103 Hits in 12.8 sec

Comparison between Three Soft Computing Methods in Estimating Shear Force Carried by Walls in Rough Rectangular Channels

Hossein Bonakdari
2017 Civil Engineering Research Journal  
(GP) models was used and compared for predicting the percentage of shear force carried by walls (%SF w ) in a rectangular channel with rough boundaries.  ...  Estimation of shear stress is an important subject in hydraulic engineering, since it affects the flow structure directly.  ...  SVR is used to find a relation between the input variables Data used The data measured by Knight (1981) in rough rectangular channels were used in order to predict %SFw with the SVM model.  ... 
doi:10.19080/cerj.2017.01.555554 fatcat:6zv2kcfa4rhhljcclphhhsueta

Evaluation of the impact of channel geometry and rough elements arrangement in hydraulic jump energy dissipation via SVM

Kiyoumars Roushangar, Roghayeh Ghasempour
2018 Journal of Hydroinformatics  
The aim of this paper is to assess the effects of channel geometry and rough boundary conditions (i.e., rectangular, trapezoidal, and expanding channels with different rough elements) in predicting the  ...  Considering the rectangular and trapezoidal channels, the model with parameters Fr 1 , (h 2 À h 1 )/h 1 , W/Z led to better predictions.  ...  Bilgin () collected some experiments in a channel with smooth bed in order to investigate the distribution of shear stress for turbulent flow.  ... 
doi:10.2166/hydro.2018.028 fatcat:rwld2sv6hncntfvfzhzns55amm

Design of a new hybrid artificial neural network method based on decision trees for calculating the Froude number in rigid rectangular channels

Isa Ebtehaj, Hossein Bonakdari, Amir Hossein Zaji, Charles Hin Joo Bong, Aminuddin Ab Ghani
2016 Journal of Hydrology and Hydromechanics  
In this study, the incipient motion of sediment is estimated using three datasets from literature, including a wide range of hydraulic parameters.  ...  A vital topic regarding the optimum and economical design of rigid boundary open channels such as sewers and drainage systems is determining the movement of sediment particles.  ...  of sediment in rigid boundary channels with rectangular and V-shape bottom cross-sectional areas using two different datasets.  ... 
doi:10.1515/johh-2016-0031 fatcat:tc63phxzffh5zedfxcnytsa36e

Prediction of Hydraulic Jumps on a Triangular Bed Roughness Using Numerical Modeling and Soft Computing Methods

Mehdi Dasineh, Amir Ghaderi, Mohammad Bagherzadeh, Mohammad Ahmadi, Alban Kuriqi
2021 Mathematics  
The SVM model with a minimum of Root Mean Square Error (RMSE) and a maximum of correlation coefficient (R2), compared with GEP and RF models in the training and testing phases for predicting the sequent  ...  This study investigates the characteristics of free and submerged hydraulic jumps on the triangular bed roughness in various T/I ratios (i.e., height and distance of roughness) using CFD modeling techniques  ...  Roushangar and Ghasempour [30] predicted the hydraulic jump energy dissipation using an SVM with channel geometry and roughness boundary conditions.  ... 
doi:10.3390/math9233135 fatcat:wglxl3x3wbc3hc6y2kgi3325dy

Optimal prediction of lateral velocity distribution in compound channels

A. Zahiri, X. Tang, S. Sharifi
2017 International Journal of River Basin Management  
Lateral velocity distributions are required for solving many hydro-engineering problems such as development of stage-discharge curves and estimation of boundary shear stress distribution (Guan, 2003;  ...  Finally, the proposed optimized model has some limitations for compound channels with rectangular cross sections.  ...  where the exponents b 1 and b 2 have the following relationships with corresponding determination coefficients of R 2 =0.95 and 0.94, respectively:  ... 
doi:10.1080/15715124.2017.1280813 fatcat:2nvkz5urcbfutk2goi4e323ehe

Predicting submerged hydraulic jump characteristics using machine learning methods

Mohsen Nasrabadi, Yaser Mehri, Amin Ghassemi, Mohammad Hossein Omid
2021 Water Science and Technology : Water Supply  
In this study, after dimensional analysis, an experimental study was conducted in a rectangular flume with a length of 9 m, a width of 0.5 m and a depth of 0.45 m in a wide range of Froude numbers (Fr  ...  In these conditions, the momentum equations will not have an analytical solution and a new solution is required.  ...  Roushangar & Ghasempour (2019) assessed the effects of channel geometry and rough boundary conditions (rectangular, trapezoidal, and expanding channels with different rough elements) in predicting energy  ... 
doi:10.2166/ws.2021.168 fatcat:ejrp5fjs4fgvbmfcdjbmycavfi

Prediction of Maximum Pressure at the Roofs of Rectangular Water Tanks Subjected to Harmonic Base Excitation Using the Multi-Gene Genetic Programming Method

Iman Bahreini Toussi, Abdolmajid Mohammadian, Reza Kianoush
2021 Mathematical and Computational Applications  
In this study, an OpenFOAM numerical model that was validated by the authors in a previous study is used to simulate various tank sizes with different liquid heights.  ...  The maximum pressure in each case is recorded and made dimensionless; then, using Multi-Gene Genetic Programming (MGGP) methods, a relationship between the dimensionless maximum pressure and dimensionless  ...  [26] applied GEP to analyze shear stress distribution in circular channels with flat beds subject to sediment deposition.  ... 
doi:10.3390/mca26010006 fatcat:p6orxdg6rnc73jcued6eh2b24e

