Lockheed Martin Skunk Works, under a cooperative agreement with NASA, will build and fly the X-33, a half-scale prototype of a rocket-based, single-stage-to-orbit (SSTO), reusable launch vehicle (RLV). A 0.007-scale model of the X-33 604B0002G configuration was tested in four hypersonic facilities at the NASA Langley Research Center to examine vehicle stability and control characteristics and t...

Launch vehicle design is a multidisciplinary process involving different disciplines such as aerodynamics, structure, propulsion and trajectory. This latter key discipline in the it used to assess overall performance of by solving an optimal control problem system nonlinear ordinary differential equations. Usual Multidisciplinary Design Optimization methods for launch consider trajectory auxili...

The low Reynolds number aerodynamics is important to investigate for micro air vehicle applications. current paper covers numerical simulations present the downstream development of wake patterns and detailed analysis vortices generated at NACA 0012 airfoil around critical angle attack where instantaneous vortex are oscillatory differ from mean pattern numbers ranging 1000 4000. aerodynamic for...

The Unsteady Vortex-Lattice Method provides a medium-fidelity tool for the prediction of non-stationary aerodynamic loads in low-speed, but high-Reynolds-number, attached flow conditions. Despite a proven track record in applications where free-wake modelling is critical, other less-computationally-expensive potential-flow models, such as the Doublet-Lattice Method and strip theory, have long b...

One contribution of 13 to a Theme Issue 'Aerodynamics, computers and the environment' .

2. Aerodynamic Simulation This paper reviews some of the progress in computational aerodynamics over the last decade and describes what remains to be done in the years ahead. The discussion includes a description of the Numerical Aerodynamic Simulation Program objectives, computational goals, and implementation plans.

I t seems not long ago that invasive coronary angiography was considered as the undisputed diagnostic standard and management determining test for patients with ischemic heart disease. Registry data have shown that reliance on noninvasive testing for myocardial ischemia, positioned as a gatekeeper to restrict referral to the catheterization laboratory, is far from optimal in clinical practice. ...

Federal Lab. for Materials Testing and Research (Empa) Dübendorf Switzerland l 5 Bakala Academy Athletic Performance Center Univ. of Leuven Heverlee, Belgium Surprises in cycling aerodynamics T he greatest potential for improvement in cycling speed is aerodynamic” [1]. At racing speeds (about 54 km/h or 15 m/s in time trails), the aerodynamic resistance or drag is about 90% of the total resista...