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 UUCP: !scicom!paranet!User_Name INTERNET: John.Powell@f4.n1010.z9.FIDONET.ORG ====================================================================== Inquiries regarding ParaNet, or mail directed to Michael Corbin, should be sent to: mcorbin@paranet.org. Or you can phone voice at 303-429-2654/ Michael Corbin Director ParaNet Information Services