Mach number
From CFD-Wiki
(Difference between revisions)
| Line 1: | Line 1: | ||
| + | The Mach number, <math>M</math>, is the local flow-speed, <math>u</math>, divided by the local | ||
| + | speed of sound, <math>a</math>: | ||
| + | |||
| + | :<math>M \equiv \frac{u}{a} \equiv \frac{\mbox{local flow speed}}{\mbox{local speed of sound}}</math> | ||
| + | |||
| + | The Mach number can be used to categorise a compressible flows into different [[Mach number regimes]] | ||
| + | |||
| + | The name "Mach number" originates from the famous pioneer in compressible fluid dynamics [[Ernst Mach]] | ||
| + | |||
[[Category: Dimensionless parameters]] | [[Category: Dimensionless parameters]] | ||
Revision as of 10:31, 13 September 2005
The Mach number, 
, is the local flow-speed, 
, divided by the local
speed of sound, 
:
The Mach number can be used to categorise a compressible flows into different Mach number regimes
The name "Mach number" originates from the famous pioneer in compressible fluid dynamics Ernst Mach
