NASA Supercomputer Simulations Reveal 'Noisy' Aerodynamics

Simulation allows NASA researchers to better understand and predict the changes that contribute to aircraft noise.
Posted in: News, Aeronautics, Aerospace, Aviation, Mathematical/Scientific Software, Simulation Software, Software
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Desktop Status

The purpose of the Desktop Status application is to collect processor, memory, and storage usages of a computer running the Microsoft Windows 7 operating system, and record these data with time stamps to files at a user-defined time interval. A graphical user interface (GUI) captures users' inputs and displays them on a plot for informational purposes. Microsoft Windows' Task Manager program, a prior art that is included in the Windows operating system, has the capability to collect processor and memory usages and display them on a graph, but cannot write the raw data values to files with time stamps at regular time intervals.

Posted in: Briefs, Software, Computer software / hardware, Computer software and hardware, Computer software / hardware, Computer software and hardware, Human machine interface (HMI), Displays, Displays
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ScienceOrganizer: A Scientific Knowledge Management and Remote Experimentation Tool

The ScienceOrganizer system was designed to facilitate the work of geographically distributed NASA science teams by supporting the organization, administration, documentation, and execution of science projects and missions. The capabilities of ScienceOrganizer include the ability to conduct and monitor working experiments; locate, utilize, and publish experimental datasets; develop and share scientific software models; store scientific project information; document the scientific process; and co-visualize scientific data. Users access ScienceOrganizer through an intuitive Web-based interface that enables them to upload, download, and centrally organize project information including data, documents, images, and scientific records associated with laboratory and field experiments.

Posted in: Briefs, Software, Big data, Internet, Big data, Internet, Data management, Test equipment and instrumentation
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Knowledge Preservation Management

The Knowledge Preservation Management (KPM) system allows for the capture, management, and Web-based access of manufacturing operations information. KPM also captures retirees' knowledge via transcript-enabled video-taped interviews, and with video data-mining advanced search capabilities. Access to this information is available directly to the operator on the factory floor or in an office, providing a complete, on-demand knowledge management and training capability.

Posted in: Briefs, Software, Big data, Internet, Big data, Internet, Education, Education and training, Manufacturing equipment and machinery, Manufacturing processes
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Development of Automated Structural Health Monitoring for Composite Overwrapped Pressure Vessels

Virtually all NASA spacecraft use composite overwrapped pressure vessels (COPVs) to reduce the weight disadvantage of metal pressure vessels. However, these composite structures are more susceptible to damage than metal PVs, are difficult to inspect, have large burst pressure variability, and are susceptible to stress rupture when maintained at pressure. Over the past few years, NASA's Johnson Space Center (JSC) White Sands Test Facility (WSTF) has developed novel analysis methods that show promise for assessing the structural health of composite overwrapped pressure vessels. These methods and industry standard methods have been integrated into specialized software for automated analysis, thus significantly increasing throughput to the point where real-time assessments of structural health may be determined. Adaptive analysis methods have also been developed to provide modal analyses at specified points in a structure's life, including loading, unloading, and dwells. Together, these enhancements increase the utility and ease of use for acoustic emission testing.

Posted in: Briefs, Software, CAD / CAM / CAE, CAD, CAM, and CAE, Vehicle health management, Composite materials, Spacecraft
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Sound-Off: How to Model Electric Bus Implementation

To reduce costs and eliminate air pollution, many cities are exploring the benefits of electric buses. Before electrified fleets take the road, however, officials will require a test run. The National Research Council of Canada (NRC) used a modeling approach.

Posted in: News, Electronic Design Automation (EDA), Simulation Software, Software
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MSET Industrial Early Warning System

System breakdowns in modern industrial environments can result in millions of dollars in lost time and productivity, and even the loss of life and property. In the utilities industry — where the continuous operation of coolant pumps is essential — the breakdown of a single pump can result in a loss of as much as $10 million in downtime.

Posted in: Briefs, Software
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Robust Mesh Update Method for Grid Motion Problems

Over the past several decades, one class of problems in computational fluid dynamics (CFD) that has undergone substantial development involves movement of the fluid domain boundary. The problem class exists when the fluid domain boundary is either explicitly time-dependent, or is known a priori and determined as part of a flow solution in a coupled fashion. Free-surface fluid-structure interaction and forced-motion flows are typical of problems in this class. More specifically, as a boundary moves, a CFD mesh simulating the fluid dynamics can experience mesh cell distortion to the point of cell collapse, thereby rendering the CFD mesh meaningless.

Posted in: Briefs, Software
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An Upwind Parabolized Navier-Stokes Solver (UPS) for Supersonic and Hypersonic Flow Simulation, Version 6.1

The simulation of high-speed flow involves unique challenges such as the treatment of strong flow gradients associated with shock waves and expansion fans, as well as the modeling, at hypersonic speeds, of air chemistry effects. However, supersonic flow also produces the effect of limited zones of influence, which allows for single-sweep flow solution processes. The parabolized Navier-Stokes (PNS) equations are a modification of the equations of fluid flow that extend this inherently supersonic property into the subsonic portion of the boundary layer in viscous flows. Solution methods for systems that are hyperbolic/parabolic in a spatial direction can be obtained using a space-marching approach that can be an order of magnitude faster than using a time-marching method on the time-dependent Navier-Stokes equations.

Posted in: Briefs, Software
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Efficient Two-Dimensional Solution Methods for the Navier-Stokes Equations

ARC2D is a computational fluid dynamics (CFD) program for two-dimensional airfoil and simply connected geometries. The program uses implicit finite-difference techniques to solve two-dimensional Euler equations and Navier-Stokes equations. It is based on the Beam and Warning implicit approximate factorization algorithm in generalized coordinates, in a variety of block or diagonal forms. The methods are either time-accurate (e.g., dual-time-stepping or Runge-Kutta methods) or accelerated non-time-accurate steady-state schemes. The evolution of the solution through time is physically realistic; good solution accuracy is dependent on mesh spacing and boundary conditions.

Posted in: Briefs, Software
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