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Dentale F.,University of Salerno | Dentale F.,University Consortium for Research on Major Hazards | Donnarumma G.,University of Salerno | Carratelli E.P.,University of Salerno | Carratelli E.P.,University Consortium for Research on Major Hazards
Journal of Coastal Research | Year: 2014

Dentale, F.; Donnarumma, G., and Pugliese Carratelli, E., 2014. Simulation of flow within armour blocks in a breakwater. This paper provides some results of a new procedure to analyze the hydrodynamic aspects of the interactions between maritime emerged breakwaters and waves by integrating computer-aided design and computational fluid dynamicsCFD. The structure is modeled in the numerical domain by overlapping individual three-dimensional elements (Xbloc®), very much like the real world or physical laboratory testing. A computational grid is fitted fine enough to provide enough computational nodes within the flow paths. Flow of the fluid within the interstices among concrete blocks is evaluated by integrating the Reynolds averaged Navier-Stokes equations inside the voids instead of using the "porous media" approach. The aim is to investigate the reliability of this approach as a design tool. Therefore, for the results' validation, the numerical run-up and reflection effects on virtual breakwater (armour in Xbloc, toe protection, and filter layer in stones) were compared with some empirical formulas and some similar laboratory tests. Obviously, the presented model can be supportive to the physical modeling, comparing multiple preliminary design solutions, and providing guidance on the optimal choice to be subjected to subsequent laboratory tests. Here are presented the results of a first simple validation procedure. The validation shows that, at present, this innovative approach can be used in the breakwater design phase for comparison between several design solutions with a significant minor cost. © Coastal Education & Research Foundation 2014. Source


Dentale F.,University of Salerno | Dentale F.,University Consortium for Research on Major Hazards | Donnarumma G.,University of Salerno | Carratelli E.P.,University of Salerno | Carratelli E.P.,University Consortium for Research on Major Hazards
International Journal of Naval Architecture and Ocean Engineering | Year: 2014

The paper provides some results of a new procedure to analyze the hydrodynamic aspects of the interactions between maritime emerged breakwaters and waves by integrating CAD and CFD. The structure is modeled in the numerical domain by overlapping individual three-dimensional elements (Tetrapods), very much like the real world or physical laboratory testing. Flow of the fluid within the interstices among concrete blocks is evaluated by integrating the RANS equations. The aim is to investigate the reliability of this approach as a design tool. Therefore, for the results' validation, the numerical run-up and reflection effects on virtual breakwater were compared with some empirical formulae and some similar laboratory tests. Here are presented the results of a first simple validation procedure. The validation shows that, at present, this innovative approach can be used in the breakwater design phase for comparison between several design solutions with a significant minor cost. © 2014, Society of Naval Architects of Korea. All rights reserved. Source


Dentale F.,University of Salerno | Dentale F.,University Consortium for Research on Major Hazards | Donnarumma G.,University of Salerno | Carratelli E.P.,University of Salerno | Carratelli E.P.,University Consortium for Research on Major Hazards
Coasts, Marine Structures and Breakwaters 2013: From Sea to Shore - Meeting the Challenges of the Sea | Year: 2014

From the numerical point of view, the complexity of the fluid dynamic processes involved has so far hindered the direct application of Navier-Stokes equations within the armour blocks, due to the complex geometry and the presence of strongly non stationary flows, free boundaries and turbulence. In the present work the most recent CFD technology is used to provide a new and more reliable approach to the design analysis of breakwaters, especially in connection with run-up and overtopping. The solid structure is simulated within the numerical domain by overlapping individual virtual elements to form the empty spaces delimited by the blocks. Thus, by defining a fine computational grid, an adequate number of nodes is located within the interstices and a complete solution of the full hydrodynamic equations is carried out. In the work presented here the numerical simulations are carried out by integrating the three-dimensional Reynolds Average Navier-Stokes Equations coupled with the RNG turbulence model and a Volume of Fluid Method used to handle the dynamics of the free surface. The aim is to investigate the reliability of this approach as a design tool. Therefore, for the results' validation, the numerical run-up and reflection effects on virtual breakwater (Armour in Accropode™, toe protection and filter layer in stones) were compared with some empirical formulae and some similar laboratory tests. While for overtopping two different breakwaters are considered, real structures both located in Sicily: one a typical quarry stone breakwater, another a more complex design incorporating a spill basin and an armoured layer made up by CORE-LOC™ blocks. The results of this approach are good but, at present, this numerical approach can be used to support to the physical tests in a preliminary design phase in order to comparisons between several project solutions with significant minor cost. © Thomas Telford Limited 2014. Source


Dentale F.,University of Salerno | Dentale F.,University Consortium for Research on Major Hazards | Donnarumma G.,University of Salerno | Carratelli E.P.,University of Salerno | And 3 more authors.
WSEAS Transactions on Fluid Mechanics | Year: 2015

The paper provides some results of a new procedure, developed by MEDUS, to analyze the hydrodynamic aspects of the interactions between maritime emerged breakwaters and waves, by integrating CAD and CFD software.The filtration of the fluid within the interstices of a concrete blocks breakwater is evaluated by integrating the Reynolds Averaged Navier-Stokes equations (RANS) inside the voids rather than making use of the widespread “porous media” approach. The structure is thus modelled, very much like in the real world or in the physical laboratory testing, by overlapping individual three-dimensional elements (Armour in Accropode™, Core-loc™ or Xbloc®, toe protection and filter layer in stones), and then the computational grid is fitted so as to provide enough computational nodes within the flow paths. This approach is meant to match closely the physical laboratory test procedure, and it is oriented at analyzing the hydrodynamic aspects of the phenomenon (overtopping, breaking, Run-up, reflection) as well as the stability of armour elements. Therefore, for the results' validation, the numerical Run-up and reflection effects on virtual breakwater were compared with some empirical formulas and some similar laboratory tests. © 2015, World Scientific and Engineering Academy and Society. All rights reserved. Source

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