This filter is found in
It distorts the image into a kind of sucking whirlpool as in a washbowl.
Changes to parameters are immediately displayed into the Preview. The whirlpool is focused around the current layer or selection center.
Whirl Angle: Clockwise or counter clockwise (-360 +360)
Pinch Amount: Whirlpool depth(-1 +1)
Radius: Whirlpool width (0.0-1.0). A negative value gives a whirlpoll coming toward you.