Article
Environmental Sciences
Jianwei Zhang, Bingpeng Wang, Qi Jiang, Ge Hou, Zhirui Li, Hongze Liu
Summary: This paper investigates the fluid-solid interaction problem involving structural movement and deformation. It proposes an SPH interaction method to establish a numerical fluid-solid model. The method demonstrates good accuracy by comparing with experimental results.
Article
Engineering, Marine
Ada Yilmaz, Selahattin Kocaman, Mustafa Demirci
Summary: This paper introduces a newly-designed experimental setup to study the interaction between an elastic sluice gate and a dam-break flow, the phenomenon was analyzed through experimental measurements and numerical modeling.
Article
Computer Science, Interdisciplinary Applications
Yan Zhang, Liqun Lyu, Peng Li
Summary: Debris flows are a common geological hazard that cause severe damage to buildings and humans. This study developed a numerical method to simulate the movement of debris flows and validated the method using indoor experimental data. The proposed method is significant for the three-dimensional simulation of large-scale debris flows.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Marine
J. Zhao, R. C. Zhu, W. J. Zhou
Summary: An efficient velocity decomposition method for simulating free surface flows on the OpenFOAM platform has been proposed, which treats the free surface as a source region and models it using the volume-of-fluid method. The method shows similar accuracy to traditional CFD methods but with lower sensitivity to domain size.
Article
Computer Science, Interdisciplinary Applications
Declan B. Gaylo, Kelli Hendrickson, Dick K. P. Yue
Summary: We have developed a robust framework for tracking the volume transfer between bubbles/droplets and validated its effectiveness through numerical simulations.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Environmental Sciences
F. Salmasi, J. Abraham
Summary: This study investigates the head loss (ΔE) and discharge coefficients (Cd) of sluice gates using scaled experimentation. The results show that ΔE is greater for free flow conditions compared to submerged flow conditions, and the discharge coefficients are also higher in free flow. The relative energy losses have a range of 0.271 to 0.604, indicating that these high energy losses should be considered in the design of intake structures and canal systems.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Behzad Shakouri, Imren Ismail, Mir Jafar Sadegh Safari
Summary: In this study, a new method for determining the flow discharge of vertical sluice gates is proposed using energy-momentum equations to characterize the physical expression of the phenomena. The coefficient of discharge, contraction coefficient, and energy loss coefficient are calculated using an optimization approach. Regression equations for quantifying the energy loss coefficient are produced using symbolic regression method. The derived formulas are used to compute the discharge coefficient and flow discharge of the vertical sluice gate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Computer Science, Interdisciplinary Applications
Niklas Kuehl, Jorn Kroeger, Martin Siebenborn, Michael Hinze, Thomas Rung
Summary: This paper studies the adjoint complement to the VoF method for immiscible two-phase flows, deriving the continuous adjoint two-phase system and dual compressive convection schemes for prominent compressive convection schemes. The paper also presents numerical results and discusses the influence of modifications on sensitivities for practical flow cases, showing the importance of regularization in the adjoint system for accurate solutions.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Xiaohui Yan, Yan Wang, Boyuan Fan, Abdolmajid Mohammadian, Jianwei Liu, Zuhao Zhu
Summary: Predicting the flow field around sluice gates is crucial for controlling water levels and discharges. This study proposes a CNN to predict the flow field, which reduces computational costs while accurately reproducing sluice gate flows. The developed CNN outperforms traditional data-driven algorithms in predicting sluice gate flows, making it a promising tool for rapid prediction of flow fields and other hydrologic variables.
