CFD Online Logo CFD Online URL
Home > Wiki > Mach number

Mach number

From CFD-Wiki

Revision as of 10:31, 13 September 2005 by Jola (Talk | contribs)
Jump to: navigation, search

The Mach number, M, is the local flow-speed, u, divided by the local speed of sound, a:

M \equiv \frac{u}{a} \equiv \frac{\mbox{local flow speed}}{\mbox{local speed of sound}}

The Mach number can be used to categorise compressible flows into different Mach number regimes

The name "Mach number" originates from the famous pioneer in compressible fluid dynamics Ernst Mach

My wiki