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JPL Unified Methodology Process (JUMP)

This is a unique rapid development framework, complete with checklists, schedules, and supporting procedures. NASA’s Jet Propulsion Laboratory, Pasadena, California JPL Unified Methodology Process (JUMP) is an effort to establish a common frame of reference across OCIO (Office of Chief Information Officer) and EBIS (Enterprise Business Information Services Division). The iterative approach to project management is more powerful and efficient, enables better reviews, and incurs lower overhead costs. JUMP is a tailored version of rational unified process (RUP) and the iterative process. This process is flexible, scalable, and manageable.

Posted in: Briefs, TSP, Electronics & Computers

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Automated Evaluation Software (AES) Web Application

Goddard Space Flight Center, Greenbelt, Maryland The Automated Evaluation Software Web application was created using Java Enterprise technologies, which provided capabilities for dynamic report generation and Microsoft output. The Tomcat Application server makes the application robust, fast, and reliable. HTML 4.0 was used to create the user interface, making it compatible with both Internet Explorer and Firefox. The application takes advantage of the Jakarta Struts framework, making a proper Model View Controller design. The Struts framework provides the ability to change the navigation and presentation without changing the underlying data model, and vice versa.

Posted in: Briefs, Electronics & Computers

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A RESTful Web Service Connector for Phoenix Analysis Server

The Web service connects front-end user interfaces to the back-end analysis executions. NASA’s Jet Propulsion Laboratory, Pasadena, California Engineering design models are normally developed using specific modeling tools such as Excel, Matlab, Maple, and Mathematica. It is difficult to connect various models written in different modeling environments and produce results without extensive effort. Phoenix ModelCenter is a commercial tool that can perform this kind of operation on a single desktop computer via a graphical user interface.

Posted in: Briefs, TSP, Electronics & Computers

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Predictive Computations of Single-Phase Turbulent Flows

Explicitly filtered large-eddy simulation is used. NASA’s Jet Propulsion Laboratory, Pasadena, California This software computes a single-phase turbulent flow. The solution is independent of the grid spacing on which it is computed, and on the discretization order used for the differential equations. Grid spacing and discretization-order independence can be achieved by reformulating the large-eddy simulation (LES) equations. Previous software followed the conventional LES equations, whereas the present one follows the explicitly filtered formulation (EFLES).

Posted in: Briefs, Simulation Software

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Predictive Computation of Two-Phase Turbulent Flows with Phase Change

Explicitly filtered large-eddy simulation is used. This software computes two-phase turbulent flows with phase change, and the solution is independent of the grid spacing on which it is computed and on the discretization order used for the differential equations. Grid spacing and discretization-order independence can be achieved by reformulating the large-eddy simulation (LES) equations. Previous software followed the conventional LES equations, whereas the present one follows the explicitly filtered formulation (EFLES).

Posted in: Briefs, Simulation Software

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Physics-Model-Based Wiring Fault Detection Toolbox for MATLAB

Ames Research Center, Moffett Field, California This software provides a toolbox of MATLAB functions for detecting precursor wiring faults, such as chafing, in shielded impedance-controlled cable using measurements from off-the-shelf time domain reflectometry or vector network analyzer hardware. It advances the state-of-the-art in wiring fault detection, currently limited to the detection of hard opens or shorts, by combining high-fidelity analytical physics models for signal propagation on faulty cable with fast Bayesian inference algorithms for intrinsic cable and fault parameter retrieval. The overall approach is robust to noisy operating conditions, and does not require fixed baseline measurements. More information about this software can be found at: http://ti.arc.nasa.gov/project/wiring.

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PEGASUS 5.2: Automated Pre-Processing of Overset CFD Grids

Ames Research Center, Moffett Field, California The Pegasus software is used as a pre-processor for overset-grid computational fluid dynamic (CFD) simulations. The main features of the software include: automated hole cutting algorithms; a projection scheme for fixing small discretization errors in overset surfaces; efficient interpolation search methods; hole-size optimization based on adding additional layers of fringe points; and an automatic restart capability. The code can be run in parallel using the Message-Passing Interface standard. The parallelization performance provides efficient speed-up of the execution time capable of utilizing dozens or even hundreds of processors.

Posted in: Briefs, Simulation Software

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