// Last edited on 2012-09-29 05:39:31 by stolfilocal
// Rigid-body rotational flow


#local R = 0.69;      // Radius of the pathline that goes through the origin.
#local V00 = 0.8;     // Linear velocity at origin.

// We cannot guarantee that the motion of particles will close at the top of the orbit.
// Thus the radius {R} must be large enough so that no pathline is closed.

#declare flow_crv = 1/R;
#declare flow_A = 0;
#declare flow_B = V00;
#declare flow_C = -flow_B/R;
#declare flow_D = 0;

#declare flow_mag = 0.048;
#declare flow_diff_mag = 0.040; // Mag factor for differential velocities.