  We study the swarming behavior of hydrodynamic alignment. Alignment reflects
steering towards a weighted average heading. We consider the class of so-called
$p$-alignment hydrodynamics, based on $2p$-Laplacians, and weighted by a
general family of symmetric communication kernels. The main new aspect here is
the long time emergence behavior for a general class of pressure tensors
without a closure assumption, beyond the mere requirement that they form an
energy dissipative process. We refer to such pressure laws as `entropic', and
prove the flocking of $p$-alignment hydrodynamics, driven by singular kernels
with general class of entropic pressure tensors. These results indicate the
rigidity of alignment in driving long-time flocking behavior despite the lack
of thermodynamic closure.
