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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
--
John Powell - via ParaNet node 1:104/422
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INTERNET: John.Powell@f4.n1010.z9.FIDONET.ORG
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