Wind-US User's Guide - Keyword Reference, FREESTREAM

(Wind-US Documentation Home Page) (Wind-US User's Guide) (GMAN User's Guide) (MADCAP User's Guide) (CFPOST User's Guide) (Wind-US Utilities) (Common File User's Guide) (Wind-US Installation Guide) (Wind-US Developer's Reference) (Guidelines Documents)

(Introduction) (Tutorial) (Geometry and Flow Physics Modeling) (Numerical Modeling) (Boundary Conditions) (Convergence Monitoring) (Files) (Scripts) (Parallel Processing) (Keyword Reference) (Test Options)

FREESTREAM - Freestream conditions

FREESTREAM {STATIC | TOTAL} [CONDITIONS] M P T α β

This keyword allows input of freestream flow conditions. The user-specified parameters are defined as:

M Mach number
P Static or total pressure (psi), depending on the STATIC | TOTAL keyword
T Static or total temperature (°R), depending on the STATIC | TOTAL keyword
α, β Angles of attack and yaw (degrees)

Note that, if U is the freestream velocity magnitude, α and β are related to the Cartesian velocity components by:

w = U sin β
u = U cos β cos α
v = U cos β sin α

Note: The local flow angles (localpha and locbeta in the CFPOST post-processing package) are defined relative to the x,y,z coordinates and are given by:

localpha = tan⁻¹ (v/u)
locbeta = tan⁻¹ (w/u)

Thus if β is not equal to 0, locbeta is not equal to β.

Note: Wind-US assumes α is rotation about the z axis. That is, y is up.

See Also: INITIALIZE, REINITIALIZE

	M		Mach number
	P		Static or total pressure (psi), depending on the `STATIC \| TOTAL` keyword
	T		Static or total temperature (°R), depending on the `STATIC \| TOTAL` keyword
	α, β		Angles of attack and yaw (degrees)