SPH numerical investigation of the velocity field and vorticity generation within a hydrofoil-induced spilling breaker

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• 作者：Diana De Padova ; Michele Mossa ; Stefano Sibilla
• 关键词：Smoothed particle hydrodynamics models ; Physical modelling ; Hydrofoil ; Velocity field ; Vorticity
• 刊名：Environmental Fluid Mechanics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：16
• 期：1
• 页码：267-287
• 全文大小：1,720 KB
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• 作者单位：Diana De Padova (1)
  Michele Mossa (1)
  Stefano Sibilla (2)
  
  1. Department of Civil, Environmental, Building Engineering and Chemistry, Technical University of Bari, via Orabona, 4, 70125, Bari, Italy
  2. Department of Civil Engineering and Architecture, University of Pavia, via Ferrata 3, 27100, Pavia, Italy
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environmental Physics
  Mechanics
  Hydrogeology
  Meteorology and Climatology
  Oceanography
  
• 出版者：Springer Netherlands
• ISSN：1573-1510

文摘

In the present work, the velocity field and the vorticity generation in the spilling generated by a NACA 0024 hydrofoil were studied. SPH simulations were obtained by a pseudo-compressible XSPH scheme with pressure smoothing; both an algebraic mixing-length model and a two-equation model were used to represent turbulent stresses. Given the key role of vortical motions in the generation of the spilling breaker, the sources of vorticity were then examined in detail to confirm the interpretation of the mean flow vortical dynamics given in a paper by Dabiri and Gharib (J Fluid Mech 330: 113–139, [1997]). The high precision of the SPH model is confirmed through a comparison with experimental data. Experimental investigations were carried out by measuring the velocity field with a backscatter, two-component four-beam optic-fiber LDA system. The agreement between the numerical results and laboratory measurements in the wake region is satisfactory and allows the evaluation of the wave breaking efficiency of the device by a detailed analysis of the simulated flow field. Keywords Smoothed particle hydrodynamics models Physical modelling Hydrofoil Velocity field Vorticity