  The fluid physics of the heat and mass transfer from an object in its wake
has much importance for natural phenomena as well as for many engineering
applications. Here, we report numerical results on the population density of
the spatial distribution of fluid velocity, pressure, scalar concentration and
scalar fluxes of a wake flow past a sphere in the steady wake regime (Reynolds
number 25 to 285). We find the population density to be well described by a
Lorentzian distribution. We observe this apparently universal form both in the
symmetric wake regime and in the more complex three dimensional wake structure
of the steady oblique regime with Reynolds number larger than 225. The
population density distribution identifies the increase in dimensionless
kinetic energy and scalar fluxes with the increase in Reynolds number, whereas
the dimensionless scalar population density shows negligible variation with the
Reynolds number.
