Yousry Y Azmy

Works (27)

Updated: August 26th, 2024 08:19

2024 journal article

The general collision-count source method for ray effects mitigation in SN<i> <sub>N</sub></i><sub> </sub>problems using Monte Carlo coupling

PROGRESS IN NUCLEAR ENERGY, 176.

By: N. Herring, K. Beyer, R. Yessayan, J. Donato, Y. Azmy* & B. Kiedrowski

author keywords: Neutronics; Ray effects; Transport; Monte Carlo; Discrete ordinates
UN Sustainable Development Goal Categories
13. Climate Action (OpenAlex)
Source: Web Of Science
Added: August 19, 2024

2021 journal article

Hybrid approaches for accelerated convergence of block-Jacobi iterative methods for solution of the neutron transport equation

JOURNAL OF COMPUTATIONAL PHYSICS, 439.

By: D. Hoagland n & Y. Azmy n

author keywords: Neutron transport; Iterative methods; Hybrid methods; Deterministic; Parallel
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: June 21, 2021

2021 journal article

On the Regularity Order of the Pointwise Uncollided Angular Flux and Asymptotic Convergence of the Discrete Ordinates Approximation of the Scalar Flux

NUCLEAR SCIENCE AND ENGINEERING, 195(6), 598–613.

By: X. Hu n & Y. Azmy n

author keywords: Discrete Ordinates; angular discretization; quadrature error; pointwise uncollided scalar flux error; Simpson's Rule
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: February 22, 2021

2021 article

Solution Irregularity Remediation for Spatial Discretization Error Estimation for S-N Transport Solutions

Hart, N. H., & Azmy, Y. Y. (2021, November 8). NUCLEAR SCIENCE AND ENGINEERING.

By: N. Hart n & Y. Azmy n

author keywords: Spatial discretization; error estimation; solution regularity; singular characteristics
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: November 15, 2021

2021 article

Solution of the Neutron Transport Equation on Unstructured Grids Using the Parallel Block Jacobi-Integral Transport Matrix Method via the Novel Green's Function ITMM Construction Algorithm on Massively Parallel Computer Systems

Hoagland, D. S., Yessayan, R. A., & Azmy, Y. Y. (2021, May 10). NUCLEAR SCIENCE AND ENGINEERING.

By: D. Hoagland n, R. Yessayan n & Y. Azmy n

author keywords: Neutron transport; massively parallel; unstructured grids; Parallel Block Jacobi
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: June 10, 2021

2019 journal article

Asymptotic convergence of the angular discretization error in the scalar flux computed from the particle transport equation with the method of discrete ordinates

ANNALS OF NUCLEAR ENERGY, 138.

By: X. Hu n & Y. Azmy n

author keywords: Discrete ordinates method; Angular discretization error; Transport equation; Numerical quadrature
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: March 2, 2020

2019 journal article

Sequential optimal positioning of mobile sensors using mutual information

STATISTICAL ANALYSIS AND DATA MINING, 12(6), 465–478.

By: K. Schmidt*, R. Smith n, J. Hite n, J. Mattingly n, Y. Azmy n, D. Rajan*, R. Goldhahn*

author keywords: Bayesian inference; inverse problem; mutual information; sensor placement; source localization
TL;DR: While most mobile sensor strategies designate a trajectory for sensor movement, this work instead employs mutual information, based on Shannon entropy, to choose the next measurement location from a discrete set of design conditions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
11. Sustainable Cities and Communities (Web of Science; OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: August 12, 2019

2017 journal article

Numerical convergence and validation of the DIMP inverse particle transport model

Nuclear Engineering and Technology, 49(6), 1358–1367.

By: N. Nelson n & Y. Azmy n

author keywords: Inverse Problem; Particle Transport; DIMP; Convergence Analysis; Validation; Bayesian Inference; Quasi-Newton; Optimization
Source: Crossref
Added: February 24, 2020

2017 journal article

Validation and uncertainty quantification of detector response functions for a 1″×2″ NaI collimated detector intended for inverse radioisotope source mapping applications

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 410, 1–15.

By: N. Nelson n, Y. Azmy n, R. Gardner n, J. Mattingly n, R. Smith n, L. Worrall*, S. Dewji*

author keywords: Nal collimated detector; Response function; Validation; Uncertainty quantification; Holdup measurements
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Crossref, NC State University Libraries
Added: June 30, 2019

2016 journal article

Recent Studies on the Asymptotic Convergence of the Spatial Discretization for Two-Dimensional Discrete Ordinates Solutions

JOURNAL OF COMPUTATIONAL AND THEORETICAL TRANSPORT, 45(4), 299–313.

