Software of the Year

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2001 Award Co-Winners

Award Title:

Numerical Propulsion System Simulation (NPSS)

Lead NASA Center:

Glenn Research Center (GRC)

Case Number:

LEW-17051-1

Summary:

The Numerical Propulsion System Simulation (NPSS) Version 1 is the first major aerospace design and analysis tool designed and written in the object-oriented (OO) programming paradigm to improve engineering productivity. NPSS' new OO software architecture enables multi-fidelity analysis in the design environment and facilitates integration of multiple disciplines. At its foundation, NPSS is a component-based OO engine cycle simulator designed to perform steady state and transient performance predictions, test data reduction, and many other traditional tasks of engine cycle simulation codes. An NPSS engine model is assembled from a collection of interconnected components and controlled through the implementation of an appropriate solution algorithm. Historically, limited computer resources restricted component representations used in these simulations to be simple characterizations of empirical test results, or the results of more sophisticated component models run separately. NPSS, however, is capable of calling upon more sophisticated component models directly. Using the computer industry's communication standard Common Object Request Broker Architecture (CORBA), NPSS can interact with external codes running on other computers distributed across a network. NPSS will allow the seamless integration of design tools at varying levels of dimensional fidelity across multiple technology disciplines. The NPSS term zooming originated in the conceptual phase of NPSS. Zooming is the coupling of analyses at various levels of detail. In March 2000, NPSS Version 1 was distributed to NASA, Department of Defense (DOD) and the US aircraft industry. NPSS is considered a world-class propulsion system simulation tool that provides the user with unprecedented capability and ease of use. Using NPSS, the General Electric Aircraft Engines (GEAE) Company estimates a 55% reduction in engine analysis time throughout the product life cycle. This is based on a documented detailed assessment by GEAE. Other industry partners predict similar savings. NPSS offers key technological advances to increasing US aerospace industry competitiveness. As such, NPSS is an emerging US standard for aerospace simulations.


Award Title:

Generalized Fluid System Simulation Program (GFSSP)

Lead NASA Center:

Marshall Space Flight Center (MSFC)

Case Number:

MFS-31303-1

Summary:

This is a software package developed for analyzing complex internal fluid flows with multiple gas and liqid mixtures. It is extremely limited to one dimensional flows, but uses linear techniques isolating flow properties at discrete nodes and branches in a network to simulate complex geometries. It uses a new technique of combining a Newton Raphson method with a successive substitution method to achieve solution stability and closure. GFSSP is in use for many NASA programs and projects, and fully documented in six conference papers.