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Journal articles on the topic 'Reconstruction et simulations de flux'

Author: Grafiati

Published: 25 January 2025

Last updated: 31 July 2025

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1

Matringe, Sebastien F., Ruben Juanes, and Hamdi A. Tchelepi. "Tracing Streamlines on Unstructured Grids From Finite Volume Discretizations." SPE Journal 13, no. 04 (2008): 423–31. http://dx.doi.org/10.2118/103295-pa.

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Summary The accuracy of streamline reservoir simulations depends strongly on the quality of the velocity field and the accuracy of the streamline tracing method. For problems described on complex grids (e.g., corner-point geometry or fully unstructured grids) with full-tensor permeabilities, advanced discretization methods, such as the family of multipoint flux approximation (MPFA) schemes, are necessary to obtain an accurate representation of the fluxes across control volume faces. These fluxes are then interpolated to define the velocity field within each control volume, which is then used t

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2

Zerrik, E., and H. Bourray. "Flux reconstruction: sensors and simulations." Sensors and Actuators A: Physical 109, no. 1-2 (2003): 34–46. http://dx.doi.org/10.1016/s0924-4247(03)00358-3.

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3

Khazari, Adil, and Ali Boutoulout. "Flux reconstruction for hyperbolic systems: Sensors and simulations." Evolution Equations & Control Theory 4, no. 2 (2015): 177–92. http://dx.doi.org/10.3934/eect.2015.4.177.

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4

Jessen, Kristian, Margot G. Gerritsen, and Bradley T. Mallison. "High-Resolution Prediction of Enhanced Condensate Recovery Processes." SPE Journal 13, no. 02 (2008): 257–66. http://dx.doi.org/10.2118/99619-pa.

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Summary This paper investigates the accuracy of first- and high-order numerical methods in simulating enhanced condensate processes in 1D, 2D, and 3D. We compare the predictions of a standard single point upwind (SPU) scheme with a third-order accurate finite difference (FD) simulator based on a third-order essentially nonoscillatory (ENO) flux reconstruction with matching temporal accuracy. We include physical dispersion in the mathematical model of these multiphase, multicomponent systems. The comparisons demonstrate that SPU schemes may fail to predict the formation of the mobile liquid ban

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5

Török, T., M. G. Linton, J. E. Leake, et al. "Solar Eruptions Triggered by Flux Emergence below or near a Coronal Flux Rope." Astrophysical Journal 962, no. 2 (2024): 149. http://dx.doi.org/10.3847/1538-4357/ad1826.

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Abstract Observations have shown a clear association of filament/prominence eruptions with the emergence of magnetic flux in or near filament channels. Magnetohydrodynamic (MHD) simulations have been employed to systematically study the conditions under which such eruptions occur. These simulations to date have modeled filament channels as 2D flux ropes or 3D uniformly sheared arcades. Here we present MHD simulations of flux emergence into a more realistic configuration consisting of a bipolar active region containing a line-tied 3D flux rope. We use the coronal flux-rope model of Titov et al.

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Trojak, W., N. R. Vadlamani, J. Tyacke, F. D. Witherden, and A. Jameson. "Artificial compressibility approaches in flux reconstruction for incompressible viscous flow simulations." Computers & Fluids 247 (October 2022): 105634. http://dx.doi.org/10.1016/j.compfluid.2022.105634.

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7

Ding, Yan, Sung-Chan Kim, Richard B. Styles, and Rusty L. Permenter. "SIMULATION OF LONG-TERM SHORELINE CHANGE DRIVEN BY LONGSHORE AND CROSS-SHORE SEDIMENT TRANSPORT." Coastal Engineering Proceedings, no. 36v (December 28, 2020): 31. http://dx.doi.org/10.9753/icce.v36v.sediment.31.

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Driven by wave and current, sediment transport alongshore and cross-shore induces shoreline changes in coasts. Estimated by breaking wave energy flux, longshore sediment transport in littoral zone has been studied for decades. Cross-shore sediment transport can be significant in a gentle-slope beach and a barred coast due to bar migration. Short-term beach profile evolution (typically for a few days or weeks) has been successfully simulated by reconstructing nonlinear wave shape in nearshore zone (e.g. Hsu et al 2006, Fernandez-Mora et al. 2015). However, it is still lack of knowledge on the r

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Huang, Lawrence, Rupert A. C. Croft та Hitesh Arora. "Deep forest: Neural network reconstruction of the Lyman-α forest". Monthly Notices of the Royal Astronomical Society 506, № 4 (2021): 5212–22. http://dx.doi.org/10.1093/mnras/stab2041.

