Mixing and transport in water bodies

在水体中的混合和输送

• 批准号: RGPIN-2015-05056
• 负责人: Mohammadian, Majid
• 金额: $ 1.6万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=613329
• 关键词: Mixing; transport; water; bodies

Mixing processes in water bodies involves various phenomena at small and large scales. At “small” scales such as outfalls, rotation effects are not significant while at large scales they are important. At large scales such as “Great Lakes” and oceanic problems, Coriolis effect can play an important role. Numerical simulation of mixing processes is a challenging issue, both from numerical aspects and from modelling strategies. It is in the best interest of the numerical modelling community to obtain faster and more accurate methods to improve simulations. The proposed research program is aimed at the development of accurate and efficient tools for simulating flow and mixing processes in water resources, based on the applicant’s background in high-performance computing and fluid mechanics. In this research, the new, highly accurate temporal and spatial numerical methods recently proposed by the applicant for free surface flows will be extended to simulate mixing processes in three dimensions. Moreover, recent developments by the applicant in modeling turbulent buoyant outfalls will be expanded to more practical cases and the impact of free surface processes such as waves on mixing will be further examined. At larger scales, interaction of waves and turbulence occurs under the Coriolis effect, which is not yet well understood. Correct modelling of these interactions is crucial for ocean modelling and simulation of climate changes. The emergence of large-scale flows such as oceanic jets from small-scale turbulence has been also studied by the applicant, and appropriate numerical methods have been also proposed, which will be further expanded and studied in this research program.

水体中的混合过程涉及各种小尺度和大尺度的现象。在“小”尺度，如排水口，旋转的影响是不显着的，而在大尺度上，他们是重要的。在诸如“五大湖”和海洋问题等大尺度上，科里奥利效应可以发挥重要作用。混合过程的数值模拟是一个具有挑战性的问题，无论是从数值方面还是从建模策略。获得更快、更准确的方法来改进模拟符合数值模拟界的最大利益。拟议的研究计划的目的是开发准确和有效的工具，用于模拟水资源中的流动和混合过程，基于申请人在高性能计算和流体力学方面的背景。在这项研究中，申请人最近提出的用于自由表面流的新的、高精度的时间和空间数值方法将被扩展到模拟三维混合过程。此外，申请人在模拟湍流浮力排水口方面的最新进展将扩展到更实际的情况，并将进一步研究自由表面过程（如波浪）对混合的影响。在更大的尺度上，波和湍流的相互作用发生在科里奥利效应下，这还没有得到很好的理解。这些相互作用的正确建模对于海洋建模和气候变化模拟至关重要。申请人还研究了海洋射流等大尺度流动从小尺度湍流中的出现，并提出了适当的数值方法，将在本研究计划中进一步扩展和研究。