圧縮性ジェットのシミュレーションからの発生音の推測 [in Japanese]
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A spatially evolving shear layer of axisymmetric compressible jet has been studied by accurate numerical simulations, where the fourth order upwind scheme is used to reduce numerical dissipation. Mach numbers simulated are 0.5, 0.8, 1.0 and 1.5, and the Reynolds number is 10<SUP>5</SUP>. At M=0.5 the effect of compressiblity is not remarkable and the flow has almost the same features as incompressible jet. However at M=1.5 the structure of vortex is rather different, where the shock waves are generated around vortex rings and the pressue waves are emitted in the direction with some angle from downstrea jet axis, which might seem to represent or lead to acoustic wave. This pattern was clearly captured by systematically increasing the number of grid points.
- Transactions of Visualization Society of Japan
Transactions of Visualization Society of Japan 17, 103-106, 1997-07-01
The Visualization Society of Japan