DNS of three-dimensional separation in turbulent diffuser flows

Johan Ohlsson, Philipp Schlatter, Paul F. Fischer, Dan S. Henningson

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The spectral-element method (SEM), is a high-order numerical method with the ability to accurately simulate fluid flows in complex geometries. SEM has opened the possibility to study – in great detail – fluid phenomena known to be very sensitive to discretization errors, e.g. flows undergoing pressureinduced separation [4]. Recently, Cherry et al. [1] performed experiments using Magnetic Resonance Velocimetry (MRV) of turbulent diffuser flow exhibiting unsteady three-dimensional separation at Re = 10 000 based on bulk velocity and height of the inflow duct. Two geometries with different opening angles were investigated and it was found that the flow was extremely sensitive to slight changes in the geometrical setup. To understand this sensitivity and to analyze its causes, we present a direct numerical simulation (DNS) of one of these cases (denoted by “Diffuser 1“ in [1]) by means of the SEM. Here, we focus on careful analysis of mean flow results in order to assess the quality of the simulation data.

Original languageEnglish (US)
Title of host publicationAdvances in Turbulence XII - Proceedings of the 12th EUROMECH European Turbulence Conference, 2009
EditorsBruno Eckhardt
Number of pages4
ISBN (Print)9783642030840
StatePublished - 2009
Externally publishedYes
Event12th EUROMECH European Turbulence Conference, ETC12 2009 - Marburg, Germany
Duration: Sep 7 2009Sep 10 2009

Publication series

NameSpringer Proceedings in Physics
ISSN (Print)0930-8989
ISSN (Electronic)1867-4941


Conference12th EUROMECH European Turbulence Conference, ETC12 2009


  • Direct Numerical Simulation
  • Discretization Error
  • Friction Reynolds Number
  • Geometrical Setup
  • Magnetic Resonance Velocimetry

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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