Question

Why center of pressure is below the center of gravity fluid mechanics?

Answer 1

Centre of pressure is the point at which the resultant force of buoyancy acts, while centre of gravity .Centre of pressure of a body immersed in a fluid depends on the physical dimensions of The body,(i.e.. the shape and the volume displaced by the body). it is the point at which the resultant gravitational acts.(actually at these points the force doesn't acts alone ,but we choose a such point where the effective force can be assumed)

So it's dependent on the body you take, that whether the Centre of Pressure will lie ABOVE or BELOW the centre of gravity.