River model of a charged (Reissner-Nordström) Black Hole

Same Gullstrand-Painlevé (1921) metric
 ds2  =  - dtff2 + (dr + b dtff)2 + r2 (dq2 + sin2q df2
with 
b  º  [ 2 G M(r) / r ]1/2 
, interior mass
M(r) = M - Q²/2r 

Space flowing into and out of a charged black hole with Charge/Mass = 0.9.


  River model: Kerr-Newman