p Fluid pressure 



p Pressure in a moving system 



P* Associated Leeendre function 



q Fluid velocity 



q Fluid velocity relative to the origin of a moving system 



q Fluid velocity in the undisturbed stream 



Position vector 



Position vector of the origin of a moving system 

 Position vector of a point referred to a moving system 

 Position vector of the centroid of the body 

 Position vector of the singularity (i) 



R Distance from the point fr^J 



R . Radius of the sphere S^ 



R Position vector of a point referred to (r^) 



R Position vector of moving singularity referred to (r^) 



S Surface of the body 



S', S' Control surfaces surrounding the system of singularities 



S- Sphere with center at (r^) 



Sa, Sx Unit vectors in polar coordinate system 



t Time 



V Velocity of the origin of a moving coordinate system 



V Velocity of a point fixed in the body 



V- Velocity of moving singularity relative to the body 



V Space occupied by the body 



7', 7' Space between S and S'and S" respectively 



F, Space within S'and exterior to iS' 