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ABSTRACT We explore the use of Deep Learning to infer physical quantities from the observable transmitted flux in the Ly α forest. We train a Neural Network using redshift z = 3 outputs from cosmological hydrodynamic simulations and mock data sets constructed from them. We evaluate how well the trained network is able to reconstruct the optical depth for Ly α forest absorption from noisy and often saturated transmitted flux data. The Neural Network outperforms an alternative reconstruction method involving log inversion and spline interpolation by approximately a factor of 2 in the optical dep

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9

Zunz, V., and H. Goosse. "Influence of freshwater input on the skill of decadal forecast of sea ice in the Southern Ocean." Cryosphere 9, no. 2 (2015): 541–56. http://dx.doi.org/10.5194/tc-9-541-2015.

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Abstract. Recent studies have investigated the potential link between the freshwater input derived from the melting of the Antarctic ice sheet and the observed recent increase in sea ice extent in the Southern Ocean. In this study, we assess the impact of an additional freshwater flux on the trend in sea ice extent and concentration in simulations with data assimilation, spanning the period 1850–2009, as well as in retrospective forecasts (hindcasts) initialised in 1980. In the simulations with data assimilation, the inclusion of an additional freshwater flux that follows an autoregressive pro

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10

Liu, Chunlei, and Richard P. Allan. "Unrealistic Increases in Wind Speed Explain Reduced Eastern Pacific Heat Flux in Reanalyses." Journal of Climate 31, no. 8 (2018): 2981–93. http://dx.doi.org/10.1175/jcli-d-17-0642.1.

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Abstract Tropical eastern Pacific sea surface temperature plays a pivotal role in mechanisms that determine global mean surface temperature variability. In this study, the surface flux contribution to recent cooling of the tropical eastern Pacific is investigated using data from three atmospheric reanalyses with full assimilation of observations, an observation-based net surface energy flux reconstruction, and 15 atmosphere-only climate model simulations. For ERA-Interim, 78% of the decrease in net surface flux (−0.65 W m−2 yr−1 over 1988–2008) is explained by the latent heat flux variability.

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11

Oudrane, Abdellatif, Benaoumeur Aour, Belkacem Zeghmati, Xavier Chesneau, and Messaoud Hamouda. "Etude et calcul de bilan de la densité du flux solaire pour un simple habitat dans la région d’Adrar." Journal of Renewable Energies 20, no. 1 (2023): 51–60. http://dx.doi.org/10.54966/jreen.v20i1.608.

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L’objectif principal de ce travail est d’étudier l’effet des conditions climatiques externes, sur l’évolution de la densité du flux solaire journalier incident sur les parois verticales d’un bâtiment situé dans la région d’Adrar au Sud de l’Algérie avec diffèrent orientation. Ce bâtiment est conçu pour des a1pplications de type chauffage ou climatisation. Les simulations numériques abordées dans ce travail ont permis de comparer la variation de la densité du flux solaire incident durant une journée complète sur les parois Sud, Est, Nord et Ouest du bâtiment aux valeurs du flux solaire global s

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12

Kruegler, James, Jesus Gomez-Velez, Laura K. Lautz, and Theodore A. Endreny. "Dynamic Evapotranspiration Alters Hyporheic Flow and Residence Times in the Intrameander Zone." Water 12, no. 2 (2020): 424. http://dx.doi.org/10.3390/w12020424.

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Hyporheic zones (HZs) influence biogeochemistry at the local reach scale with potential implication for water quality at the large catchment scale. The characteristics of the HZs (e.g., area, flux rates, and residence times) change in response to channel and aquifer physical properties, as well as to transient perturbations in the stream–aquifer system such as floods and groundwater withdraws due to evapotranspiration (ET) and pumping. In this study, we use a numerical model to evaluate the effects of transient near-stream evapotranspiration (ET) on the area, exchange flux, and residence time

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13

Mihalache, Ovidiu, and Toshihiko Yamaguchi. "Fast reconstruction of the magnetization of a Halbach magnet in EMAT using experimental measurements." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (2020): 905–12. http://dx.doi.org/10.3233/jae-209404.

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The paper presents a fast and accurate algorithm to reconstruct the magnetization model of parallelepiped magnet (parts of a Halbach magnet array) or the Halbach magnet array used in an electromagnetic acoustic (EMAT) transducer. The model accuracy is validated against measurements of the magnetic flux distributions above surface of block magnets or Halbach magnet array using 2D/3D theoretical formula to compute magnetic flux distribution, validated by 2D/3D FEM simulations, and based on a non-uniform distribution of reconstructed magnetization model (using only main magnetization component).

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14

Halloran, P. R. "Does atmospheric CO<sub>2</sub> seasonality play an important role in governing the air-sea flux of CO<sub>2</sub>?" Biogeosciences 9, no. 6 (2012): 2311–23. http://dx.doi.org/10.5194/bg-9-2311-2012.

