Nagi N. Mansour
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View article: Leveraging BIM for Proactive Dispute Avoidance in Construction Projects
Leveraging BIM for Proactive Dispute Avoidance in Construction Projects Open
The construction industry faces persistent challenges from disputes and claims, leading to delays, cost overruns, and strained stakeholder relationships. This study proposes a strategic framework that integrates building information modeli…
View article: Flow Mechanics in Ablative Thermal Protection Systems
Flow Mechanics in Ablative Thermal Protection Systems Open
Ablative thermal protection systems have experienced renewed interest in the past decade owing to the retirement of NASA's Space Shuttle fleet and the US presidential mandate to develop technologies that enable humans to explore space beyo…
View article: Update 3.0 to “PuMA: The Porous Microstructure Analysis software”, (PII:S2352711018300281)
Update 3.0 to “PuMA: The Porous Microstructure Analysis software”, (PII:S2352711018300281) Open
A major update of the Porous Microstructure Analysis (PuMA) software is presented. PuMA is a framework for computing effective material properties and response based on material microstructures. Version 3.0 of the software extends the PuMA…
View article: 3D GLASS -- Acoustic Solar Modeling of Background Flows
3D GLASS -- Acoustic Solar Modeling of Background Flows Open
We present a 3-dimensional (3D) numerical solver of the linearized compressible Euler equations (3D GLASS -- GLobal Acoustic Solar Simulation), used to model acoustic oscillations throughout the solar interior. The governing equations are …
View article: Preliminary Measurements of the Motion of Arcjet Current Channel Using Inductive Magnetic Probes
Preliminary Measurements of the Motion of Arcjet Current Channel Using Inductive Magnetic Probes Open
This paper covers the design and first measurements of non-perturbative, external inductive magnetic diagnostics for arcjet constrictors which can measure the motion of the arc current channel. These measurements of arc motion are motivate…
View article: Interactive volumetric segmentation for textile micro‐tomography data using wavelets and nonlocal means
Interactive volumetric segmentation for textile micro‐tomography data using wavelets and nonlocal means Open
This work addresses segmentation of volumetric images of woven carbon fiber textiles from micro‐tomography data. We propose a semi‐supervised algorithm to classify carbon fibers that requires sparse input as opposed to completely labeled i…
View article: Simulation of HyMETS Flowfield around Baby-SPRITE Entry Probe
Simulation of HyMETS Flowfield around Baby-SPRITE Entry Probe Open
Arc-jets are unique facilities used in research, development, and evaluation of high-temperature thermal protection systems for hypersonic vehicles and planetary entry systems. Thermochemical non-equilibrium computational fluid dynamics si…
View article: The Origin of Deep Acoustic Sources Associated with Solar Magnetic Structures
The Origin of Deep Acoustic Sources Associated with Solar Magnetic Structures Open
It is generally accepted that solar acoustic ( p ) modes are excited by near-surface turbulent motions, in particular by downdrafts and interacting vortices in intergranular lanes. Recent analysis of Solar Dynamics Observatory data by Zhao…
View article: Multicomponent fluid model for two-temperature plasmas derived from kinetic theory : application to magnetic reconnection
Multicomponent fluid model for two-temperature plasmas derived from kinetic theory : application to magnetic reconnection Open
This contribution deals with the fluid modeling of multicomponent magnetized plasmas in thermo-chemical non-equilibrium from the partially- to fully-ionized collisional regimes, aiming at the predictive simulation of magnetic reconnection …
View article: Roadmap for Reliable Ensemble Forecasting of the Sun-Earth System
Roadmap for Reliable Ensemble Forecasting of the Sun-Earth System Open
The authors of this report met on 28-30 March 2018 at the New Jersey Institute of Technology, Newark, New Jersey, for a 3-day workshop that brought together a group of data providers, expert modelers, and computer and data scientists, in t…
View article: Significance of DSMC Computed Aerothermal Environments in the Rarefied Regime for Atmospheric Entry Material Response
Significance of DSMC Computed Aerothermal Environments in the Rarefied Regime for Atmospheric Entry Material Response Open
During Mars atmospheric entry, the Mars Science Laboratory (MSL) was protected by a 4.5 meters diameter ablative heatshield assembled in 113 tiles. The heatshield was made of NASA's flagship ablative material, the Phenolic Impregnated Carb…
View article: Synchrotron X-ray Micro Tomography at the Advanced Light Source: In-Situ Sample Environments for Advanced Aerospace Materials
Synchrotron X-ray Micro Tomography at the Advanced Light Source: In-Situ Sample Environments for Advanced Aerospace Materials Open
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View article: Inverse Determination of Aeroheating and Charring Ablator Response
Inverse Determination of Aeroheating and Charring Ablator Response Open
The Mars Science Laboratory (MSL) was protected during its Mars atmospheric entry by an instrumented heatshield that used NASA's Phenolic Impregnated Carbon Ablator (PICA). PICA is a lightweight carbon fiber/polymeric resin material that o…
View article: A Versatile Numerical Method for the Multi-Fluid Plasma Model in Partially- and Fully-Ionized Plasmas
A Versatile Numerical Method for the Multi-Fluid Plasma Model in Partially- and Fully-Ionized Plasmas Open
© 2018 Institute of Physics Publishing. All rights reserved. We present an innovative numerical method that solves for the multi-fluid plasma equations, including the transport, frictional, and chemical reactions terms, coupled to full Max…
View article: Integrated Real-Time Modeling System for Heliospheric Space Weather Forecasting
Integrated Real-Time Modeling System for Heliospheric Space Weather Forecasting Open
The Sun lies at the center of space weather and is the source of its variability. The primary input to coronal and solar wind models is the activity of the magnetic field in the solar photosphere. What is needed is to develop physics-based…
View article: Solar Activity Across the Scales: From Small-Scale Quiet-Sun Dynamics to Magnetic Activity Cycles
Solar Activity Across the Scales: From Small-Scale Quiet-Sun Dynamics to Magnetic Activity Cycles Open
Observations as well as numerical and theoretical models show that solar dynamics is characterized by complicated interactions and energy exchanges among different temporal and spatial scales. It reveals magnetic self-organization processe…
View article: Modeling the Relationship Between Porosity and Permeability During Oxidation of Ablative Materials
Modeling the Relationship Between Porosity and Permeability During Oxidation of Ablative Materials Open
The ablative materials used in thermal protection systems (TPS) undergo oxidation during atmospheric entry which leads to an in-depth change in both permeability and porosity. These properties have a significant affect on heat transfer in …
View article: Effect of Radiation on Chromospheric Magnetic Reconnection: Reactive and Collisional Multi-fluid Simulations
Effect of Radiation on Chromospheric Magnetic Reconnection: Reactive and Collisional Multi-fluid Simulations Open
We study magnetic reconnection under chromospheric conditions in five different ionization levels from 0.5% to 50% using a self-consistent two-fluid (ions + neutrals) model that accounts for compressibility, collisional effects, chemical i…
View article: From Tomography to Material Properties of Thermal Protection Systems
From Tomography to Material Properties of Thermal Protection Systems Open
The X-ray micro-tomography technique provides non-destructive characterizations of three-dimensional material micro-structures at spatial resolutions from the sub-micron to the centimeter scale. High quality micro-tomography images of NASA…
View article: Are tachoclines important for solar and stellar dynamos? What can we learn from global simulations
Are tachoclines important for solar and stellar dynamos? What can we learn from global simulations Open
The role of tachoclines, the thin shear layers that separate solid body from differential rotation in the interior of late-type stars, in stellar dynamos is still controversial. In this work we discuss their relevance in view of recent res…