By: L. Barichello*, A. Tres*, C. Picoloto* & Y. Azmy n

author keywords: Discrete ordinates; Two-dimensional geometry; Asymptotic Spatial Convergence
TL;DR: Four types of quadrature schemes are used to define discrete directions in the solution of a two-dimensional fixed-source discrete ordinates problem in Cartesian geometry and it was more clearly observed that the spatial discretization error converges asymptotically with second order for the source region with all four quadratures employed. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2015 journal article

Comparison of spatial discretization methods for solving the S-N equations using a three-dimensional method of manufactured solutions benchmark suite with escalating order of nonsmoothness

Nuclear Science and Engineering, 180(1), 1–29.

By: S. Schunert n & Y. Azmy n

TL;DR: A suite of method of manufactured solutions benchmarks that provides an exact solution of the SN equations even in the presence of scattering is developed, and a new singular-characteristic tracking method for three-dimensional geometries performs best among the considered methods. (via Semantic Scholar)
Source: NC State University Libraries
Added: August 6, 2018

2015 journal article

Iterative stability analysis of spatial domain decomposition based on block Jacobi algorithm for the diamond-difference scheme

JOURNAL OF COMPUTATIONAL PHYSICS, 297, 462–479.

By: D. Anistratov n & Y. Azmy n

author keywords: Particle transport equation; Radiative transfer equation; Domain decomposition; Iterative methods; Fourier analysis
TL;DR: Numerical results of finite-medium problems are presented and show that for finite domains iterative convergence to a finite criterion is achievable in a multiple of the sum of number of cells in each dimension. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2015 journal article

Radiation Source Mapping with Bayesian Inverse Methods

NUCLEAR SCIENCE AND ENGINEERING, 179(4), 364–380.

By: J. Hykes n & Y. Azmy n

TL;DR: A method to map the spectral and spatial distributions of radioactive sources using a limited number of detectors using the Denovo code and a probabilistic Bayesian approach to solve the resulting inverse problem. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2013 journal article

Using the Cartesian Discrete Ordinates Code DORT for Assembly-Level Calculations

NUCLEAR SCIENCE AND ENGINEERING, 173(3), 233–258.

By: S. Schunert n & Y. Azmy n

TL;DR: It is found that for the BWR assembly DORT outperforms MOC and CP in both accuracy and computational efficiency, while for the PWR test case, MOC computes the most accurate fission source distribution but fails to compute the multiplication factor accurately. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2012 journal article

A Robust Arbitrarily High-Order Transport Method of the Characteristic Type for Unstructured Grids

NUCLEAR SCIENCE AND ENGINEERING, 172(1), 33–51.

By: R. Ferrer* & Y. Azmy n

TL;DR: A general equivalence between the arbitrary- order neutron balance and arbitrary-order characteristic equations is derived, which improves the numerical computation of the spatial moments of the angular flux and allows a series expansion of the characteristic integral kernel in cases where the medium is optically thin. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2011 journal article

Newton's Method for Solving k-Eigenvalue Problems in Neutron Diffusion Theory

NUCLEAR SCIENCE AND ENGINEERING, 167(2), 141–153.

By: D. Gill* & Y. Azmy n

TL;DR: Numerical results generated for a suite of two-dimensional reactor benchmarks show the feasibility and computational benefits of the Newton formulation as well as examine some of the numerical difficulties potentially encountered with Newton-Krylov methods. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2011 journal article

Newton's Method for the Computation of k-Eigenvalues in S-N Transport Applications

NUCLEAR SCIENCE AND ENGINEERING, 168(1), 37–58.

By: D. Gill*, Y. Azmy n, J. Warsa* & J. Densmore*

TL;DR: This work proposes an improvement to Newton’s method (NM) for solving the k-eigenvalue problem in transport theory that avoids costly within-group iterations or iterations over energy groups, and presents a formulation of this problem where a nonlinear function is written in terms of a generic fixed-point iteration (FPI). (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2010 journal article

On the Degradation of Cell-Centered Diffusive Preconditioners for Accelerating S-N Transport Calculations in the Periodic Horizontal Interface Configuration

NUCLEAR SCIENCE AND ENGINEERING, 166(3), 218–238.