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Abstract. The amplitude, phase, and form of the seasonal cycle of atmospheric CO2 concentrations varies on many time and space scales (Peters et al., 2007). Intra-annual CO2 variation is primarily driven by seasonal uptake and release of CO2 by the terrestrial biosphere (Machta et al., 1977; Buchwitz et al., 2007), with a small (Cadule et al., 2010; Heimann et al., 1998), but potentially changing (Gorgues et al., 2010) contribution from the ocean. Variability in the magnitude, spatial distribution, and seasonal drivers of terrestrial net primary productivity (NPP) will be induced by, amongst o

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15

Dzanic, T., S. S. Girimaji, and F. D. Witherden. "Partially-averaged Navier–Stokes simulations of turbulence within a high-order flux reconstruction framework." Journal of Computational Physics 456 (May 2022): 110992. http://dx.doi.org/10.1016/j.jcp.2022.110992.

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16

Le Bras, Sophie, Hugues Deniau, and Christophe Bogey. "A technique of flux reconstruction at the interfaces of nonconforming grids for aeroacoustic simulations." International Journal for Numerical Methods in Fluids 91, no. 12 (2019): 587–614. http://dx.doi.org/10.1002/fld.4767.

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17

Son, Donghui, Yeonwoo Jang, and Tetsuya Magara. "A Comparative Analysis of High-resolution Shock-capturing Schemes for Two-dimensional Magnetohydrodynamic Simulation of Flux Emergence in the Solar Atmosphere." Astrophysical Journal Supplement Series 277, no. 2 (2025): 46. https://doi.org/10.3847/1538-4365/adb617.

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Abstract This study presents a comparative analysis of high-resolution shock-capturing schemes in two-dimensional magnetohydrodynamic (MHD) simulations of magnetic flux emergence in the solar atmosphere. We evaluate four distinct reconstruction techniques based on recent improvements to the weighted essentially nonoscillatory (WENO) and targeted essentially nonoscillatory schemes. While these schemes have proven successful for the Euler equations of gas dynamics, their effectiveness in MHD simulations remains relatively unexplored. Our implementation combines the Harten–Lax–van Leer-discontinu

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18

Zhou, Bowen, and Fotini Katopodes Chow. "Large-Eddy Simulation of the Stable Boundary Layer with Explicit Filtering and Reconstruction Turbulence Modeling." Journal of the Atmospheric Sciences 68, no. 9 (2011): 2142–55. http://dx.doi.org/10.1175/2011jas3693.1.

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Abstract Large-eddy simulation (LES) of the stably stratified atmospheric boundary layer is performed using an explicit filtering and reconstruction approach with a finite difference method. Turbulent stresses are split into the resolvable subfilter-scale and subgrid-scale stresses. The former are recovered from a reconstruction approach, and the latter are represented by a dynamic eddy-viscosity model. The resulting dynamic reconstruction model (DRM) can sustain resolved turbulence with less stringent resolution requirements than conventional closure models, even under strong atmospheric stab

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19

Lionello, Roberto, Cooper Downs, Emily I. Mason, et al. "Global MHD Simulations of the Time-dependent Corona." Astrophysical Journal 959, no. 2 (2023): 77. http://dx.doi.org/10.3847/1538-4357/ad00be.

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Abstract We describe, test, and apply a technique to incorporate full-Sun, surface flux evolution into an MHD model of the global solar corona. Requiring only maps of the evolving surface flux, our method is similar to that of Lionello et al., but we introduce two ways to correct the electric field at the lower boundary to mitigate spurious currents. We verify the accuracy of our procedures by comparing to a reference simulation, driven with known flows and electric fields. We then present a thermodynamic MHD calculation lasting one solar rotation driven by maps from the magnetic flux evolutio

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20

Di Giannatale, Giovanni, Arnas Volčokas, Justin Ball, et al. "Global electromagnetic gyrokinetic simulations of internal transport barriers in reversed-shear tokamaks." Plasma Physics and Controlled Fusion 67, no. 7 (2025): 075008. https://doi.org/10.1088/1361-6587/ade1f7.

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Abstract Internal transport barriers (ITB) form through turbulence suppression, often observed when the safety factor profile exhibits an off-axis minimum. This work aims at improving our understanding of the conditions enabling the development of an ITB, using a more comprehensive physical model, including low-β electromagnetic flux-driven simulations. Our key findings are that electron dynamics is crucial for ITB formation even in an ITG scenario and that having q min close to a lowest order rational value (2 in our simulations) to allow for eddies self-interaction is a necessary ingredient.

