TY - GEN
T1 - DNS of three-dimensional separation in turbulent diffuser flows
AU - Ohlsson, Johan
AU - Schlatter, Philipp
AU - Fischer, Paul F.
AU - Henningson, Dan S.
N1 - Publisher Copyright:
© 2009, Springer-Verlag Berlin Heidelberg.
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
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U2 - 10.1007/978-3-642-03085-7_154
DO - 10.1007/978-3-642-03085-7_154
M3 - Conference contribution
AN - SCOPUS:84858379790
SN - 9783642030840
T3 - Advances in Turbulence XII - Proceedings of the 12th EUROMECH European Turbulence Conference
SP - 641
EP - 644
BT - Advances in Turbulence XII - Proceedings of the 12th EUROMECH European Turbulence Conference
PB - Springer
T2 - 12th EUROMECH European Turbulence Conference, ETC 12
Y2 - 7 September 2009 through 10 September 2009
ER -