Results 51 to 60 of about 49,045 (194)

The Hamiltonian structure and Euler-Poincar\'{e} formulation of the Vlasov-Maxwell and gyrokinetic systems

open access: yes, 2013
We present a new variational principle for the gyrokinetic system, similar to the Maxwell-Vlasov action presented in Ref. 1. The variational principle is in the Eulerian frame and based on constrained variations of the phase space fluid velocity and ...
Bers L.   +9 more
core   +3 more sources

CFD Simulations of Packed-Bed Combustion: Accounting for Irregularities in Particle Orientation in the Estimation of Bed Radiative Properties

open access: yesChemical Engineering Transactions, 2022
Modelling of packed-bed combustion includes the problem of modelling the radiative heat transfer. Thermal radiation significantly contributes to heat transfer both across the bed and from the hot gases to the top of the fuel layer. Several methods can be
Jirí Strouhal, Tomáš Jurena
doaj   +1 more source

Analysis of stray current induced by cathodic protection on steel-framed masonry structures [PDF]

open access: yes, 2011
Cathodic protection (CP) has been successfully employed to protect steel-framed masonry buildings from corrosion related damage. When a CP system is installed to protect the structural members, other metallic items which are within the fabric of the ...
Lambert, P   +3 more
core   +1 more source

The adjoint transport problem applied to estimate neutral particle leakage in the discrete ordinates formulations

open access: yesBrazilian Journal of Radiation Sciences, 2022
In source–detector problems, neutron leakage is a quantity of interest that could lead to improve shielding structures, thus reducing the dose received by humans.
Jesús Pérez Curbelo   +1 more
doaj   +1 more source

An adaptive, hanging-node, discontinuous isogeometric analysis method for the first-order form of the neutron transport equation with discrete ordinate (SN) angular discretisation [PDF]

open access: yes, 2017
In this paper a discontinuous, hanging-node, isogeometric analysis (IGA) method is developed and applied to the first-order form of the neutron transport equation with a discrete ordinate (SN) angular discretisation in two-dimensional space.
Eaton, M, Kophazi, J, Owens, A, Welch, J
core   +1 more source

Particle Movement in DEM Models and Artificial Neural Network for Validation by Using Contrast Points

open access: yesTechnologies
The calibration and validation of input parameters in the Discrete Element Method (DEM) are crucial for accurately simulating physical processes, typically achieved through experimental particle behavior analysis.
Barbora Černilová   +3 more
doaj   +1 more source

Analysis for the Effect of Spatial Discretization Method on AP1000 Reactor Pressure Vessel Fluence Calculation

open access: yesScience and Technology of Nuclear Installations, 2016
Maintaining the structural integrity of the reactor pressure vessel (RPV) is a critical concern related to the safe operation of nuclear power plants. To estimate the structural integrity over the designed lifetime and to support analyses for a potential
Junxiao Zheng   +3 more
doaj   +1 more source

Verification of the Discrete Ordinates Goal-Oriented Multi-Collision Source Algorithm with Neutron Streaming Problems

open access: yesEnergies, 2022
The shielding calculation of neutron streaming problems with ducts is characterized by the strong anisotropy of angular flux, which poses a challenge for the analysis of nuclear installations.
Xinyu Wang   +3 more
doaj   +1 more source

Discrete-Ordinates Modelling of the Radiative Heat Transfer in a Pilot-Scale Rotary Kiln

open access: yesEnergies, 2020
This paper presents work focused on the development, evaluation and use of a 3D model for investigation of the radiative heat transfer in rotary kilns.
Adrian Gunnarsson   +3 more
doaj   +1 more source

Discrete ordinates (SN) method for the first solution of the transport equation using Chebyshev polynomials

open access: yesEPJ Web of Conferences, 2016
First estimates for the numerical solution of the one-dimensional neutron transport equation for one-speed neutrons in a finite homogeneous slab is studied. The neutrons are assumed to be scattered isotropically through the medium.
Öztürk Hakan
doaj   +1 more source

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