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21

Wilson, David J., Allison Youngblood, Odette Toloza та ін. "Testing Lyα Emission-line Reconstruction Routines at Multiple Velocities in One System". Astrophysical Journal 936, № 2 (2022): 189. http://dx.doi.org/10.3847/1538-4357/ac87a8.

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Abstract The 1215.67 Å H i Lyα emission line dominates the ultraviolet flux of low-mass stars, including the majority of known exoplanet hosts. Unfortunately, strong attenuation by the interstellar medium (ISM) obscures the line core in most stars, requiring the intrinsic Lyα flux to be reconstructed based on fits to the line wings. We present a test of the widely used Lyα emission-line reconstruction code lyapy using phase-resolved, medium-resolution STIS G140M observations of the close white dwarf–M dwarf binary EG UMa. The Doppler shifts induced by the binary orbital motion move the Lyα emi

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22

Zheng, Jianqiu, Qiong Zhang, Qiang Li, Qiang Zhang, and Ming Cai. "Contribution of sea ice albedo and insulation effects to Arctic amplification in the EC-Earth Pliocene simulation." Climate of the Past 15, no. 1 (2019): 291–305. http://dx.doi.org/10.5194/cp-15-291-2019.

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Abstract. In the present work, we simulate the Pliocene climate with the EC-Earth climate model as an equilibrium state for the current warming climate induced by rising CO2 in the atmosphere. The simulated Pliocene climate shows a strong Arctic amplification featuring pronounced warming sea surface temperature (SST) over the North Atlantic, in particular over the Greenland Sea and Baffin Bay, which is comparable to geological SST reconstructions from the Pliocene Research, Interpretation and Synoptic Mapping group (PRISM; Dowsett et al., 2016). To understand the underlying physical processes,

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23

Su, Yingna, Bernhard Kliem, Adriaan van Ballegooijen, and Edward Deluca. "Numerical simulations of the CME on 2010 April 8." Proceedings of the International Astronomical Union 8, S294 (2012): 575–76. http://dx.doi.org/10.1017/s174392131300327x.

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AbstractWe present 3D zero-beta ideal MHD simulations of the solar flare/CME event that occurred in Active Region 11060 on 2010 April 8. The initial magnetic configurations of the two simulations are stable nonlinear force-free field and unstable magnetic field models constructed by Su et al. (2011) using the flux rope insertion method. The MHD simulations confirm that the stable model relaxes to a stable equilibrium, while the unstable model erupts as a CME. Comparisons between observations and MHD simulations of the CME are also presented.

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Bisbas, T. G., A. P. Whitworth, R. Wünsch, D. A. Hubber, and S. Walch. "Radiation Driven Implosion and Triggered Star Formation." Proceedings of the International Astronomical Union 6, S270 (2010): 263–66. http://dx.doi.org/10.1017/s1743921311000482.

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AbstractWe present simulations of stable isothermal clouds exposed to ionizing radiation from a discrete external source, and identify the conditions that lead to Radiatively Driven Implosion and Star Formation. We use the Smoothed Particle Hydrodynamics code SEREN (Hubber et al. 2010) and the HEALPix-based photoionization algorithm described in Bisbas et al. (2009). We find that the incident ionizing flux is the critical parameter determining the evolution; high fluxes disperse the cloud, whereas low fluxes trigger star formation. We find a clear connection between the intensity of the incide

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25

Sullivan, Ryan C., V. Rao Kotamarthi, and Yan Feng. "Recovering Evapotranspiration Trends from Biased CMIP5 Simulations and Sensitivity to Changing Climate over North America." Journal of Hydrometeorology 20, no. 8 (2019): 1619–33. http://dx.doi.org/10.1175/jhm-d-18-0259.1.

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Abstract Future projections of evapotranspiration (ET) are of critical importance for agricultural and freshwater management and for predicting land–atmosphere feedbacks on the climate system. However, ET from phase 5 of the Coupled Model Intercomparison Project (CMIP5) simulations exhibits substantial biases, bolstering little confidence in future ET projections. Despite poor predictive skill and large bias of ET from the global climate models, the information content necessary to calculate ET offline is available in the models’ archived outputs: temperature T, water vapor pressure e, atmosph

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Luo, Jun, Lijun Xuan, and Kun Xu. "Comparison of Fifth-Order WENO Scheme and Finite Volume WENO-Gas-Kinetic Scheme for Inviscid and Viscous Flow Simulation." Communications in Computational Physics 14, no. 3 (2013): 599–620. http://dx.doi.org/10.4208/cicp.110212.021112a.

