Direct Numerical Simulation of Nozzle-Wall Pressure Fluctuations in a Mach 8 Wind Tunnel
Direct numerical simulations (DNS) of the full-scale axisymmetric nozzle of a Mach 8 wind tunnel are conducted with an emphasis on characterizing the properties of the pressure fluctuations induced by the turbulent boundary layer (TBL) along the nozzle wall. The axisymmetric nozzle geometry and the flow conditions of the DNS match those of the Sandia Hypersonic Wind Tunnel at Mach 8. The mean and turbulence statistics of the nozzle-wall boundary layer show good agreement with those predicted by Pate's correlation and Reynolds Averaged Navier-Stokes (RANS) computations. The wall-pressure intensity, power spectral density, and coherence predicted by DNS show good comparisons with those measured in the same tunnel. The Corcos model is found to deliver good prediction of wall pressure coherence over intermediate and high frequencies. The streamwise and spanwise decay constants at Mach 8 are similar to those predicted by DNS and experiments at lower supersonic Mach numbers.
L. Duan et al., "Direct Numerical Simulation of Nozzle-Wall Pressure Fluctuations in a Mach 8 Wind Tunnel," Proceedings of the AIAA Scitech 2019 Forum (2019, San Diego, CA), American Institute of Aeronautics and Astronautics (AIAA), Jan 2019.
The definitive version is available at https://doi.org/10.2514/6.2019-0874
AIAA Scitech Forum, 2019 (2019: Jan. 7-11, San Diego, CA)
Mechanical and Aerospace Engineering
Keywords and Phrases
Atmospheric thermodynamics; Aviation; Boundary layer flow; Boundary layers; Direct numerical simulation; Navier Stokes equations; Nozzles; Numerical models; Spectral density; Turbulence, Axisymmetric nozzles; Decay constants; High frequency HF; Hypersonic wind tunnels; Pressure fluctuation; Reynolds-Averaged Navier-Stokes; Turbulence statistics; Turbulent boundary layers, Wind tunnels
International Standard Book Number (ISBN)
Article - Conference proceedings
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