Charles Justiz - Academia.edu (original) (raw)

Papers by Charles Justiz

Day 4 Thu, May 05, 2022

This paper presents a different and more proactive approach to safety innovation based on work do... more This paper presents a different and more proactive approach to safety innovation based on work done in support of General Aviation (GA) safety improvement. The approach is highly transferable to other industries and environments and delivers systematic means to proactively evaluate and manage both safety innovations and the rate of creation of safety innovations to improve safety performance. Theoretical root cause models of two of the leading causes of general aviation fatalities were developed by a team of highly experienced aviation and industry experts. This approach was novel in that the selection of these two "classes of accidents" was proactive, based on historical data for the major causes of fatalities. The models therefore represent a complete and theoretical picture of fatalities causes, rather than being based on specific investigations that address individual incidents as is the norm in our industry. This approach led to several surprising and valuable finding...

Vacuum and flow field results from the wake shield facility flight experiment. [AIP Conference Pr... more Vacuum and flow field results from the wake shield facility flight experiment. [AIP Conference Proceedings 325, 323 (1995)]. Mona Desai, Rebecca Forrest, Charles Horton, Alex Ignatiev, Mark Sterling, John Strozier, Charles Justiz, Ron Sega. Abstract. ...

22nd Fluid Dynamics, Plasma Dynamics and Lasers Conference

AIP Conference Proceedings, 1995

23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference, 1993

31st Aerospace Sciences Meeting, 1993

The recontamination of a spacecraft surface directly exposed to the ram flux is investigated. It ... more The recontamination of a spacecraft surface directly exposed to the ram flux is investigated. It is assumed that the surface has been contaminated by a rocket plume contact and that, subsequent to the exposure, the contaminated surface is placed in the ram flux. A BGK-simulation was compared to both a Direct Simulation Monte Carlo (DSMC) and a Full Flow Monte Carlo (FFMC) using sensitivity analysis. Results indicate that the BGK-based simulation underpredicted the return flux contamination as compared to both the DSMC and FFMC techniques. Results from the full flow model suggest that the BGK model is inadequate to represent this physical problem.

Flight Simualtion Technologies Conference, 1988

Journal of Thermophysics and Heat Transfer, 1994

The recontamination of a spacecraft surface, directly exposed to the ram flux, is examined. The s... more The recontamination of a spacecraft surface, directly exposed to the ram flux, is examined. The specific problem considered assumes that a surface has been contaminated by a rocket plume and that, subsequent to the exposure, the contaminated surface is placed in the ram flux. Given a fixed desorption rate, the level of recontamination of the surface by the return flux contact is calculated. The calculations are done using a BGK-based method, a direct simulation Monte Carlo (DSMC)-based method, and a full flow Monte Carlo (FFMC)-based method. Surface accommodation is included because it has been shown to have a noticeable effect on the near-wake environment.

Journal of Computational Physics, 1995

27th Thermophysics Conference, 1992

Abstract A flow simulation for charged and neutral particles around spacecraft is given that comb... more Abstract A flow simulation for charged and neutral particles around spacecraft is given that combines the fully coupled effects of neutral particle flow, plasma flow, electromagnetic field effects, and spacecraft charging. The simulation allows for chemically reacting flows ( ...