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AbstractThe development of high-order schemes has been mostly concentrated on the limiters and high-order reconstruction techniques. In this paper, the effect of the flux functions on the performance of high-order schemes will be studied. Based on the same WENO reconstruction, two schemes with different flux functions, i.e., the fifth-order WENO method and the WENO-Gas-kinetic scheme (WENO-GKS), will be compared. The fifth-order finite difference WENO-SW scheme is a characteristic variable reconstruction based method which uses the Steger-Warming flux splitting for inviscid terms, the sixth-or

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27

Cruz, Fernando, José P. Faria, Miguel Rocha, Isabel Rocha, and Oscar Dias. "A review of methods for the reconstruction and analysis of integrated genome-scale models of metabolism and regulation." Biochemical Society Transactions 48, no. 5 (2020): 1889–903. http://dx.doi.org/10.1042/bst20190840.

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The current survey aims to describe the main methodologies for extending the reconstruction and analysis of genome-scale metabolic models and phenotype simulation with Flux Balance Analysis mathematical frameworks, via the integration of Transcriptional Regulatory Networks and/or gene expression data. Although the surveyed methods are aimed at improving phenotype simulations obtained from these models, the perspective of reconstructing integrated genome-scale models of metabolism and gene expression for diverse prokaryotes is still an open challenge.

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28

Gray, M. "Reconstruction of Spectra obtained with PYTHEAS through Photometric Methods." International Astronomical Union Colloquium 149 (1995): 311–13. http://dx.doi.org/10.1017/s0252921100023228.

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PYTHEAS is an imaging spectrophotometer giving high spectral and spatial resolutions in joining together several optical concepts (Le Coarer et al 1992, and Georgelin et al. in these Proceedings). It will be shown in this paper that, contrary to other spectrographs using somewhat complex methods of data reduction, the PYTHEAS imaging spectrometer requires simple photometric methods in order to reconstruct the spectra of astrophysical objects.The CCD image of a continuous spectral energy distribution for a permanent gap between the layers of the Fabry-Perot consists in a series of channelled sp

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29

Brochard, G., J. Bao, C. Liu, et al. "Verification and validation of linear gyrokinetic and kinetic-MHD simulations for internal kink instability in DIII-D tokamak." Nuclear Fusion 62, no. 3 (2022): 036021. http://dx.doi.org/10.1088/1741-4326/ac48a6.

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Abstract Verification and linear validation of the internal kink instability in tokamak have been performed for both gyrokinetic (GTC) and kinetic-MHD codes (GAM-solver, M3D-C1-K, NOVA, XTOR-K). Using realistic magnetic geometry and plasma profiles from the same equilibrium reconstruction of the DIII-D shot #141216, these codes exhibit excellent agreement for the growth rate and mode structure of the internal kink mode when all kinetic effects are suppressed. The simulated radial mode structures, obtained from linear simulations, are in reasonable agreement with the normalised electron cyclotr

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MIYAJI, Koji, and Rei NAGASAWA. "Extension of the Flux Reconstruction Method to High-Reynolds Number RANS Simulations around High-Lift Devices." TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 60, no. 1 (2017): 18–26. http://dx.doi.org/10.2322/tjsass.60.18.

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31

Guennou, Chloé, Etienne Pariat, James E. Leake, and Nicole Vilmer. "Testing predictors of eruptivity using parametric flux emergence simulations." Journal of Space Weather and Space Climate 7 (2017): A17. http://dx.doi.org/10.1051/swsc/2017015.

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Solar flares and coronal mass ejections (CMEs) are among the most energetic events in the solar system, impacting the near-Earth environment. Flare productivity is empirically known to be correlated with the size and complexity of active regions. Several indicators, based on magnetic field data from active regions, have been tested for flare forecasting in recent years. None of these indicators, or combinations thereof, have yet demonstrated an unambiguous eruption or flare criterion. Furthermore, numerical simulations have been only barely used to test the predictability of these parameters.

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Mak, Aaron, and Mehdi Raessi. "A Machine Learning Approach to Volume Tracking in Multiphase Flow Simulations." Fluids 10, no. 2 (2025): 39. https://doi.org/10.3390/fluids10020039.

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This work presents a machine learning (ML) approach to volume-tracking for computational simulations of multiphase flow. It is an alternative to a commonly used procedure in the volume-of-fluid (VOF) method for volume tracking, in which the phase interfaces are reconstructed for flux calculation followed by volume advection. Bypassing the computationally expensive steps of interface reconstruction and flux calculation, the proposed ML approach performs volume advection in a single step, directly predicting the volume fractions at the next time step. The proposed ML function is two-dimensional

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Cornardeau, Baptiste. "Joseph Margolis et la fragilité du monde humain." Archives de Philosophie Tome 87, no. 2 (2024): 103–19. http://dx.doi.org/10.3917/aphi.872.0101.

