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Explicit calculation of natural aeration using a Volume-of-Fluid model

机译：使用体积模型显式计算自然通风

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摘要

Accurate prediction of the air-entrainment process in air-water two-phase turbulent flows is one of the most computationally challenging subjects under current investigation in hydraulic engineering. An ideal numerical model for air-entrainment needs to be accurate and fast in the definition of a macroscopic interface and simultaneously precise enough to take into account the formation of bubbles through the free-surface, their transport and their natural interactions: bubble-bubble and bubble-fluid. The problem is made more complex by the strong coupling between mesh and solution exhibited by interface capturing schemes which are commonly used for such problems. This paper examines numerical and modelling aspects of the entrainment process for two canonical cases; the 2D dam break and 3D circular plunging jet cases. We start by investigating the capacities of a Volume-of-Fluid based model to detect the free-surface and predict the velocities inside the water phase, examining the effect of coarsening and refining the mesh on the prediction of the interface location. A reformulated explicit term is used to detect bubble formation and air-entrainment at the free-surface, without the need of a calibration process and adapted to run together with Volume-of-Fluid models. The results obtained with this new approach are further compared with similar cases in the literature in terms of bubble formation and free-surface wave's amplitude. The correct definition of the free-surface was found to be strongly dependent on the mesh refinement in a way that has very significant implications for the development of air-entrainment modelling.
机译：在当前水力工程研究中，准确预测空气-水两相湍流中的引气过程是计算上最具挑战性的主题之一。理想的空气夹带数值模型需要在定义宏观界面时准确而快速，同时要足够精确，以考虑到气泡通过自由表面的形成，它们的传输及其自然相互作用：气泡和气泡。泡沫流体。网格和解决方案之间的强耦合使问题变得更加复杂，而界面捕获方案通常会解决此类问题。本文研究了两种典型情况下夹带过程的数值和建模方面。 2D溃坝和3D圆形俯冲射流箱。我们首先研究基于流体体积的模型的能力，以检测自由表面并预测水相内部的速度，研究粗化和细化网格对界面位置预测的影响。重新定义的显式术语用于检测自由表面上的气泡形成和空气夹带，无需校准过程，并且适合与流体体积模型一起运行。用这种新方法获得的结果在气泡形成和自由表面波振幅方面与文献中的类似情况作了进一步比较。发现自由表面的正确定义在很大程度上依赖于网格细化，这对空气夹带模型的开发具有非常重要的意义。

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  • 来源
    《Applied Mathematical Modelling》 |2016年第18期|7504-7515|共12页
  • 作者

    Pedro Lopes; Gavin Tabor; Rita F. Carvalho; Jorge Leandro;

  • 作者单位

    Department of Civil Engineering, University of Coimbra, Coimbra, Portugal ,MARE-Marine and Environmental Sciences Centre, University of Coimbra, Coimbra, Portugal ,Hydraulic, Water Resources and Environment Laboratory, Room S.H.4.6, Department of Civil Engineering-Polo 2, University of Coimbra, Rua Luis Reis Santos, 3030-788 Coimbra, Portugal;

    College of Engineering, Mathematical and Physical Sciences, University of Exeter, Exeter, United Kingdom;

    Department of Civil Engineering, University of Coimbra, Coimbra, Portugal ,MARE-Marine and Environmental Sciences Centre, University of Coimbra, Coimbra, Portugal;

    Department of Civil Engineering, University of Coimbra, Coimbra, Portugal ,MARE-Marine and Environmental Sciences Centre, University of Coimbra, Coimbra, Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Air-entrainment; Air-water two-phase flow; Sub-grid explicit model; Volume-of-Fluid;

    机译：加气;气水两相流;子网格显式模型;液体量;

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