Abstract
Two Direct Numerical Simulations (DNS) of a converging–diverging channel flows were performed at Re τ = 395 and Re τ =617. The present DNS of adverse pressure gradient flow were designed within the WALLTURB project to meet two main objectives. The first one was to gather three-dimensional fully resolved data in order to investigate statistics and coherent structures of turbulence under strong pressure gradient with and without curvature. The second one was to have a reference for the evaluation of RANS and LES models. The flow slightly separates at the lower curved wall and is at the onset of separation at the opposite flat wall. Intense vortices are generated at the location of the minimum friction velocity even without averaged recirculation. The full budget of the Reynolds stresses were computed along the channel at both walls. The occurrence of a well documented secondary peak of velocity fluctuations due to adverse pressure gradient is shown to be the consequence of a very strong production peak.
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Acknowledgements
This work was supported by WALLTURB (A European synergy for the assessment of wall turbulence) which is funded by the EC under the 6th framework program (CONTRACT: AST4-CT-2005-516008). The largest DNS was performed through two successive DEISA Extreme Computing Initiatives (DEISA is a Distributed European Infrastructure for Supercomputing Applications). The other calculations were done at IDRIS (French CNRS Computing Facilities) and at CRIHAN (Centre de Ressources Informatiques de HAute-Normandie).
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Laval, JP., Marquillie, M. (2011). Direct Numerical Simulations of Converging–Diverging Channel Flow. In: Stanislas, M., Jimenez, J., Marusic, I. (eds) Progress in Wall Turbulence: Understanding and Modeling. ERCOFTAC Series, vol 14. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9603-6_21
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DOI: https://doi.org/10.1007/978-90-481-9603-6_21
Publisher Name: Springer, Dordrecht
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