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Hybride et émergent, artéfactuel et culturel sans cesser d’être naturel, le monde humain tel que l’entend Joseph Margolis est aussi, en cela même, dans ses différentes dimensions, un monde fragile, instable et en perpétuelle reconstruction. Les enquêtes scientifiques et philosophiques ne peuvent en effet s’affranchir d’une condition d’impermanence où le flux l’emporte sur la fixité, ni s’émanciper d’un horizon de discours symbiotique ancré dans le langage ordinaire. Métisses et solidaires d’un monde médian conversationnel, les langues humaines répondent également, dans leur indétermination mêm

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Gazith, Dotan, and Barak Zackay. "Precision Speckle Pattern Reconstruction for High-contrast Imaging." Astronomical Journal 167, no. 2 (2024): 53. http://dx.doi.org/10.3847/1538-3881/ad0b6f.

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Abstract In high-contrast imaging, a large instrumental, technological, and algorithmic effort is made to reduce residual speckle noise and improve the detection capabilities. In this work, we explore the potential of using a precise physical description of speckle images, in conjunction with the optimal detection statistic to perform high-contrast imaging. Our method uses short-exposure speckle images, reconstructing the point-spread function (PSF) of each image with phase retrieval algorithms. Using the reconstructed PSFs, we calculate the optimal detection statistic for all images. We analy

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Nagy, Melinda, Alexandre Lemerle, and Paul Charbonneau. "Impact of nonlinear surface inflows into activity belts on the solar dynamo." Journal of Space Weather and Space Climate 10 (2020): 62. http://dx.doi.org/10.1051/swsc/2020064.

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We examine the impact of surface inflows into activity belts on the operation of solar cycle models based on the Babcock–Leighton mechanism of poloidal field regeneration. Towards this end we introduce in the solar cycle model of Lemerle & Charbonneau (2017. ApJ 834: 133) a magnetic flux-dependent variation of the surface meridional flow based on the axisymmetric inflow parameterization developped by Jiang et al. (2010. ApJ 717: 597). The inflow dependence on emerging magnetic flux thus introduces a bona fide nonlinear backreaction mechanism in the dynamo loop. For solar-like inflow speeds

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Ekama, G. A., and P. Marais. "Comparison of the 1D flux theory with a 2D hydrodynamic secondary settling tank model." Water Science and Technology 50, no. 7 (2004): 195–204. http://dx.doi.org/10.2166/wst.2004.0454.

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The applicability of the 1D idealized flux theory (1DFT) for design of secondary settling tanks (SSTs) is evaluated by comparing its predicted maximum surface overflow (SOR) and solids loading (SLR) rates with that calculated from the 2D hydrodynamic model SettlerCAD using as a basis 35 full scale SST tress tests conducted on different SSTs with diameters from 30 to 45m and 2.25 to 4.1m side water depth, with and without Stamford baffles. From the simulations, a relatively consistent pattern appeared, i.e. that the 1DFT can be used for design but its predicted maximum SLR needs to be reduced b

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Ma, Libin, Chao Yan, and Jian Yu. "A Modal-Decay-Based Shock-Capturing Approach for High-Order Flux Reconstruction Method." Aerospace 10, no. 1 (2022): 14. http://dx.doi.org/10.3390/aerospace10010014.

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The increasing demand for high-fidelity simulations of compressible turbulence on complex geometries poses a number of challenges for numerical schemes, and plenty of high-order methods have been developed. The high-order methods may encounter spurious oscillations or even blow up for strongly compressible flows, and a number of approaches have been developed, such as slope limiters and artificial viscosity models. In the family of artificial viscosity, which measures smoothness using the modal coefficients, the averaged modal decay (MDA) model employs all of the modes instead of only the high

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Qin, G., F. J. Kong, and S. S. Wu. "The Efficiency of Electron Acceleration by ICME-driven Shocks." Astrophysical Journal 942, no. 2 (2023): 63. http://dx.doi.org/10.3847/1538-4357/aca60e.

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Abstract We present a study of the efficiency of the acceleration of suprathermal electrons at collisionless shock waves driven by interplanetary coronal mass ejections (ICMEs), with the data analysis from both the spacecraft observations and test-particle simulations. The observations are from the 3DP/EESA instrument on board Wind during the 74 shock events listed in Yang et al., and the test-particle simulations are carried out through 315 cases with different shock parameters. A total of seven energy channels ranging from 0.428–4.161 keV are selected. In the simulations, using a backward-in

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Dupuy, A., O. Banton, and M. Razack. "Contamination nitratée des eaux souterraines d'un bassin versant agricole hétérogène: 1. Évaluation des apports à la nappe (modèle Agriflux)." Revue des sciences de l'eau 10, no. 1 (2005): 23–40. http://dx.doi.org/10.7202/705268ar.

