how to apply variable pressure on a curved surface

There is no easy way to do it. In fact, scripting left aside, you can't.

see the attachment.....

Hi,

make a cylindrical system with z is axis of bearing and type in pressure magnitude as equation 'cos(y)'

(switch magnitude to equation)

if it  is not your desire, try cos(x). this depend on axis of cylindrical system

before make pressure, you need assign nodes to cylindrical system