From:
John.Powell@f4.n1010.z9.FIDONET.ORG (John Powell)
Subject: AFOSR -
Projects
Date: 3 Nov 94 04:19:52 GMT
Organization: FidoNet node
9:1010/4 - ParaNet(sm) A, Cockeysville MD
EXTERNAL AERODYNAMICS AND
HYPERSONICS
_________________________________________________________________
PROGRAM DESCRIPTION:
External
Aerodynamics and Hypersonics
This research program seeks to improve
the understanding of
viscous and inviscid fluid flow phenomena that
strongly influence
the mission-requirements-driven design, aerodynamic
performance,
and efficiency of Air Force flight vehicles. This program
compris
es three technical thrust areas: advanced computational
fluid
dynamics (CFD), unsteady aerodynamics, and hypersonics.
Research
should focus on the underlying physical mechanisms that
govern
these classes of complex flows.
Research in advanced CFD
is sought to develop autoadaptive,
unstructured grid methods. Research is
ongoing to develop methods
capable of simulating the complex,
three-dimensional,
time-dependent flows created by aircraft and missile
platforms
during dynamic combat maneuvers. Research is also sought
to
address flows with multiple bodies in relative dynamic motion,
such
as store separation. These full Navier-Stokes simulations
include viscous
effects that range from laminar, through
transitional, to fully turbulent
boundary layer states. Of
particular importance is the development of
advanced LES and DNS
methods for high speed, viscous, compressible flows
over aircraft
and missile components (wings/fins and fuselages), as well
as
internal flows in supersonic engine inlets and hypersonic
SCRAMJET
inlet systems. LES methods using spectral element or
other DNS subgrid
scale simulations are of particular interest.
We are also interested in
developing analysis capabilities for
dynamic, three-dimensional, viscous,
hypersonic engine inlet
unstart processes.
Research in unsteady
aerodynamics should reveal the fundamental
viscous processes associated
with vorticity generation within the
boundary layer along wing leading
edges, the mechanisms
responsible for the transfer of that vorticity
through feeding
sheets from within the boundary layer into discrete
vortices
outside the boundary layer, and the convection of those
vortices
once they are shed from the boundary layer into the free
stream
flow around and beyond the wing. Research to identify the
influence
of wing leading-edge geometry and aircraft motion on
these processes is
also sought. It is critically important to
develop nondissipative CFD
algorithms that are capable of
tracking multiple shed vortices with no
diffusive loss of
vorticity. This includes phenomena related to vortex
convection,
vortex surface impingement, and multiple vortex coalescence.
Research
in hypersonics should improve the understanding of
complex,
time-dependent, three-dimensional viscous flows with and
without finite
rate chemistry effects and should advance the
accuracy of high-altitude
numerical simulation methods. We are
especially interested in
three-dimensional Burnett-equation
numerical methods. Boundary layer
stability and transition
analyses for flows over hypersonic flight
vehicles based on the
Burnett equations are of particular interest. Direct
numerical
simulation methods with rate chemistry are also sought. We
are
also interested in shock-tunnel research that investigates the
fundamental
fluid mechanics of high Reynolds number as well as
high-enthalpy
hypersonic flows at realistic flight conditions.
New concepts for
hypersonic, high-enthalpy, and high Reynolds
number shock tunnels are of
particular interest.
_________________________________________________________________
CONTACT
ADDRESS:
Name: Dr. Len
Sakell
Phone: (202)767-4935
Title: Program Manager
Office: AFOSR/NA
Address: Air Force Office of
Scientific Research
110
Duncan Avenue, Suite B115
Bolling AFB, DC 20332-0001
_________________________________________________________________
KEYWORDS:
Keycode
Keyword
34 Research
0601001
Aerodynamics
1015510 Fluid Flow
0601013 Computational Fluid
Dynamics
1015270 Boundary Layers
0601008 Turbulence
1010006
Geometry
0609014 Fluid Mechanics
_________________________________________________________________
comments@fedix.fie.com
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