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Mach number regimes

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Compressible flows are commonly divided into different regimes based on the free-stream Mach number according to the following table:

Flow regimeMach number range
Incompressible flow0.0 - 0.3
Subsonic flow0.3 - 0.8
Transonic flow0.8 - 1.2
Supersonic flow1.2 - 5.0
Hypersonic flow> 5.0
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