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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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This award resulted in a better characterization of shallow convection in the marine boundary layer during cold-air outbreaks. This was done through an examination of the coupling between marine boundary layer circulations that control cloud organization and cloud microphysical processes.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
Microstructural effects become important at regions of stress concentrators such as notches, cracks and contact surfaces. A multiscale model is presented that efficiently captures microstructural details at such critical regions. The approach is based on a multiresolution mesh that includes an explicit microstructure representation at critical regions where stresses are localized. At regions farther away from the stress concentration, a reduced order model that statistically captures the effect of the microstructure is employed. The statistical model is based on a finite element representation of the orientation distribution function (ODF). As an illustrative example, we have applied the multiscaling method to compute the stress intensity factor K I around the crack tip in a wedge-opening load specimen. The approach is verified with an analytical solution within linear elasticity approximation and is then extended to allow modeling of microstructural effects on crack tip plasticity.
Pressure distribution on x-15 aircraft model
Wind tunnel tests of static stability of model x-1e aircraft at mach 2 to 4
Supersonic wind tunnel testing - scout vehicle fin load and tip control hinge moments
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Resonant frequencies, mode shapes, and vibrational damping characteristics of Saturn S- I stage model
Fighter aircraft external stores ejection at transonic and supersonic speeds
Cold flow test of pump drive turbines for M-1 rocket engine
Release and flight characteristics study for externally carried fuel tank models of various configurations at subsonic and supersonic speeds
Vertical tail size and ventral fin effects on lateral and directional stability of VTOL AIRCRAFT at transonic speeds
Aerodynamic characteristics in pitch of horizontal attitude VTOL aircraft, including effects of negative dihedral horizontal tail
Shock wave interference and degradation in wind tunnel caused by protruding teeth, recessions, local expansions, and combinations of these
Hypersonic static stability investigation of Tomahawk rocket model
Flow conditions in inlet manifold of M-1 fuel pump drive turbine investigated using circumferential static pressure measurements in conjunction with smoke trace photographs