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NASA Technical Reports Server (NTRS) 20110016811: Part 1 of a Compu...
by NASA Technical Reports Server (NTRS)
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This first of three reports on a computational study of a
drop-laden temporal mixing layer presents the results of
direct numerical simulations (DNS) of well-resolved flow
fields and the derivation of the large-eddy simulation
(LES) equations that would govern the larger scales of a
turbulent flow field. The mixing layer consisted of two
counterflowing gas streams, one of which was initially
laden with evaporating liquid drops. The gas phase was
composed of two perfect gas species, the carrier gas and
the vapor emanating from the drops, and was computed in
an Eulerian reference frame, whereas each drop was
tracked individually in a Lagrangian manner. The flow
perturbations that were initially imposed on the layer
caused mixing and eventual transition to turbulence. The
DNS database obtained included transitional states for
layers with various liquid mass loadings. For the DNS,
the gas-phase equations were the compressible Navier-
Stokes equations for conservation of momentum and
additional conservation equations for total energy and
species mass. These equations included source terms
representing the effect of the drops on the mass,
momentum, and energy of the gas phase. From the DNS
equations, the expression for the irreversible entropy
production (dissipation) was derived and used to
determine the dissipation due to the source terms. The
LES equations were derived by spatially filtering the DNS
set and the magnitudes of the terms were computed at
transitional states, leading to a hierarchy of terms to
guide simplification of the LES equations. It was
concluded that effort should be devoted to the accurate
modeling of both the subgridscale fluxes and the filtered
source terms, which were the dominant unclosed terms
appearing in the LES equations.
Date Published: 2016-10-23 07:48:56
Identifier: NASA_NTRS_Archive_20110016811
Item Size: 1629415
Language: english
Media Type: texts
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