New models of turbulent sediment transport
湍流沉积物输送的新模型
基本信息
- 批准号:EP/V049054/1
- 负责人:
- 金额:$ 25.76万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2021
- 资助国家:英国
- 起止时间:2021 至 无数据
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The ability to predict the transport of suspended particles vitally underpins our quantitative understanding of sedimentary systems and the ways in which our environment has been shaped and continues to evolve in response to engineered or natural changes. Moreover, mobile particulate systems are ubiquitous in applications: examples from nature and industry include the evolution of aeolian, fluvial and marine sedimentary land- and sea-scapes, atmospheric dispersion of dense pollutants, pharmaceuticals processing and waste water treatment. In all of these situations, the presence of turbulent fluid motions maintain the denser than ambient particles in suspension, thereby facilitating their streamwise transport, and quantitative prediction of transport relies upon an accurate model of this suspension.Despite considerable scientific attention, our ability to model turbulent suspensions has advanced little in the eight decades following the foundational studies of 1930s and many popular approaches, including those used operationally in critical applications such as coastal engineering, are built upon potentially error-prone empirical formulations of the dynamics and associated sediment loads. It is this deficiency in models that we will address. We will tackle the fundamental scientific challenge of quantifying turbulent suspensions by developing a new, deeper theoretical framework to understand the dynamics of turbulent suspensions, which builds on recent advances in the theory and computation of fluid turbulence and the experimental measurement of flowing particles. These advances highlight the current weaknesses in existing models of suspensions and tantalise with the prospects for progress and the vast potential for applications, if the mathematical foundations were more secure. Our aim, therefore, is to develop a new paradigm for predicting suspended sediment transport.Our hypothesis is that dilute suspensions of relatively dense sediment in horizontal shear flows are maintained by intermittent coherent turbulent motions and we propose to investigate and quantify this process. Advances for single-phase flows made during the past three decades have seen many important results in which researchers isolated simple coherent flows embedded within turbulence, as exact invariant solutions to the governing Navier-Stokes equations. In the absence of suspended particles, a small number of these states have been shown to guide the evolution of even highly turbulent flows. Moreover, unlike turbulence itself, their physics is now well-understood in terms of some basic interacting processes. At the same time, advances in computational power and techniques have vastly improved the numerical simulation of turbulent flows, while modern experimental methods are beginning to measure three-dimensional velocity and sediment concentration fields at high spatial and temporal resolutions, both of which provide a fertile testing ground for this project. This presents a timely opportunity to investigate two-phase flows, identify their coherent structures and determine how they are related to overall properties of a turbulent suspension and thus the rate of sediment transport. The successes of this approach for single-phase shear flows indicate that this would lead to a step change in our scientific understanding of the two-phase case, paving the way for improved predictive descriptions of turbulent sediment transport that obviate the need for unreliable empirical closures.
预测悬浮颗粒运输的能力至关重要地巩固了我们对沉积系统的定量理解,以及我们的环境如何被塑造并继续演变以应对工程或自然变化的方式。此外,移动的微粒系统在各种应用中无处不在:自然界和工业界的例子包括风成、河流和海洋沉积陆地和海洋景观的演变、稠密污染物的大气扩散、药物加工和废水处理。在所有这些情况下,湍流运动的存在使悬浮液中的颗粒比周围环境的颗粒更致密,从而促进了它们的流向传输,并且传输的定量预测依赖于这种悬浮液的精确模型。尽管有相当多的科学关注,但是在20世纪30年代的基础研究和许多流行的方法之后的80年中,我们对湍流悬浮液的建模能力几乎没有进步,包括那些在海岸工程等关键应用中实际使用的方法,都是建立在可能容易出错的动力学和相关沉积物负荷的经验公式基础上的。我们要解决的正是模型中的这种缺陷。我们将通过开发一个新的,更深入的理论框架来理解湍流悬浮液的动力学,这是建立在流体湍流的理论和计算以及流动颗粒的实验测量的最新进展的基础上,来解决量化湍流悬浮液的基本科学挑战。这些进展突出了现有悬浮模型的弱点,并诱人的进展前景和巨大的应用潜力,如果数学基础更加安全。因此,我们的目标是开发一个新的模式,预测悬浮泥沙transport.Our假设是,相对密集的泥沙在水平剪切流的稀悬浮液是由间歇性相干湍流运动,我们建议调查和量化这一过程。在过去的三十年里,单相流的进展已经看到了许多重要的结果,其中研究人员隔离了嵌入湍流中的简单相干流,作为控制Navier-Stokes方程的精确不变解。在没有悬浮颗粒的情况下,这些状态中的一小部分已经被证明可以引导甚至高度湍流的演变。此外,与湍流本身不同,它们的物理学现在在一些基本的相互作用过程中得到了很好的理解。与此同时,计算能力和技术的进步极大地改进了湍流的数值模拟,而现代实验方法开始以高空间和时间分辨率测量三维速度和泥沙浓度场,这两者都为这一项目提供了肥沃的试验场。这提供了一个及时的机会,调查两相流,确定其相干结构,并确定它们是如何与湍流悬浮液的整体性能,从而泥沙输运率。单相剪切流的这种方法的成功表明,这将导致一个步骤的变化,在我们的科学理解的两相情况下,铺平了道路,改善预测描述湍流泥沙输运,消除了不可靠的经验关闭的需要。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Mathematical models of erosive flash floods, huaycos and lahars, Abstract Book | 7th IAHR Europe Congress - Athens, Greece (2022)
侵蚀性山洪、huaycos 和火山泥浆的数学模型,摘要书 |
- DOI:
- 发表时间:2022
- 期刊:
- 影响因子:0
- 作者:Hogg AJ
- 通讯作者:Hogg AJ
Two regimes of dilute turbulent settling suspensions under shear
剪切下稀湍流沉降悬浮液的两种状态
- DOI:10.48550/arxiv.2310.08508
- 发表时间:2023
- 期刊:
- 影响因子:0
- 作者:Langham J
- 通讯作者:Langham J
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Andrew Hogg其他文献
Andrew Hogg的其他文献
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