Author:
Mitchell Brian E.,Lele Sanjiva K.,Moin Parviz
Abstract
The far-field sound generated by compressible co-rotating vortices is
computed by direct computation of the unsteady compressible Navier–Stokes
equations on a computational domain that extends to two acoustic wavelengths
in all directions. The vortices undergo a period of co-rotation followed by
a sudden merger. The directly computed far-field sound is compared to the
prediction of the acoustic analogy due to Möhring (1978, 1979), a modified
form of the analogy developed by Lighthill (1952), and an acoustic analogy
derived by Powell (1964). All three predictions are in excellent agreement
with the simulation. Results of far-field pressure fluctuations from an
acoustically non-compact, co-rotating vortex pair are also presented. In
this case, the vortex sound theory over-predicts the sound by 65% in
accordance with the analysis of Yates (1978).
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
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