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Detonation shock dynamics and comparisons with direct numerical simulation

Summary: Detonation shock dynamics and comparisons
with direct numerical simulation
Tariq D. Aslam
, and D. Scott Stewart
August 17, 1998
Comparisons between direct numerical simulation (DNS) of deto-
nation and detonation shock dynamics (DSD) is made. The theory of
DSD defines the motion of the detonation shock in terms of intrinsic
geometry of the shock surface, in particular for condensed phase ex-
plosives the shock normal velocity, Dn, the normal acceleration, Dn,
and the total curvature, . In particular, the properties of three in-
trinsic front evolution laws are studied and compared. These are 1)
Constant speed detonation (Huygens' construction), 2) Curvature de-
pendent speed propagation (Dn - relation), and 3) Curvature and
speed dependent acceleration ( Dn - Dn - relation). We show that
it is possible to measure shock dynamics directly from simulation of
the reactive Euler equations and that subsequent numerical solution
of the intrinsic partial differential equation for the shock motion (e.g.
a Dn - Dn - relation) reproduces the computed shock motion with


Source: Aslam, Tariq - Los Alamos National Laboratory


Collections: Physics