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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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At least 775 records · Page 43
All sourcesNASA NTRSDOE OSTI
NASA NTRS2004

Nanoscale Bio-engineering Solutions for Space Exploration: The Nanopore Sequencer

Characterization of biological systems at the molecular level and extraction of essential information for nano-engineering design to guide the nano-fabrication of solid-state sensors and molecular identification devices is a computational challenge. The alpha hemolysin protein ion channel is used as a model system for structural analysis of nucleic acids like DNA. Applied voltage draws a DNA strand and surrounding ionic solution through the biological nanopore. The subunits in the DNA strand block ion flow by differing amounts. Atomistic scale simulations are employed using NASA supercomputers to study DNA translocation, with the aim to enhance single DNA subunit identification. Compared to protein channels, solid-state nanopores offer a better temporal control of the translocation of DNA and the possibility to easily tune its chemistry to increase the signal resolution. Potential applications for NASA missions, besides real-time genome sequencing include astronaut health, life detection and decoding of various genomes.

Stolc, Viktor↗
NASA NTRS2004

Advanced Aerospace Materials by Design

The advances in the emerging field of nanophase thermal and structural composite materials; materials with embedded sensors and actuators for morphing structures; light-weight composite materials for energy and power storage; and large surface area materials for in-situ resource generation and waste recycling, are expected to :revolutionize the capabilities of virtually every system comprising of future robotic and :human moon and mars exploration missions. A high-performance multiscale simulation platform, including the computational capabilities and resources of Columbia - the new supercomputer, is being developed to discover, validate, and prototype next generation (of such advanced materials. This exhibit will describe the porting and scaling of multiscale 'physics based core computer simulation codes for discovering and designing carbon nanotube-polymer composite materials for light-weight load bearing structural and 'thermal protection applications.

Srivastava, Deepak↗
NASA NTRS2004

Modeling of Radiation Risks for Human Space Missions

Prior to any human space flight, calculations of radiation risks are used to determine the acceptable scope of astronaut activity. Using the supercomputing facilities at NASA Ames Research Center, Ames researchers have determined the damage probabilities of DNA functional groups by space radiation. The data supercede those used in the current Monte Carlo model for risk assessment. One example is the reaction of DNA with hydroxyl radical produced by the interaction of highly energetic particles from space radiation with water molecules in the human body. This reaction is considered an important cause of DNA mutations, although its mechanism is not well understood.

Fletcher, Graham↗
NASA NTRS2005

Revitalizing HEC at NASA

This talk will review the focus on NASA advances in SSI supercomputing technology over the last 4 years, the development of the worlds largest Origins. the development of the cooperative program that developed the CRAY and SGI system in FY03 and the efforts that led to the formulation and approval of the NAS program and Columbia Project. Finally a projection of the RBD and operations focus in HEC for the next 3-5 years will be described. (use NAS url)

Brooks, Walt↗
NASA NTRS2005

Nanoscale Bioengineering Solutions for Space Exploration the Nanopore Sequencer

Characterization of biological systems at the molecular level and extraction of essential information for nano-engineering design to guide the nano-fabrication of solid-state sensors and molecular identification devices is a computational challenge. The alpha hemolysin protein ion channel is used as a model system for structural analysis of nucleic acids like DNA. Applied voltage draws a DNA strand and surrounding ionic solution through the biological nanopore. The subunits in the DNA strand block ion flow by differing amounts. Atomistic scale simulations are employed using NASA supercomputers to study DNA translocation. with the aim to enhance single DNA subunit identification. Compared to protein channels, solid-state nanopores offer a better temporal control of the translocation of DNA and the possibility to easily tune its chemistry to increase the signal resolution. Potential applications for NASA missions, besides real-time genome sequencing include astronaut health, life detection and decoding of various genomes. http://phenomrph.arc.nasa.gov/index.php

Ioana, Cozmuta↗
NASA NTRS2004

RTF Analysis-Shuttle Debris Transport

This demo will rewew the findings of the Shuttle's Debris Transport analysis. The demo focuses on aero analysis of the entlre vehicle in ascent (orbiter, SRB and ET together at low Mach number) for debris transoort and determining maximum allowable debris sizes from various sources. We will present analysis results along with performance data of the simulation runs on Supercomputers such as Columbia.

Aftosmis, Michael↗
NASA NTRS2004

RTF Analysis-Propulsion/Flowliner

The objective of the current task is to provide a computational framework for design and analysis of the entire fuel supply system of a liquid rocket engine, including high fidelity unsteady turbopump flow analysis. Time-accurate results obtained from shuttle fuel flowliner analysis using 66 Million grid points with 262 overlapped zones will be shown. We will present analysis results along with performance data of the simulation runs on Supercomputers such as Columbia.

