Article
Environmental Sciences
Giuseppe Francesco Cesare Lama, Matteo Rillo Migliorini Giovannini, Alessandro Errico, Sajjad Mirzaei, Roberta Padulano, Giovanni Battista Chirico, Federico Preti
Summary: This study evaluated the hydraulic efficiency of two green-blue scenarios for reducing flood hazards in an urban area intersected by a vegetated river. It was found that the first scenario, which involved a diffuse effect of flood peak reduction along the river, was a valuable alternative to the more impacting second scenario due to the presence of flood control areas.
Article
Thermodynamics
Arnau Pons, Swanand Sardeshmukh, William E. Anderson
Summary: This study analyzes the pressure response to an unsteady heat release source in an unconfined one-dimensional domain. The analytical model predicts two pressure response regimes based on the Helmholtz number, with a critical number dictating the transition between the two regimes. The results are representative of extreme conditions in a rocket combustor and show good agreement between analytical models and numerical simulations, with slight differences attributed to neglected flow property variations and loss mechanisms.
COMBUSTION AND FLAME
(2021)
Article
Engineering, Marine
Samuel T. Bush, Kendra M. Dresback, Christine M. Szpilka, Randall L. Kolar
Summary: This research develops and compares an ADCIRC and ADCIRC/HEC-RAS paired model for compound flood modeling in North Carolina's Tar River and Pamlico Sound basins. The study investigates the ability of each model to accurately and quickly simulate flooding in a riverine/estuarine system, with potential valuable references for forecasters and model developers. The results provide information for the possible development of similar paired models for coastal river systems across the US and contribute to understanding each model's performance in riverine and estuarine areas.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Mathematics
Abey Sherif Kelil, Appanah Rao Appadu
Summary: The KdV equation is important in describing various physical phenomena. In this paper, we solve 1D and 2D KdV equations with homogeneous and non-homogeneous source terms using variational homotopy perturbation method and classical finite-difference method. We compare the performance of these methods by computing absolute and relative errors at different time scales. We also analyze the stability and consistency of the finite difference scheme. Additionally, we point out the potential application of these methods for fractional and stochastic KdV type equations and their variants.
Article
Thermodynamics
Jiangong Pan, Haiyan Su, Xinlong Feng
Summary: Two categories of efficient decoupled methods for the unsteady incompressible natural convection equations are presented and analyzed in this article. The proposed methods include first order, second order standard form, and rotational form, and can be extended to any order schemes. The correctness of the theoretical analysis and the effectiveness of the given methods are verified through several numerical experiments.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Civil
Hamidreza Rahimi, Saiyu Yuan, Xiaonan Tang, Chunhui Lu, Prateek Singh, Fariba Ahmadi Dehrashid
Summary: This paper investigates the importance of natural compound channels during high flow events and the complexity of flow structure. A new method for determining the conveyance coefficient in compound channels is proposed, leading to improved accuracy in flood prediction.
WATER RESOURCES MANAGEMENT
(2022)
Article
Geosciences, Multidisciplinary
Olivier Caumont, Marc Mandement, Francois Bouttier, Judith Eeckman, Cindy Lebeaupin Brossier, Alexane Lovat, Olivier Nuissier, Olivier Laurantin
Summary: This study examines a heavy precipitation event that caused severe flash flooding in the Aude watershed in south-western France on 14 and 15 October 2018. The event displayed typical Mediterranean heavy precipitation characteristics but also some peculiarities. The research shows that the stationarity of precipitation is linked to the presence of a trough and a strong potential virtual temperature gradient near the ground.
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2021)
Article
Chemistry, Physical
Makoto Asahara, Toshihiro Iwasa, Nobuyuki Tsuboi, A. Koichi Hayashi
Summary: The aim of this study was to investigate the unsteady fluid dynamics of high-pressure hydrogen jets. Simulation results showed the formation of a highly concentrated cloud of hydrogen at the base of the jet, with observed correlation between the spatio-temporal distribution of hydrogen concentration and velocity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Vincent Delmas, Azzedine Soulaimani
Summary: This study presents the development of a multi-GPU version of a time-explicit finite volume solver for the Shallow-Water Equations on a multi-GPU architecture, utilizing MPI, CUDA-Fortran, and the METIS library. By using multiple GPUs to accelerate message passing and conducting efficiency studies, it was found that efficiencies of over 80% can be achieved.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Astronomy & Astrophysics
Veronika Witzke, Alexander I. Shapiro, Nadiia M. Kostogryz, Robert Cameron, Benjamin V. Rackham, Sara Seager, Sami K. Solanki, Yvonne C. Unruh
Summary: The study shows that current one-dimensional radiative-convective models cannot accurately reproduce the three-dimensional facular contrasts, which has significant implications for exoplanet characterization using transmission spectroscopy.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Review
Geosciences, Multidisciplinary
Kui Xu, Chenyue Wang, Lingling Bin
Summary: This article discusses the importance of flood as a major threat to human life, health, and property in the context of climate change and urbanization. It specifically focuses on compound floods in coastal areas caused by hydrological and oceanic processes, highlighting the complex disaster mechanisms and serious consequences. The article presents various research methods, including statistical and numerical models, to study the dependence and probability of flood drivers, and simulate flood inundation. It also addresses the advantages, disadvantages, and uncertainties associated with these methods. The article emphasizes the need for future investigation to consider rainfall-runoff-storm surge compound floods, the impact of climate change, and the integration of statistical and numerical models. Such research is crucial for understanding compound floods and providing effective flood management strategies in coastal areas.
