|DOWNSTREAM MACH [NUMBER] value [ZONE] range1[,range2[, ... rangen]]|
This keyword allows the specification of a mass-averaged subsonic Mach number value at outflow boundaries in structured grids. Based on the specified mass-averaged Mach number, and using the computed local Mach number and total pressure, a new local static pressure is computed. This boundary condition simulates the uniform Mach number characteristics observed at the compressor faces of turbine engines, and is identical in its effect on the flow to the COMPRESSOR FACE CHUNG keyword.
In the zone specification, the range parameter(s) must be one of the following forms:
|zonenum||Selects zone zonenum|
|begzone:endzone||Selects all zones from begzone to endzone|
|ALL||Selects all zones|
See Also: COMPRESSOR FACE, DOWNSTREAM PRESSURE, MASS FLOW, TEST 123