Reply To: Setting a rotating boundary in fluent (2D)

[raul.raghav]

For 2D Planar simulations, your geometry exists in the XY plane and the Z-axis is oriented out of the computer screen (see image below)

If you use the right-hand thumb rule, you'll find that, counter-clockwise (CCW) rotation is +ve and clockwise (CW) rotation is -ve. And if you're monitoring the coefficient of lift (C_l), you'd have a negative C_l value for CCW rotation and a positive C_l value for CW rotation.

So we have,

CCW wall rotation --> (+ve w) --> (-ve C_l)

CW wall rotation --> (-ve w) --> (+ve C_l)