JOURNAL OF HYDROINFORMATICS
(2023)
Article
Engineering, Mechanical
Shinjan Ghosh, Ryan Wardell, Sudeepta Mondal, Erik Fernandez, Asok Ray, Jayanta Kapat
Summary: This study used a topology optimization method to optimize the shape of U-bend in serpentine channels, aiming to reduce pressure drop. Experimental and computational results showed that the topology optimization achieved a higher reduction in pressure drop compared to the benchmark U-bend and surrogate model-based Bayesian optimization.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Chemical
Haiwen Zhu, Jianjun Zhu, Hong-Quan Zhang
Summary: The performance of widely used Electrical Submersible Pump (ESP) is significantly affected by gas entrainment, and an accurate ESP model is necessary to help design and operate the ESP system under gassy flow conditions.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Margaritis Kostoglou, Alexandra Moschona, Anastasios J. Karabelas, Dimitrios C. Sioutopoulos
Summary: Proper characterization of fluid mechanics is crucial for optimizing the design and operation of haemo-catharsis (HC) modules. A newly developed methodology allows for the determination of significant pressure losses in the headers of HC-modules, particularly in counter-current flow situations. This methodology provides a reliable prediction of key process variables and is recommended for practical applications.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Computer Science, Interdisciplinary Applications
Ashish Pathak, Wen Jin, Mehdi Raessi
Summary: We propose a novel three-dimensional numerical scheme for modeling discontinuous contact line pinning along sharp straight edges. The scheme, based on the Volume-of-Fluid (VOF) method, utilizes a Piecewise-Linear-Interface-Construction (PLIC) approach to adjust the orientation of polygons near the sharp edge. By solving a root-finding problem and using a 3D geometrical toolbox, the scheme accurately captures the pinning effects and improves simulation results.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Engineering, Marine
Xiangheng Feng, Yonggang Lin, Yajing Gu, Danyang Li, Bowen Chen, Hongwei Liu, Yong Sun
Summary: Platform motions induced by wind and waves have a strong nonlinear coupling effect on the aerodynamic characteristics of floating offshore wind turbines, which worsens the power instability of the turbine and should be considered in the early design stage. This study proposed a platform motion-based method to estimate power stability and successfully applied it to the preliminary stability design. A high-fidelity computational fluid dynamics model was established for a 10 MW wind turbine using oversetting grid and superposition motion technology. The influence of platform surge and pitch motions on the power characteristics of the turbine was summarized, and a semi-submersible platform structure was designed to support the turbine based on hydrodynamic analysis.
Article
Engineering, Civil
Farzin Salmasi, John Abraham
Summary: This study investigates the effect of different sill shapes on the discharge coefficient C-d under a vertical sluice gate. Results show that circular sills can increase C-d, with the highest values observed in a 3 cm diameter circular sill. Sill height and shape significantly impact C-d, while the most influential parameters are H-1/p and Z/G.
JOURNAL OF HYDROLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Veysel Gumus
METEOROLOGICAL APPLICATIONS
(2019)
Article
Engineering, Multidisciplinary
N. Goksu Soydan Oksal, M. Sami Akoz, Oguz Simsek
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2020)
Article
Geosciences, Multidisciplinary
Veysel Gumus, Oguz Simsek, Yavuz Avsaroglu, Berivan Agun
Summary: The study analyzed drought conditions in the Southeastern Anatolia Project (GAP) region in Turkey using data from 15 stations. It found decreasing drought trends in most areas across different time scales, with more significant trends observed in the north and south of the region.
Article
Computer Science, Artificial Intelligence
Erdal Uncuoglu, Hatice Citakoglu, Levent Latifoglu, Savas Bayram, Mustafa Laman, Mucella Ilkentapar, A. Alper Oner
Summary: In this study, six machine learning methods were investigated in three different civil engineering problems, with ANN and MGGP models showing the most successful estimations for various problems. Through evaluation criteria and model performance assessments, the study provided insights into the effectiveness of different ML models across a range of engineering problems.
APPLIED SOFT COMPUTING
(2022)
Article
Meteorology & Atmospheric Sciences
Yavuz Avsaroglu, Veysel Gumus
Summary: Drought research is challenging due to the interrelationships between different components of drought. This study utilized Copula functions for hydrological drought analysis in the Tigris Basin, Turkey, and identified the best representing Copula function. The results revealed high drought risk in the central and western parts of the basin.
METEOROLOGY AND ATMOSPHERIC PHYSICS
(2022)
Article
Meteorology & Atmospheric Sciences
Mehmet Seker, Veysel Gumus
Summary: This study uses global circulation models to make future projections of precipitation and temperature in the Mediterranean region. The Multi-Model Ensembles (MME) outperform individual models in simulating historical data. The projections show a potential decrease in precipitation and an increase in temperature, with the coastal areas experiencing more significant changes in precipitation and the high altitude areas experiencing more noticeable temperature increases.
