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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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Launch Ascent and Vehicle Aerodynamics (LAVA) (Computational Fluid Dynamics (CFD) solver) contribution to HiLiftPW-3 (3rd AIAA CFD High Lift Prediction Workshop). Including HL-CRM (NASA High Lift Common Research Model) and JSM (Joint Statistical Modeling) case studies.
Performance enhancements in NASA's recently developed Lattice Boltzmann solver within the Launch Ascent and Vehicle Aerodynamics (LAVA) framework are presented. Two key algorithmic developments are highlighted. A coarse-fine interface treatment that discretely conserves mass and momentum has been implemented and successfully verified and validated. Code optimizations targeting improved serial and parallel performance were presented. For a simple turbulent Taylor-Green Vortex problem, we were able to demonstrate a 2.3 times speedup over the baseline code for a single Skylake-SP node containing 40 physical cores, and a 2.14 times speedup for 64 nodes containing 2560 physical cores. In addition, we were able to show that the optimizations enabled us to scale the code almost perfectly to 20480 physical cores where, including ghost cells, the problem size was 10 billion cells.
In this paper we consider the infrared outbursts on Io reported over the last 15 years and examine the implications for resurfacing rates and heat flow using a recent, well observed, eruption sequence. A large change was observed in Io's infrared emission on January 9, 1990 at several different wavelengths. We model this event as due to a large actively erupting lava flow. The flow increased its area at a rate of 1.5 x 10 5 m 2 s -1 and cooled from 1225 K to 555 K over about 2.6 hours. This event is consistent with other Io infrared outbursts and is used in this paper to estimate the more general characteristics of Ionian volcanism, resurfacing, and heat flow. The inferred eruption rate of 3 x 10 5 m 3 s -1 is very high, but is not unprecedented on the Earth.
Thermal polymerizations of amino acids and production of formed microparticles on lava
Stable aerosol formation from vapor pressure of hot lava of volcanic eruptions, causing evaporation and condensation from gas phase
Apollo 11 lunar rock lavas and breccias, examining opaque minerals and olivine by reflection microscopy, electron probe and optical absorption measurements
New Mexico Bandera lava tube systems, noting similarities with lunar surface sinuous rilles
Bandera lava tubes of New Mexico and lunar comparisons
Investigating composition and ages of Icelandic lavas to determine validity of sea floor spreading
Analyzing subaerial flows of lava in eastern Iceland and recent and Pleistocene flows in neovolcanic zone of central Iceland for basalt composition
Investigating effects of lava outgassing on primary colonization by organisms
Characteristics of lava tubes and channels on lunar surface
Lava tube and channel development in basalt flow in upper east rift zone of Kilauea volcano, Hawaii
Geomorphology of basaltic lava tubes from Mount St. Helens, Washington
Manua Islands /Samoa/ lavas chemical composition, geology and probable history
The Apollo 15 metric camera photography provided a number of spectacular views of most of the southern and central portions of the unique systems of major lava flows that stretch diagonally across Mare Imbrium from the general area of Euler Crater to a point east of Le Verrier Crater. A preliminary examination of the photographs indicates that the source of the material comprising the major flows is situated to the west of Euler Crater and south of the limits of the photographic coverage. The photographs also show clearly that most, if not all, the mare ridges included were formed after the solidification of the flows. Few color boundaries exist in the area of metric photography where the illumination angle is low enough to show the fronts of some of the very thin flows. However, patches of redder material lying northeast of Mt. Lahire are found to be enclosed by low flow fronts, confirming the theory that the redder material represents an earlier filling of the Imbrium basin.
Discussion of a hypothesis according to which two separate phases of lunar crust heating could be responsible for the formation of Mare Smythii and Tsiolkovsky crater, two lava-filled relatively recent lunar features which cannot be easily explained by other hypotheses. A small-crater count in eight flat floored larger craters is conducted in an attempt to support the two-phase heating hypothesis, on a theory that the distribution of the smaller craters by size may indicate a recurrence of lunar crust heating. Further counts are suggested for a more substantiated conclusion.
A modified radiochemical neutron activation analysis was used to determine 24 elements in three sieve separates and in HCl leach, HF etch, and residue fractions of the 500-62 micron separate of orange glass fines 74220. Six elements - In, Cd, Zn, Ga, Ge, and Au - were strongly concentrated in the leach, indicating that they were present as a surface deposit, probably a sublimate resulting from condensation of lava-fountain volatiles which expelled the orange glass onto the lunar surface.