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Au cours des dernières décennies, la hausse de la productivité agricole s'est accompagnée d'une forte augmentation des fertilisations azotées qui a entraîné l'augmentation des concentrations en nitrates dans les eaux souterraines. Récemment, les études sur la gestion des pollutions diffuses agricoles ont intégré l'échelle du bassin versant hydrologique. Dans cet article, une approche basée sur un découpage en secteurs pédologiquement et agronomiquement homogènes a été élaborée pour permettre l'utilisation d'un modèle d'évaluation (AgriFlux), et obtenir les flux d'eau et de nitrates sortant de

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Becquart, C. S., P. C. Clapp, and J. A. Rifkin. "Molecular dynamics simulations of surface reconstruction at the edges of a crack in ruthenium aluminum." Journal of Materials Research 9, no. 3 (1994): 548–52. http://dx.doi.org/10.1557/jmr.1994.0548.

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Using molecular dynamics computer simulations and interatomic potentials derived partly by Voter and Chen1 and Rifkin et al.,2 we studied the surface reconstruction taking place on free surfaces of arrays of RuAl. Surface reconstruction appears to be very important on {111} and {110} types of planes and almost nonexistent on {100} type of planes. Cracks oriented so that their crack planes were either {111} types or {110} types exhibit on their internal free surface important surface reconstruction. It is believed that this effect may have some contribution in the brittle versus ductile behavio

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Jung, Chunyong, and Gary M. Lackmann. "The Response of Extratropical Transition of Tropical Cyclones to Climate Change: Quasi-Idealized Numerical Experiments." Journal of Climate 34, no. 11 (2021): 4361–81. http://dx.doi.org/10.1175/jcli-d-20-0543.1.

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AbstractThis study uses small ensembles of convection-allowing, quasi-idealized simulations to examine the response of North Atlantic tropical cyclones (TCs) undergoing extratropical transition (ET) to climate change. Using HURDAT2 and ERA5 data over a 40-yr period from 1979 to 2018, we developed storm-relative composite fields for past North Atlantic recurving, oceanic ET events. The quasi-idealized present-day simulations are initialized from these composites and run in an aquaplanet domain. A pseudo–global warming approach is used for future simulations: Thermodynamic changes between late t

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Kovbasa, S., S. Dymko, and M. Zhelinskyi. "SPEED OBSERVER FOR SENSORLESS ENERGY GENERATION SYSTEMS BASED ON FIELD ORIENTED INDUCTION GENERATOR." ELECTRICAL AND COMPUTER SYSTEMS 33, no. 108 (2020): 9–15. http://dx.doi.org/10.15276/eltecs.32.108.2020.1.

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The paper presents a novel adaptive speed – rotor flux linkage observer for sensorless field oriented control of induction generators. The proposed solution is based on Matsuse observer structure to- gether with specially designed correction terms and utilize current measurement and calculated stator volt- ages for real-time flux and speed reconstruction. A special coordinate transformation is used to avoid non- linear parametrization in the right side of flux linkages differential equations. Adaptive observer is designed in two steps: at the first step nonadaptive flux linkage observer is des

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Spring, Aaron, István Dunkl, Hongmei Li, Victor Brovkin, and Tatiana Ilyina. "Trivial improvements in predictive skill due to direct reconstruction of the global carbon cycle." Earth System Dynamics 12, no. 4 (2021): 1139–67. http://dx.doi.org/10.5194/esd-12-1139-2021.

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Abstract. State-of-the art climate prediction systems have recently included a carbon component. While physical-state variables are assimilated in reconstruction simulations, land and ocean biogeochemical state variables adjust to the state acquired through this assimilation indirectly instead of being assimilated themselves. In the absence of comprehensive biogeochemical reanalysis products, such an approach is pragmatic. Here we evaluate a potential advantage of having perfect carbon cycle observational products to be used for direct carbon cycle reconstruction. Within an idealized perfect-m

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Nameche, T., and J. L. Vassel. "Bilan thermique sous climat tempéré des lagunes aérées et naturelles." Revue des sciences de l'eau 12, no. 1 (2005): 65–91. http://dx.doi.org/10.7202/705344ar.

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Un modèle décrivant la température d'équilibre des lagunes a été développé, tenant compte des différents flux de chaleur que celles-ci échangent avec l'air et le sol environnant. Six composantes différentes ont été inclues dans le calcul de ce bilan thermique: radiation solaire, évaporation, convection, rayonnement atmosphérique, rayonnement de la surface du plan d'eau, échange via les parois en contact avec le sol. Le modèle ainsi obtenu a été testé avec efficacité sur deux lagunes aérées et une lagune naturelle situées sous climat tempéré ; sa précision sur l'estimation des températures d'éq

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Čemeljić, Miljenko, Hai Yang, Feng Yuan, and Hsien Shang. "Formation of Episodic Jets and Associated Flares from Black Hole Accretion Systems." Astrophysical Journal 933, no. 1 (2022): 55. http://dx.doi.org/10.3847/1538-4357/ac70cc.

