The Virtual National Airspace Simulation (VNAS) will improve the safety of Air Transportation. In 2001, using simulation and information management software running over a distributed network of super-computers, researchers at NASA Ames, Glenn, and Langley Research Centers developed a working prototype of a virtual airspace. This VNAS prototype modeled daily operations of the Atlanta airport by...

Fenestrated endovascular aneurysm repair is a minimally invasive method to treat abdominal aortic aneurysms. Stent grafts used in this process contain fenestrations that need to be aligned with the visceral arteries; however, fenestration misalignment (rotation) is a common occurrence and can result in severe complications. The objective of this work is to develop a finite element model of the ...

We describe the software architecture of a system for doing multiphysics simulation of a coupled fluid, thermal, and mechanical fracture problem. The system is organized as a collection of geographically-distributed software components in which each component provides a web service, and uses standard web-service protocols to interact with other components. The resulting system incorporates many...

The recent studies in the distributed simulation area are focused in the High Level Architecture, defined by the DoD/USA, which proposes a standard environment to develop and run distributed simulations. The HLA components are designed to ensure a high level of interoperability among simulations and, also, to allow maximum component reusability. This paper proposes a new mechanism to help optim...

This paper analyzes the process of merging groups of many Gaussian basis functions into a single basis function in vortex simulations. Analysis of the equations governing this process yields fundamental parameters and uniform estimates of the merger-induced error. In a merging event, the uniform error bound depends only on relationships between nearby computational elements permitting fast and ...

AS scientific simulation software becomes more complicated, the scientific-software implementer’s need for component tests from new model developers becomes more crucial. The community’s ability to follow the basic premise of the Scientific Method requires independently repeatable experiments, and model innovators are in the best position to create these test fixtures. Scientific software devel...

Electrical cell signaling requires adjustment of ion channel, receptor, or transporter function in response to changes in membrane potential. For the majority of such membrane proteins, the molecular details of voltage sensing remain insufficiently understood. Here, we present a molecular dynamics simulation-based method to determine the underlying charge movement across the membrane-the gating...

In this talk I would like to illustrate with examples taken from Quantum Field Theory and Biophysics how an intelligent exploitation of the unprecedented power of today's computers could led not only to the solution of pivotal problems in the theory of Strong Interactions, but also to the emergence of new lines of interdisciplinary research, while at the same time pushing the limits of modeling...

Experimental data often can only be interpreted by means of a computational simulation that approximately models the physical situation. We will discuss techniques that facilitate application to complex, large-scale simulations of the standard approach to inversion in which gradient-based optimization is used to nd the parameters that best match the data. The fundamental enabling techniques are...

Computational fluid dynamics (CFD) simulations of ship airwakes are discussed in this article. CFD is used to simulate the airwakes of landing helicopter assault (LHA) and landing platform dock-17 (LPD-17) classes of ships. The focus is on capturing the massively separated flow from sharp edges of blunt bodies, while ignoring the viscous effects. A parallel, finitevolume flow solver is used wit...