Kiris, Centin↗
NASA NTRS2005

Computer Simulation Performed for Columbia Project Cooling System

This demo shows a high-fidelity simulation of the air flow in the main computer room housing the Columbia (10,024 intel titanium processors) system. The simulation asseses the performance of the cooling system and identified deficiencies, and recommended modifications to eliminate them. It used two in house software packages on NAS supercomputers: Chimera Grid tools to generate a geometric model of the computer room, OVERFLOW-2 code for fluid and thermal simulation. This state-of-the-art technology can be easily extended to provide a general capability for air flow analyses on any modern computer room. Columbia_CFD_black.tiff

Ahmad, Jasim↗
NASA NTRS2003

Alloy Design Workbench-Surface Modeling Package Developed

NASA Glenn Research Center's Computational Materials Group has integrated a graphical user interface with in-house-developed surface modeling capabilities, with the goal of using computationally efficient atomistic simulations to aid the development of advanced aerospace materials, through the modeling of alloy surfaces, surface alloys, and segregation. The software is also ideal for modeling nanomaterials, since surface and interfacial effects can dominate material behavior and properties at this level. Through the combination of an accurate atomistic surface modeling methodology and an efficient computational engine, it is now possible to directly model these types of surface phenomenon and metallic nanostructures without a supercomputer. Fulfilling a High Operating Temperature Propulsion Components (HOTPC) project level-I milestone, a graphical user interface was created for a suite of quantum approximate atomistic materials modeling Fortran programs developed at Glenn. The resulting "Alloy Design Workbench-Surface Modeling Package" (ADW-SMP) is the combination of proven quantum approximate Bozzolo-Ferrante-Smith (BFS) algorithms (refs. 1 and 2) with a productivity-enhancing graphical front end. Written in the portable, platform independent Java programming language, the graphical user interface calls on extensively tested Fortran programs running in the background for the detailed computational tasks. Designed to run on desktop computers, the package has been deployed on PC, Mac, and SGI computer systems. The graphical user interface integrates two modes of computational materials exploration. One mode uses Monte Carlo simulations to determine lowest energy equilibrium configurations. The second approach is an interactive "what if" comparison of atomic configuration energies, designed to provide real-time insight into the underlying drivers of alloying processes.

Abel, Phillip B.↗
NASA NTRS2005

10 Gigabit Ethernet Performance on SGI Altix and Origin Systems

As the state of high performance computing continues to advance, the size of datasets continue to grow, driving a need for high bandwidth data networks. family of networks. 10 Gigabit Ethernet is the latest step in the popular Ethernet We have evaluated the S2io Xframe 10 Gigabit Ethernet adapter on 512p SGI Altix systems running ProPack 3, and Origin systems running Irix 6.5.24 and 6.5.26 in our production supercomputing environment. We encountered a number of performance and stability issues, which were promptly dealt with by SGI and S2io. Using nttcp we tested TCP performance for single and multiple streams, and we tested file transfer using NFS and bbftp. We will present the results of our testing, including the effects of various tuning options on throughput and CPU utilization, and offer suggestions for configuring and tuning S2io 10 Gigabit Ethernet cards in an Altix/Linux or Origin/Irix environment.

Meyer, Andy↗
NASA NTRS2005

Building Columbia from the System Administrator View

This document is about NASA advanced supercomputing by building Columbia through the configuration of its software, hardware, and network. The content also includes future plans which include tight scheduling, maintaining production while building Columbia and continued production work while reworking the facilities to acommodate Columbia.

Chan, Davin↗
NASA NTRS2005

Building Columbia from the SysAdmin View

Project Columbia was built at NASA Ames Research Center in partnership with SGI and Intel. Columbia consists of 20 512 processor Altix machines with 440TB of storage and achieved 51.87 TeraPlops to be ranked the second fastest on the top 500 at SuperComputing 2004. Columbia was delivered, installed and put into production in 3 months. On average, a new Columbia node was brought into production in less than a week. Columbia's configuration, installation, and future plans will be discussed.

Chan, David↗
NASA NTRS2000

Large-scale visualization of digital sky surveys

Designed and developed within JPL/Caltech's supercomputing and visualization environment, the virtual observatory software described in this paper permits high performance visualization and analysis of large sky images and catalogs.

sky survey↗
NASA NTRS1997

3-D Deformable Grid Electomagnetic PIC for Parallel Computers

We have developed a three-dimensional non-orthogonal grid electromagnetic PIC code for parallel supercomputers. The numerical formulation is based on hexahedral cells which are logically connected cubic cells but distorted to body-fit complex geometries in physical space. An outstanding area of research is to improve the accuracy of the electromagnetic field solve on distorted meshes.

3D deformable non-orthogonal grid code PIC codes p↗