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首页> 外文期刊>Journal of Hydroinformatics >Modelling aerated flows with smoothed particle hydrodynamics
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Modelling aerated flows with smoothed particle hydrodynamics

机译：用平滑的粒子流体动力学模拟充气流

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摘要

Modelling aerated flows is a complex application of computational fluid dynamics (CFD) since the interfaces between air and water change rapidly. In this work, the simulation of aerated flows with the smoothed particle hydrodynamics (SPH) method is investigated with a focus towards the application in engineering practice. To prove the accuracy of the method, the processes of air entrainment and rising air bubbles are studied. Through monitoring the evolution of the bubble contours it is shown that the novel approach of adding artificial repulsion forces at the interface does not alter the dynamics but stabilizes the flow. Building on these fundamental processes we extend the discussion to practical applications with a special focus on forced aeration. Since the employment of a detailed SPH model to practical problems remains out of bounds due to the high computational demand, we propose a combined experimental and numerical study where experimental bubble characteristics are imposed on the numerical simulation. Based on the data of the conducted bubble column experiment, the computational demand is significantly decreased such that the oxygen consumption due to biokinetic processes can be modelled. The future perspective is to apply SPH to urban water systems, e.g., for simulating detailed processes in wastewater treatment and sewer hydraulics.
机译：由于空气和水之间的界面变化迅速，因此对充气流进行建模是计算流体动力学（CFD）的复杂应用。在这项工作中，研究了用平滑粒子流体动力学（SPH）方法模拟曝气流，重点是在工程实践中的应用。为了证明该方法的准确性，研究了空气夹带和上升气泡的过程。通过监测气泡轮廓的演变，表明在界面处添加人工排斥力的新方法不会改变动力学，但可以稳定流动。在这些基本过程的基础上，我们将讨论扩展到实际应用，并特别关注强制通风。由于对计算问题的需求很大，因此无法使用详细的SPH模型解决实际问题，因此，我们提出了结合实验和数值研究的方法，其中将实验气泡特性施加于数值模拟上。基于进行的鼓泡塔实验的数据，计算需求显着降低，因此可以对由于生物动力学过程引起的耗氧量进行建模。未来的前景是将SPH应用于城市供水系统，例如模拟废水处理和下水道水力系统的详细过程。

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