Unsteady RANS simulation of turbulent cavity flow: summary of 2D baseline computations


  • Peng Shia-Hui

Publish date: 2006-01-01

Report number: FOI-R--1915--SE

Pages: 32

Written in: English


A number of computations have been carried out for the flow over a rectangular open cavity that is similar to a weapon-bay geometry at a Mach number of M8 = 0.85. The calculations have been made for a 2D cavity configuration with an aspect ratio of 5 (a ratio between the cavity length and the cavity depth) using unsteady RANS (URANS) modelling. The simulation serves as baseline-type computations, with an effort to efficiently investigate some numerical issues encountered commonly in industrial CFD modelling for 2D cavity flows. As a result, it is expected that such an investigation may give some implications to 3D URANS and DES (detached eddy simulation) modelling based on a 3D cavity geometry. This memorandum summarizes the results of 2D URANS computations in analysis of wall-pressure fluctuations at the cavity floor in terms of the power spectral density (PSD) and sound pressure level (SPL). The results have been compared with available experimental measurements. The emphasis is placed on the effect of grid resolution with four different meshes. It is shown that the results are very sensitive to the grid resolution for the incoming boundary layer and for the shear layer over the cavity opening.

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