  The continuity equation requires that energy released in nuclear fusion flows
away from the point of interaction and is not immediately thermalised into the
CMB. It is seen that consequently the bulk of thermo-nuclear energy released in
BBN is converted by radiation pressure to kinetic energy of gas motions and
generates instability in homogeneous initial conditions. High levels of
turbulence follow, triggering the Jeans mechanism and leading to the formation
of galaxies and large-scale structure in the order of 10 Myrs. Friedmann
cosmology is perturbed, creating a fractal Voronoi matter distribution and
providing energy for reionisation. In keeping with observations, general
relativity predicts that there is no bound on the size of the structures
produced. The true (overall) rate of expansion is substantially below the
observed (local) value of Hubble's constant, and is consistent with published
estimates from the CMB for void models. The CMB is predicted to show near
flatness over the observed region. It is seen from observation of fluid flows,
from established physics, and from numerical solution of the Navier-Stokes
equations that bisymmetric spiral vortices form where gas flows meet. These
vortices necessarily have flat rotation curves at large radii and create
conditions for spiral galaxy formation. It is shown by N-body simulation that
enduring Sa, Sb and Sc spiral galaxies result from appropriate initial
conditions. The simulations and analysis of spiral potential show that orbital
velocities are greater than would be the case in an axisymmetric potential.