Article
Engineering, Civil
Dongqin Zhang, Takeshi Ishihara
Summary: The study investigates the unsteady crosswind responses of railway vehicles induced by tornadoes using multibody dynamic simulations. It proposes a tornado-induced aerodynamic force model and validates it with experimental data. The study also examines the Uetsu line railway accident caused by tornado winds on December 25, 2005, with predicted accident scenes showing agreement with survey results, especially when considering specific tornado parameters. It systematically analyses the dynamic amplification factor (DAF) for railway vehicles in tornado winds, finding that DAF increases with decreasing passing time and can be effectively suppressed by increasing damping parameters.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Environmental Sciences
Jennifer G. Duan, Chunshui Yu, Yan Ding
Summary: This paper proposes a two-dimensional hydrodynamic and sediment transport model based on variable-density shallow-water equations (VDSWEs) and the Exner equation. The model is solved using the first-order Godunov-type finite volume method and the Harten-Lax-van Leer-Contact (HLLC) Riemann solver. The results of laboratory experiments and a field case show good agreement with measurements, demonstrating the accuracy and robustness of the model.
Article
Mathematics, Applied
Melanie Beck, Martin J. Gander, Felix Kwok
Summary: This article introduces a special numerical method called B-method for solving blow up solutions in non-linear partial differential equations. The authors construct B-methods using the variation of constants formula and splitting methods, and prove several special properties of these methods.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Mathematics, Applied
Alessandro Borri, Francesco Carravetta, Pasquale Palumbo
Summary: We focus on Taylor Series Methods (TSM) and Automatic Differentiation (AD) for the numerical solution of Ordinary Differential Equations (ODE) characterized by a vector field given by a finite composition of elementary and standard functions. We show that computational advantages are achieved if a kind of pre-processing said Exact Quadratization (EQ) is applied to the ODE before applying the TSM and the AD. In particular, when the ODE function is given by a formal polynomial (i.e. with real powers) of n variables and m monomials, the computational complexity required by our EQ based method for the calculation of the k-th order Taylor coefficient is O(k) whereas by using the existing AD methods it amounts to O(k2).
APPLIED MATHEMATICS AND COMPUTATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Francesco Macchione, Pierfranco Costabile, Carmelina Costanzo, Rosa De Santis
ENVIRONMENTAL MODELLING & SOFTWARE
(2019)
Article
Engineering, Civil
Francesco Macchione, Pierfranco Costabile, Carmelina Costanzo, Gianluca De Lorenzo
JOURNAL OF HYDROLOGY
(2019)
Article
Environmental Sciences
Pierfranco Costabile, Carmelina Costanzo, Samuele De Bartolo, Fabiola Gangi, Francesco Macchione, Giuseppe R. Tomasicchio
WATER RESOURCES RESEARCH
(2019)
Article
Engineering, Civil
Pierfranco Costabile, Carmelina Costanzo, Gianluca De Lorenzo, Francesco Macchione
JOURNAL OF HYDROLOGY
(2020)
Article
Engineering, Civil
Domenico Ferraro, Pierfranco Costabile, Carmelina Costanzo, Gabriella Petaccia, Francesco Macchione
JOURNAL OF HYDROLOGY
(2020)
Article
Environmental Sciences
Pierfranco Costabile, Carmelina Costanzo, Domenico Ferraro, Francesco Macchione, Gabriella Petaccia
Article
Environmental Sciences
Pierfranco Costabile, Carmelina Costanzo, Claudio Gandolfi, Fabiola Gangi, Daniele Masseroni
Summary: Traditionally, topographic depressions in Digital Elevation Models (DEMs) were considered as artifacts and removed completely prior to modeling. However, the effects of depression filling on river network structure and surface runoff were not clear. This study used 2D hydrodynamic modeling to evaluate these effects and found that removing depressions from DEMs is unnecessary and they should be taken into account in simulating drainage patterns and hydrologic response.
Article
Agronomy
Pierfranco Costabile, Carmelina Costanzo, Fabiola Gangi, Carlo Iapige De Gaetanie, Lorenzo Rossi, Claudio Gandolfi, Daniele Masseroni
Summary: This work presents an integrated hydrodynamic modelling framework, called IrriSurf2D, for describing the dynamics of surface irrigation. It consists of high-resolution topographic data, two-dimensional shallow water equations, and a one-dimensional Green-Ampt approach for infiltration process. The framework was validated with a real case study and demonstrated high accuracy in reproducing timing and depth of waterfront advance.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Water Resources
Luis Cea, Pierfranco Costabile
Summary: The modelling and management of flood risk in urban areas are complex global challenges, influenced by factors such as climate change, urban population growth, and densification. Increasing studies focus on the socio-economic and environmental impacts of urban flooding, aiding in the modelling and management of flood risk.
Article
Geosciences, Multidisciplinary
Francesco Macchione, Pierfranco Costabile, Carmelina Costanzo, Rosa De Santis
ITALIAN JOURNAL OF ENGINEERING GEOLOGY AND ENVIRONMENT
(2018)
Article
Mathematics, Applied
Pierfranco Costabile, Carmelina Costanzo, Francesco Macchione
APPLIED NUMERICAL MATHEMATICS
(2017)