Application of the Navier-Stokes Equations to the Analysis of the Landslide Sediments Permeability and Related Seepage Effects

Meng Song, Yuncai Liu, Zhen Wang
2022 Fluid Dynamics & Materials Processing  
The magnitude of the internal flow for the whole system decreases first and then increases with a change in the water level during seepage.  ...  The purpose of the study is to implement a new model based on the Navier-Stokes equations for the characterization of landslide sediments interacting with a moving fluid.  ...  The finite difference method is used in this study.  ... 
doi:10.32604/fdmp.2022.017737 fatcat:prbqkejfkrdhzhggxxvnjycs3m

Analysis of experimentally generated friction related acoustic emission signals

Kassahun Asamene, Mannur Sundaresan
2012 Wear  
Some of techniques were so inaccurate as not to be useful: SVM with an RBF kernel function (with and without PCA), naïve Bayes with PCA, and SVM with a polynomial kernel function and PCA all had accuracies  ...  Numerical approaches such as finite difference, boundary element method, finite element method and finite integral method has been considered in deriving the AE signals this amongst others [11] [12] [  ... 
doi:10.1016/j.wear.2012.07.019 fatcat:ak2tp3bzwrgbloiofoxrgu6w2q

Optimization of Heat and Mass Exchange

Brian Agnew, Ivan CK Tam, Xiaojun Shi
2020 Processes  
The needs of society are often a driving force for engineering research [...]  ...  Acknowledgments: The authors gratefully acknowledge the support of the above fundings and the authors also thank China Scholarship Council for supporting a two-years research stay of the first author and  ...  Since a forced convection flow around a cylinder is dominated by viscous shear forces in the boundary layer and the velocity gradient between the walls is very large, so, in this paper, the shear stress  ... 
doi:10.3390/pr8030314 fatcat:xflgj34ox5dm5eucav5cm2ypey

Engineering, Technology & Applied Science Research (ETASR), Vol. 12, No. 2, pp. 8228-8481

2022 Zenodo  
Engineering, Technology & Applied Science Research (ETASR) is an international bimonthly wide scope, peer-reviewed open access journal for the publication of original articles concerned with diverse aspects  ...  ), and has been awarded a DOAJ seal.  ...  ACKNOWLEDGMENT We wish to thank the car owners who allowed us to take photos of their cars, the completion of our study would not have been possible without their support.  ... 
doi:10.5281/zenodo.6509470 fatcat:nn7pi5ec35gzplz6ewln2lbbrm

Modern Applied Science, Vol. 3, No. 12, December, 2009

Editor MAS
2009 Modern Applied Science  
the killing element or removing element method, (3) substituting the rock mass in excavating tunnels by the fixed boundary conditions, and first computing the initial stress to balance the reverse stress  ...  The sampling method is one of these methods is used widely in engineering. It uses a triangle wave as carrier generally.  ... 
doi:10.5539/mas.v3n12p0 fatcat:7mgcusxchjh3rlfwhv6xex6zqe

Engineering, Technology & Applied Science Research (ETASR), Vol. 11, No. 4, pp. 7291-7530

2021 Zenodo  
Engineering, Technology & Applied Science Research (ETASR) is an international bimonthly wide scope, peer-reviewed open access journal for the publication of original articles concerned with diverse aspects  ...  ), and has been awarded a DOAJ seal.  ...  an increase in the shear stress.  ... 
doi:10.5281/zenodo.5506592 fatcat:73sj5nawgndeffb26wh6wnux4a

Objective evaluation of vowel pronunciation

Mark J. Bakkum, Reinier Plomp, Louis C. W. Pols
1991 Journal of the Acoustical Society of America  
By using sediment velocities (estimated by an inversion method), known sediment porosity, and pure hydrate velocity, the amount of hydrate in the highest velocity and most intensively blanked sediments  ...  A common depth point (CDP} seismic reflection profile using a 240-channel, 6000-m array with a 177-liter (5-to 60-Hz) source was collected along the continental rise off the eastern U.S. where a BSR reflection  ...  Plans for the next meetings of ISO/TC43 (in Australia in December 1991 ), and for IEC/TC 29 (in New Zealand, from 25-29 November 1991 } will be discussed.  ... 
doi:10.1121/1.2029328 fatcat:qntsmkrqkjbkpaxn35nuxutuaa

Review of Physics-based and Data-driven Multiscale Simulation Methods for Computational Fluid Dynamics and Nuclear Thermal Hydraulics [article]

Arsen S. Iskhakov, Nam T. Dinh
2021 arXiv   pre-print
In this paper, the origin of the scaling gaps in computational fluid dynamics and thermal hydraulics (with an emphasis on engineering scale applications) is discussed.  ...  As a result, several different physics-based methodologies were historically suggested in an attempt to "bridge" the existing scaling gaps.  ...  They addressed this challenge by using spatially filtered DNS data and an FNN to predict wall shear stress in LES.  ... 
arXiv:2102.01159v1 fatcat:foydy65exnbonjeswdxittimie
« Previous Showing results 1 — 15 out of 103 results