Derivation of viscous Schwarz scale L_SV:

If turbulence forces are negligible, then gravitational structure formation will begin when the viscous forces at scale L match the gravitational forces. The viscous forces F_V=rho nu gamma L^2 at scale L. The gravitational forces F_g = rho^2 L^4 G. The forces match at

L_SV = (gamma nu / rho G)^1/2.