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FREESTREAM - Freestream conditions
FREESTREAM {STATIC | TOTAL} [CONDITIONS] M P T alpha beta
|
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
|
|
| alpha, beta |
| Angles of attack and yaw (degrees)
|
Note that, if U is the freestream velocity magnitude, alpha and beta
are related to the Cartesian velocity components by:
w = U sin (beta)
u = U cos (beta) cos (alpha)
v = U cos (beta) sin (alpha)
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 beta is not equal to 0, locbeta is not equal to beta.
Note: WIND assumes alpha is rotation about the z axis.
That is, y is up.