Author
Eslam Gabreil
Bio: Eslam Gabreil is an academic researcher from University of Sheffield. The author has contributed to research in topics: Smoothed-particle hydrodynamics & Free surface. The author has an hindex of 1, co-authored 3 publications receiving 13 citations.
Topics: Smoothed-particle hydrodynamics, Free surface, Turbulence, Drag, Geology
Papers
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TL;DR: In this paper, the smoothed particle hydrodynamics method is used to simulate experimental shallow free surface turbulent flows over a rough bed made of regularly packed uniform spheres, and the numeri...
Abstract: In this paper, the smoothed particle hydrodynamics method is used to simulate experimental shallow free surface turbulent flows over a rough bed made of regularly packed uniform spheres. The numeri...
14 citations
TL;DR: In this article , a 3D numerical model based on the smoothed particle hydrodynamics (SPH) approach was developed to simulate the near-shore current flows over a rough topographic surface in the coastal area, where the flows are shallow and demonstrate strong turbulent characteristics.
Abstract: In this study, a three-dimensional (3D) numerical model based on the smoothed particle hydrodynamics (SPH) approach was developed to simulate the near-shore current flows over a rough topographic surface in the coastal area, where the flows are shallow and demonstrate strong turbulent characteristics. The numerical program is based on the open-source code SPHysics (http://www.sphysics.org), and two major improvements are made to treat the turbulence and rough boundary effects: A modified sub-particle-scale (SPS) eddy viscosity model is developed to address the turbulence transfer of flows, and a drag force equation is included in the momentum equations to account for the influence of roughness element on the bed and lateral boundaries. The computed results of flow velocity, shear stress, and free surface characteristics are compared with the laboratory measurements for a variety of test conditions. It has shown that the present SPH model can accurately simulate 3D-free surface near-shore current flows over a realistic topography with roughness.
7 citations
01 Jun 2018
TL;DR: In this paper, a fully 3D numerical model based on the Smoothed Particle Hydrodynamics (SPH) approach has been developed to simulate turbulent open channel flows over a fixed rough bed.
Abstract: In this study, a fully 3D numerical model based on the Smoothed Particle Hydrodynamics (SPH) approach has been developed to simulate turbulent open channel flows over a fixed rough bed. The model f...
1 citations
12 Aug 2014
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Book•
01 Jan 1993
TL;DR: Part I presents the statistical theory of turbulence, and Part 2 the coherent structures in open-channel flows and boundary layers.
Abstract: Part I presents the statistical theory of turbulence, and Part 2 the coherent structures in open-channel flows and boundary layers. The book is intended for advanced students and researchers in hydraulic research, fluid mechanics, environmental sciences and related disciplines. References Index.
371 citations
TL;DR: In this paper, a laboratory and numerical investigation on the features of the horizontal and vertical hydrodynamic loads given by a solitary wave on a submerged square barrier is presented, where the wave forces were deduced from the records of a discrete battery of pressure sensors located along the external surface of the barrier.
Abstract: A laboratory and numerical investigation on the features of the horizontal and vertical hydrodynamic loads given by a solitary wave on a submerged square barrier is presented. By the experimental viewpoint, the wave forces were deduced from the records of a discrete battery of pressure sensors located along the external surface of the barrier. As regards the numerical viewpoint, simulations were performed through the SPH model presented in Di Mascio et al. (2017), in which the governing equations are written considering a turbulence closure model. The numerical simulations allowed to extend the range of analyzed cases and highlighted the regions around the submerged barrier of higher dissipation occurring during the wave-structure interaction. A good agreement between the experimental and numerical peaks of the horizontal and vertical forces was found. Afterwards, a semi-analytical scheme able to determine the horizontal loads was adopted using the speed drop factor obtained by physical tests and simulations. For practical purposes, attention was finally paid to determine the critical conditions against the sliding of the barrier.
18 citations
TL;DR: In this article, the free surface behavior of gravity-driven shallow turbulent flows has been studied and the free-surface behavior of shallow turbulent flow has been observed in the last two decades.
Abstract: Over the last two decades, interest in the free-surface behaviour of gravity-driven shallow turbulent flows has increased considerably. It is believed that observation of free-surface behaviour can...
17 citations
TL;DR: In this article, the improved meshless local Petrov Galerkin method with Rankine source for wave interaction with vegetation model is presented, which is based on the unified governing equation, incorporating both pure fluid and vegetation regions.
Abstract: This paper presents the application of Improved Meshless Local Petrov Galerkin method with Rankine source for wave interaction with vegetation model. The mathematical model is based on the unified governing equation, incorporating both pure fluid and vegetation regions. The governing equation consists of additional force terms such as the resistance given by vegetation. This additional force term derived from Morison's equation, where the vegetation is assumed to be a series of cylinders or strips. The drag force term for strip/square type vegetation is reported in the present study. The interface between fluid and vegetation region has a smooth variation of porous rate using transition zone to avoid discontinuity. The model is validated using the available experimental results. The validated model is applied for finding out the effective shape of vegetation and the influence of vegetation patch in dissipating the wave energy from solitary waves.
13 citations
TL;DR: In this article , a 3D numerical model based on the smoothed particle hydrodynamics (SPH) approach was developed to simulate the near-shore current flows over a rough topographic surface in the coastal area, where the flows are shallow and demonstrate strong turbulent characteristics.
Abstract: In this study, a three-dimensional (3D) numerical model based on the smoothed particle hydrodynamics (SPH) approach was developed to simulate the near-shore current flows over a rough topographic surface in the coastal area, where the flows are shallow and demonstrate strong turbulent characteristics. The numerical program is based on the open-source code SPHysics (http://www.sphysics.org), and two major improvements are made to treat the turbulence and rough boundary effects: A modified sub-particle-scale (SPS) eddy viscosity model is developed to address the turbulence transfer of flows, and a drag force equation is included in the momentum equations to account for the influence of roughness element on the bed and lateral boundaries. The computed results of flow velocity, shear stress, and free surface characteristics are compared with the laboratory measurements for a variety of test conditions. It has shown that the present SPH model can accurately simulate 3D-free surface near-shore current flows over a realistic topography with roughness.
7 citations