Transport Processes in Inland and Coastal Waters

内陆和沿海水域的运输过程

• 批准号: RGPIN-2019-05776
• 负责人: Chu, Vincent
• 金额: $ 2.26万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=749499
• 关键词: Transport; Processes; Inland; Coastal; Waters

In an era of climate change and urban sprawl where flood damage to human life and property are occurring with increasing frequency, the renditions of catastrophic events by severe storms are still very much reliant on models, and these in turn depend on the expert deployment of computational resources. Our research has been focusing on the fronts between water/air masses of different density (Chu 2014; Karimpour Chu Wang PhD thesis 2016; Xie, Karimpour & Chu 2017) and the impact forces of tsunami waves on coastal structures (Xie & Chu 2018a,b). These processes are dependent on waves and turbulence over a wide range of lengths and depths, and in inland and coastal waters the horizontal length of these processes are one or more orders of magnitude greater than the depths of the currents. Our unique numerical method addresses the steep gradient of the shock waves that feed energy toward the fronts of waves. We have successfully implemented our shock-capturing method within the framework of the classical method (Ghanadi & Chu 2015; Karimpour & Chu 2014, 2016, 2018). More importantly, we have invented a novel Lagrangian block simulation method where the computations are conducted by advection of blocks in a Lagrangian reference frame (Tan & Chu 2009; Chu & Altai 2012). The way in which our Lagrangian block simulation eliminates the spurious oscillations and false numerical damping that are inherent in the classical method has allowed us to address many previously unsolvable problems (Tan & Chu 2010a,b,c, 2012 & 2014; Chu and Altai 2018). Our research in the next five years will continue to focus on the modelling of turbulence and waves by simulation. Although a host of rapid advances in computational infrastructure currently have the potential to revolutionize engineering design and research, spurious oscillations and false diffusion have remained insurmountable obstacles. Our research plan will further develop our novel Lagrangian simulation codes for three-dimensional models that overcome these obstacles. We will also further develop our models of ocean currents and atmospheric wind, focusing on the brief and intense exchange at the "window of instability" that is believed to be associated with severe storms using the Lagrangian block simulation method. Our recent simulations of the wave force on a vertical seawall (Xie & Chu 2018a) and the force on coastal structures of finite width (Xie & Chu 2018b) were obtained using open-source codes. The considerable expertise that we acquired with the open-source-code repository tools will support our further studies of the classical method and the novel Lagrangian block simulation method.

在气候变化和城市扩张的时代，洪水对人类生命和财产的损害越来越频繁，严重风暴造成的灾难性事件的再现仍然非常依赖于模型，而这些反过来又取决于计算资源的专家部署。我们的研究一直专注于不同密度的水/气团之间的前沿（Chu 2014; Karimpour Chu Wang博士论文2016; Xie，Karimpour & Chu 2017）以及海啸波对沿海结构的冲击力（Xie & Chu 2018 a，B）。这些过程取决于各种长度和深度的波浪和湍流，在内陆和沿海沃茨，这些过程的水平长度比海流深度大一个或多个数量级。我们独特的数值方法解决了冲击波的陡峭梯度，将能量输送到波前。我们已经在经典方法的框架内成功地实现了我们的冲击捕获方法（Ghanadi & Chu 2015; Karimpour & Chu 2014，2016，2018）。更重要的是，我们发明了一种新的拉格朗日块模拟方法，其中通过拉格朗日参考系中的块的平流进行计算（Tan & Chu 2009; Chu & Altai 2012）。我们的拉格朗日块模拟消除了经典方法中固有的虚假振荡和虚假数值阻尼的方式，使我们能够解决许多以前无法解决的问题（Tan & Chu 2010 a，B，c，2012 & 2014; Chu and Altai 2018）。我们在未来五年的研究将继续集中在湍流和波浪的模拟模型。尽管计算基础设施的快速发展有可能彻底改变工程设计和研究，但虚假振荡和虚假扩散仍然是无法克服的障碍。我们的研究计划将进一步开发我们的新拉格朗日模拟代码的三维模型，克服这些障碍。我们还将进一步发展我们的洋流和大气风模型，重点是在“不稳定窗口”的短暂和强烈的交换，这被认为是与使用拉格朗日块模拟方法的严重风暴。我们最近对垂直海堤上的波浪力（Xie & Chu 2018 a）和有限宽度海岸结构物上的力（Xie & Chu 2018 b）的模拟是使用开源代码获得的。大量的专业知识，我们获得的开源代码库工具将支持我们的经典方法和新的拉格朗日块模拟方法的进一步研究。