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Abstract Episodic ejections of blobs (episodic jets) are widely observed in black hole sources and usually associated with flares. In this paper, by performing and analyzing three-dimensional general relativity magnetohydrodynamical numerical simulations of accretion flows, we investigate their physical mechanisms. We find that magnetic reconnection occurs in the accretion flow, likely due to the turbulent motion and differential rotation of the accretion flow, resulting in flares and formation of flux ropes. Flux ropes formed inside of 10–15 gravitational radii are found to mainly stay within

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Zhao, Yiqing, Ke Lan, Peng Song, Wudi Zheng, and Xin Li. "A method to determine the flux limiter via the motion of the M-band emission region in Au hohlraum." Laser and Particle Beams 30, no. 3 (2012): 387–96. http://dx.doi.org/10.1017/s0263034612000225.

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AbstractIn this paper, the influence of the electron flux limiter fe on hohlraum plasmas is studied by using the two-dimensional code LARED-H, and a method to experimentally determine fe via the motion of the M-band emission region in Au hohlraum is proposed. From our simulations, the limited free streaming flux may dominates the heat conduction in the regions with steep temperature gradient, including the laser deposition region, the flux-heated overcritical region, and the laser channel boundary between the hot laser plasmas and the surrounding radiation ablated plasmas, while these are impo

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TAN, X., J. X. ZHONG, and G. W. YANG. "GROWTH MECHANISM OF RING SHAPED NANOSTRUCTURES SELF-ASSEMBLY UPON DROPLET EPITAXY." Surface Review and Letters 19, no. 03 (2012): 1250029. http://dx.doi.org/10.1142/s0218625x12500291.

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A quantitatively kinetic model has been established to address the self-assembly of the ring shaped nanostructures upon the droplet epitaxy via kinetic Monte Carlo simulations. The theoretical predictions about the temperature and As flux dependences of the self-assembly of the ring shaped nanostructures were in well agreement with recent experiments. It was found that the morphological evolution of the ring shaped nanostructures was attributed to the cooperation of the enhanced diffusion barriers of free Ga atoms in the inner ring region and the effects of the surface reconstruction around th

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Jung, Chunyong, and Gary M. Lackmann. "Extratropical Transition of Hurricane Irene (2011) in a Changing Climate." Journal of Climate 32, no. 15 (2019): 4847–71. http://dx.doi.org/10.1175/jcli-d-18-0558.1.

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Abstract Tropical cyclones (TCs) undergoing strong extratropical transition (ET) can produce adverse societal impacts in areas that rarely experience direct TC impacts. This, in conjunction with projected environmental changes in climatological ET regions, motivates the investigation of possible future changes in ET characteristics. We utilize a small ensemble of numerical model simulations to examine how warming affects the ET of Hurricane Irene. To assess the effects of climate change, we use the pseudo-global warming method in which thermodynamic changes, derived from an ensemble of 20 CMIP

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Frasson, Thomas, Stéphane Labrosse, Henri-Claude Nataf, Nicolas Coltice, and Nicolas Flament. "On the impact of true polar wander on heat flux patterns at the core–mantle boundary." Solid Earth 15, no. 5 (2024): 617–37. http://dx.doi.org/10.5194/se-15-617-2024.

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Abstract. The heat flux across the core–mantle boundary (CMB) is a fundamental variable for Earth evolution and internal dynamics. Seismic tomography provides access to seismic heterogeneities in the lower mantle, which can be related to present-day thermal heterogeneities. Alternatively, mantle convection models can be used to either infer past CMB heat flux or to produce statistically realistic CMB heat flux patterns in self-consistent models. Mantle dynamics modifies the inertia tensor of the Earth, which implies a rotation of the Earth with respect to its spin axis, a phenomenon called tru

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Shukhtina, M. A., and E. Gordeev. "In situ magnetotail magnetic flux calculation." Annales Geophysicae 33, no. 6 (2015): 769–81. http://dx.doi.org/10.5194/angeo-33-769-2015.

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Abstract. We explore two new modifications of the magnetotail magnetic flux (F) calculation algorithm based on the Petrinec and Russell (1996) (PR96) approach of the tail radius determination. Unlike in the PR96 model, the tail radius value is calculated at each time step based on simultaneous magnetotail and solar wind observations. Our former algorithm, described in Shukhtina et al. (2009), required that the "tail approximation" requirement were fulfilled, i.e., it could be applied only tailward x ∼ −15 RE. The new modifications take into account the approximate uniformity of the magnetic fi

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