By: M. Rosa*, Y. Azmy n & J. Morel*

UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2009 article

A posteriori error estimator and AMR for discrete ordinates nodal transport methods

Duo, J. I., Azmy, Y. Y., & Zikatanov, L. T. (2009, April). ANNALS OF NUCLEAR ENERGY, Vol. 36, pp. 268–273.

By: J. Duo*, Y. Azmy n & L. Zikatanov*

TL;DR: An a posteriori error estimator is derived based on the nodal solution of the Arbitrarily High Order Transport Method of the Nodal type (AHOT-N) and bounds the global error norms and that the error indicator follows the cell-error’s spatial distribution pattern closely. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2009 journal article

Properties of the S-N-equivalent integral transport operator in slab geometry and the iterative acceleration of neutral particle transport methods

Nuclear Science and Engineering, 162(3), 234–252.

By: M. Rosa*, Y. Azmy n & J. Morel*

UN Sustainable Development Goal Categories
Source: NC State University Libraries
Added: August 6, 2018

2009 journal article

Spatial Convergence Study of Discrete Ordinates Methods Via the Singular Characteristic Tracking Algorithm

NUCLEAR SCIENCE AND ENGINEERING, 162(1), 41–55.

By: J. Duo* & Y. Azmy n

UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2009 article

TORT solutions to the NEA suite of benchmarks for 3D transport methods and codes over a range in parameter space

Bekar, K. B., & Azmy, Y. Y. (2009, April). ANNALS OF NUCLEAR ENERGY, Vol. 36, pp. 368–374.

By: K. Bekar* & Y. Azmy n

TL;DR: Improved TORT solutions to the 3D transport codes' suite of benchmarks exercise are presented in this study and show that the accuracy of most benchmark cases improved substantially. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2008 journal article

Computational Modelling of Genome-Side Transcription Assembly Networks Using a Fluidics Analogy

PLOS ONE, 3(8).

By: Y. Azmy*, A. Gupta* & F. Pugh*

MeSH headings : Computational Biology / methods; DNA / genetics; Gene Expression Profiling / methods; Genome; Models, Genetic; Multigene Family; Oligonucleotide Array Sequence Analysis; RNA, Messenger / genetics; Transcription Factors / genetics; Transcription, Genetic
TL;DR: A computational tool to aid in assessing the plausibility of gene regulatory models derived from genome-wide expression profiling of cells mutant for transcription regulators derived from large genomic data sets is developed. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2007 journal article

Comparison via parallel performance models of angular and spatial domain decompositions for solving neutral particle transport problems

Progress in Nuclear Energy, 49(1), 37–60.

By: J. Fischer & Y. Azmy*

author keywords: neutral particle transport; discrete ordinates; parallel mesh sweep; multiprocessing; spatial domain decomposition; angular domain decomposition
TL;DR: The primary question addressed in this work is for a given problem size, which domain decomposition scheme, angular or spatial, is best suited to parallelize discrete ordinates methods on a specific computational platform? (via Semantic Scholar)
Source: Crossref
Added: August 28, 2020

2006 journal article

Modeling and optimization of existing beam port facility of PSBR

Annals of Nuclear Energy, 33(17-18), 1391–1395.

By: F. Alim*, K. Bekar*, K. Ivanov*, K. Unlu*, J. Brenizer* & Y. Azmy*

TL;DR: Examining the existing BPs for neutron and gamma outputs and developing a new core-moderator location and BP geometry in PSBR finds some artificial models developed and compared with the original model. (via Semantic Scholar)
Sources: Crossref, NC State University Libraries
Added: August 28, 2020

2006 journal article

Tort solutions to the three-dimensional MOX benchmark, 3-D Extension C5G7MOX

Progress in Nuclear Energy, 48(5), 445–455.

By: J. Klingensmith*, Y. Azmy*, J. Gehin* & R. Orsi*

author keywords: TORT; discrete-ordinates; C5G7MOX benchmark; multiplication factor; pin power distribution
Source: Crossref
Added: August 28, 2020

2004 journal article

Dort solutions to the two-dimensional C5G7MOXbenchmark problem

Progress in Nuclear Energy, 45(2-4), 215–231.

By: Y. Azmy*, J. Gehin* & R. Orsi*

author keywords: DORT; MOX; discrete-ordinates; benchmark; accuracy
TL;DR: The results also illustrate DORT's high accuracy on reasonable meshes and quadrature orders, as well as the sufficiency of a crude, square, geometric approximation of the rod-moderator interface to achieve high accuracy. (via Semantic Scholar)
Source: Crossref
Added: August 28, 2020

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