The Fully Implicit Ablation and Thermal response program (FIAT) simulates one-dimensional transie... more The Fully Implicit Ablation and Thermal response program (FIAT) simulates one-dimensional transient thermal energy transport in a multilayer stack of thermal protection system (TPS) materials and structure that can ablate from the top surface and decompose in-depth. Recently, a number of upgrades have been incorporated into a second version of FIAT. This new version, named FIATv2, is available from NASA Ames Research Center to qualified individuals and organizations. The purpose of this paper is to describe and demonstrate the expanded capabilities of FIATv2.
Analytic formulations are presented for the analysis of an arc-heater electrode with a rotating a... more Analytic formulations are presented for the analysis of an arc-heater electrode with a rotating arc foot. Two limiting cases, a smoothly rotating arc foot and an arc foot that jumps between multiple sticking points, are analyzed. For each case the temperature distribution for a copper electrode is obtained for the plausible range of operating conditions. It is shown that the
In the steady laminar flow past a sudden channel expansion at large Reynolds number R, the longit... more In the steady laminar flow past a sudden channel expansion at large Reynolds number R, the longitudinal length scale of the separated eddy typically increases linearly with R whereas the transverse length scale is O(1). If these trends were to continue indefinitely, the equations ...
The relationship between total enthalpy and the flow parameters of two types of electric arc jets... more The relationship between total enthalpy and the flow parameters of two types of electric arc jets is discussed. A simple equation for the supersonic arc jet, based on ARCFLO code calculations for mass-average total enthalpy, is presented in terms of a sonic flow parameter. At enthalpies greater than about 25 MJ/kg, this equation shows better agreement with experimental arc jet data than a previous equation.
The RPCMA code has been developed for calculation of the transient thermochemical response of har... more The RPCMA code has been developed for calculation of the transient thermochemical response of hardening materials subject to severe heating rates, with particular application to pulsed laser heating. The RPCMA code employs a finite-volume box method with a one-dimensional implicit adaptive grid. The numerical modeling includes equations for mass and energy conservation and material decomposition; the flow of pyrolysis gas
To fulfill the Vision for Space Exploration-successful human and robotic missions to and from oth... more To fulfill the Vision for Space Exploration-successful human and robotic missions to and from other solar system bodies to explore their atmospheres and surfaces-NASA must reduce trip time, cost, and vehicle weight so that payload and scientific experiments capabilities are ...
Analytic formulations are presented for the analysis of an arc-heater electrode with a rotating a... more Analytic formulations are presented for the analysis of an arc-heater electrode with a rotating arc foot. Two limiting cases, a smoothly rotating arc foot and an arc foot that jumps between multiple sticking points, are analyzed. For each case the temperature distribution for a copper electrode is obtained for the plausible range of operating conditions. It is shown that the
The Fully Implicit Ablation and Thermal response program (FIAT) simulates one-dimensional transie... more The Fully Implicit Ablation and Thermal response program (FIAT) simulates one-dimensional transient thermal energy transport in a multilayer stack of thermal protection system (TPS) materials and structure that can ablate from the top surface and decompose in-depth. Recently, a number of upgrades have been incorporated into a second version of FIAT. This new version, named FIATv2, is available from NASA Ames Research Center to qualified individuals and organizations. The purpose of this paper is to describe and demonstrate the expanded capabilities of FIATv2.
Analytic formulations are presented for the analysis of an arc-heater electrode with a rotating a... more Analytic formulations are presented for the analysis of an arc-heater electrode with a rotating arc foot. Two limiting cases, a smoothly rotating arc foot and an arc foot that jumps between multiple sticking points, are analyzed. For each case the temperature distribution for a copper electrode is obtained for the plausible range of operating conditions. It is shown that the
In the steady laminar flow past a sudden channel expansion at large Reynolds number R, the longit... more In the steady laminar flow past a sudden channel expansion at large Reynolds number R, the longitudinal length scale of the separated eddy typically increases linearly with R whereas the transverse length scale is O(1). If these trends were to continue indefinitely, the equations ...
The relationship between total enthalpy and the flow parameters of two types of electric arc jets... more The relationship between total enthalpy and the flow parameters of two types of electric arc jets is discussed. A simple equation for the supersonic arc jet, based on ARCFLO code calculations for mass-average total enthalpy, is presented in terms of a sonic flow parameter. At enthalpies greater than about 25 MJ/kg, this equation shows better agreement with experimental arc jet data than a previous equation.
The RPCMA code has been developed for calculation of the transient thermochemical response of har... more The RPCMA code has been developed for calculation of the transient thermochemical response of hardening materials subject to severe heating rates, with particular application to pulsed laser heating. The RPCMA code employs a finite-volume box method with a one-dimensional implicit adaptive grid. The numerical modeling includes equations for mass and energy conservation and material decomposition; the flow of pyrolysis gas
To fulfill the Vision for Space Exploration-successful human and robotic missions to and from oth... more To fulfill the Vision for Space Exploration-successful human and robotic missions to and from other solar system bodies to explore their atmospheres and surfaces-NASA must reduce trip time, cost, and vehicle weight so that payload and scientific experiments capabilities are ...
Analytic formulations are presented for the analysis of an arc-heater electrode with a rotating a... more Analytic formulations are presented for the analysis of an arc-heater electrode with a rotating arc foot. Two limiting cases, a smoothly rotating arc foot and an arc foot that jumps between multiple sticking points, are analyzed. For each case the temperature distribution for a copper electrode is obtained for the plausible range of operating conditions. It is shown that the
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Papers by Frank Milos