
  • Creador: Departamento: Mecánica de Fluidos y Propulsión Aeroespacial
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)