Unsteady Suction

  Impulsively started flow at a=2. Times shown are t=0.5, 1, 2, 4, 8, 16, and 32 (nondimensionalized with the nose radius.) The nondimensional wall shear P is kept above 0.2:

Wall shear:

Suction velocity:

It is seen that for transient problems, much spikier suction distributions suffice initially.

Suction volume:

It is seen that transient suction volumes can be much smaller.

For scaled angle of attack a=4:

Wall shear:

Suction velocity:

Suction volume:

10/16/01 0:37:08 10/16/01 0:38:17