ATMOSPHERIC RESEARCH
(2022)
Article
Meteorology & Atmospheric Sciences
Veysel Gumus, Oguz Simsek, Yavuz Avsaroglu
Summary: This study examines the monthly mean streamflow trends in Turkey's Mediterranean basins using different methods and finds that the innovative ITST and IPTA methods are more sensitive in determining significant trends. The results show a more significant decrease in streamflow in the eastern part of the basin, which is important for water resource planning in the region.
THEORETICAL AND APPLIED CLIMATOLOGY
(2023)
Article
Geochemistry & Geophysics
Veysel Gumus, Oguz Simsek, Mohammed Seaid
Summary: The wind has significant effects on the ecosystem and evaporation, and determining historical changes in wind is important for understanding these effects. This study analyzed monthly surface wind speed data from 1970 to 2021 from 199 meteorology observation stations in Turkey using the Mann-Kendall test and Sen's slope method. The results show a decreasing trend in wind speed for most stations in Turkey, indicating a change in the trend structure compared to previous studies.
Article
Computer Science, Artificial Intelligence
Oguz Simsek, Veysel Gumus, Abdulkadir Ozluk
Summary: This study investigates the flow properties of trapezoidal broad-crested weirs using experimental measurements and numerical modeling. The results show that the Froude number in the upstream region significantly affects the accuracy of estimating the discharge coefficient (C-d) values, and the artificial neural network method is more successful in determining C-d values compared to other methods.
NEURAL COMPUTING & APPLICATIONS
(2023)
Article
Meteorology & Atmospheric Sciences
Veysel Gumus, Yavuz Avsaroglu, Oguz Simsek, Ahmet Basak
Summary: This study evaluates the hydrological drought of the Orontes River Basin in Turkey's Eastern Mediterranean region using the streamflow drought index (SDI) method. The results show that the duration, severity, and peak of drought are significantly higher in the third period compared to other periods. The severity of drought in the region has increased significantly in the third period.
THEORETICAL AND APPLIED CLIMATOLOGY
(2023)
Article
Geochemistry & Geophysics
Oguz Simsek, Songul Yildiz-Bozkurt, Veysel Gumus
Summary: In this study, the meteorological drought in the Black Sea region of northern Turkey is evaluated using the SPI and RDI methods. The study finds a high probability of drought occurrence, and the occurrence of extreme drought increases with the increase in time scale.
Article
Meteorology & Atmospheric Sciences
Veysel Gumus, Nabil El Mocayd, Mehmet Seker, Mohammed Seaid
Summary: This study uses artificial neural network based downscaling approach to simulate regional climate in Morocco and investigate the impact of climate change. Results show a significant increase in minimum and maximum temperatures and a decrease in precipitation, indicating the country will likely experience more droughts in the future.
ATMOSPHERIC RESEARCH
(2023)
Article
Geochemistry & Geophysics
Veysel Gumus, Yavuz Avsaroglu, Oguz Simsek, Latif Dogan Dinsever
Summary: This study analyzes the trends of six climatic variables in the Southeastern Anatolia Region, Turkey, from 1966 to 2020. The temperatures show increasing trends according to both methods. The MK test identifies significant trends for precipitation, relative humidity, and wind speed at a limited number of stations, while the ITA method reveals consistent decreasing trends at most stations.
Article
Engineering, Civil
Veysel Gumus
Summary: Drought indices are widely used for drought monitoring, and this study compares two methods for determining drought characteristics in different regions of Turkey, finding significant differences between the two methods after the 1990s.
JOURNAL OF HYDROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Veysel Gumus, Yavuz Avsaroglu, Oguz Simsek
Summary: This study determines the trends of streamflow values in the Tigris basin, Turkey, using the Mann-Kendall test and innovative trend analysis method. The results show a significant decrease in streamflow in most of the gauge stations, particularly in the middle region of the basin.
JOURNAL OF EARTH SYSTEM SCIENCE
(2022)