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SUPERSONIC TURBULENT FLOW IN AXISYMMETRIC NOZZLES AND DIFFUSERS

Somnath Ghosh
Lehrstuhl für Aerodynamik, Technische Universität München Boltzmannstrasse 15, D-85748 Garching, Germany; Department of Aerospace Engineering, Indian Institute of Technology, Kharagpur, India

Joern L. Sesterhenn
Fachgebiet Stromungsmechanik, Technische Universitat Munchen, Boltzmannstr. 15, D-85748 Garching; Department of Numerical Mathematics (LRT1), Universitat der Bundeswehr (UniBw) Munchen D-85577 Munich, Germany

Rainer Friedrich
Lehrstuhl für Aerodynamik, Technische Universität München Boltzmannstrasse 15, D-85748 Garching, Germany

Abstract

Effects of extra strain and dilatation rates on the turbulence structure in nozzles and diffusers with fully developed supersonic pipe flow as inflow condition are investigated by means of DNS and LES using high-order numerical schemes. It is found that weak pressure gradients already strongly inhibit or enhance the Reynolds stresses via corresponding changes of production and pressure-strain terms. The results constitute a database for the improvement of turbulence models for compressible flow.