CAREER: Multiphase Sediment Transport Modeling Framework

职业：多相沉积物输运建模框架

• 批准号: 0644497
• 负责人: Tian-Jian (Tom) Hsu
• 金额: --
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-03-01 至 2009-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0644497&HistoricalAwards=false
• 关键词: CAREER; Multiphase; Sediment; Transport; Modeling

OCE-0644497A better understanding and the ability to predict coastal sediment transport processes are important in order to preserve the nation's coastal resources from natural disasters and human impacts. Being able to accurately predict large-scale coastal processes is dependant upon on having a detailed understanding of small-scale sediment transport that takes place along the coast. Intellectual Merit: Accurate prediction of large-scale coastal processes relies on detailed understanding of small-scale sediment transport. This project will develop a 3D fullycoupled multiphase LES (Large-eddy simulation) numerical modeling framework for sediment transport. The modeling approach for fluid-particle system utilizes both Eulerian-Eulerian two-fluid formulation to resolve 3D multiphase turbulent flow and Eulerian-Lagrangian formulation for further detailed PDF description of particles that are suitable for coastal sediment transport typical of millions of sediment particles. The new framework resolves 3D flow turbulence, fluid-particle interactions, inter-granular stresses and hence concurrently models the bedload and suspended load. It improves upon existing Reynolds average two-phase models for concentrated transport and single-phased 3D LES models for dilute flow. The educational plan outlines a career goal to establish a diversified Coastal/Oceanographic work force through developing a minority-oriented undergraduate research and education program. The research internship and the development of the undergraduate-level Coastal Engineering course will facilitate effective connection between the existing graduate-oriented Coastal/Oceanographic Program and undergraduate Engineering and Science students at University of Florida (UF). Broader impact: To preserve the nation's coastal resources from natural disasters (e.g., hurricane) and human impact, reliable predictive tools that allow long-temporal and largespatialsimulation of coastal/estuarine sediment transport processes is vital. The proposed project emphasizes utilizing detailed models to provide improved parameterizations of smallscale processes that can be further utilized by large-scale modelers to develop predictive tools for coastal/estuarine processes relevant to coastal planning and hazard mitigation. Establishing a diversified work force is imperative for this country that has been built upon multiculturalism. Coastal/Oceanographic discipline often deal with hazard mitigation and land preservation, issues that are relevant to economics, communities, and social justice. Hence it is especially vital to ensure broad participation in Coastal/Oceanographic professions. The proposed undergraduate research internship (2 non-UF minority students and 2 UF students per year) joins in and benefits from the existing NSF-sponsored SEAGEP at UF that is committed to increasing the number of minority students to pursue an academic/professional career. The outreach efforts to middle/high school students and teachers illustrate a theme based on "Coastal Hazard and Beach Processes". It will not only promote environmental literacy but also serves as a conduit to introduce to 8-12 grades students a fascinating science/engineering discipline for their higher education.

OCE-0644497更好地了解和预测沿海沉积物输送过程的能力对于保护国家沿海资源免受自然灾害和人类影响非常重要。能否准确预测大规模沿海过程取决于对沿海发生的小规模沉积物输送的详细了解。智力优势：大规模沿海过程的准确预测依赖于对小规模沉积物输送的详细了解。该项目将开发用于泥沙输运的 3D 全耦合多相 LES（大涡模拟）数值模拟框架。流体-颗粒系统的建模方法利用欧拉-欧拉双流体公式来解析 3D 多相湍流，并利用欧拉-拉格朗日公式来进一步详细描述颗粒，这些颗粒适用于典型的数百万沉积物颗粒的沿海沉积物输送。新框架解决了 3D 流动湍流、流体-颗粒相互作用、颗粒间应力，从而同时对床荷载和悬浮荷载进行建模。它改进了现有的浓缩传输雷诺平均两相模型和稀流单相 3D LES 模型。该教育计划概述了一个职业目标，即通过开发面向少数族裔的本科研究和教育计划，建立一支多元化的沿海/海洋学劳动力队伍。研究实习和本科水平海岸工程课程的开发将促进现有的面向研究生的海岸/海洋学项目与佛罗里达大学（UF）工程和科学本科生之间的有效联系。更广泛的影响：为了保护国家的沿海资源免受自然灾害（例如飓风）和人类影响，能够对沿海/河口沉积物输送过程进行长期和大空间模拟的可靠预测工具至关重要。拟议的项目强调利用详细模型来提供小规模过程的改进参数化，大规模建模者可以进一步利用这些参数来开发与沿海规划和减灾相关的沿海/河口过程的预测工具。对于这个建立在多元文化基础上的国家来说，建立多元化的劳动力队伍势在必行。沿海/海洋学学科通常涉及减灾和土地保护以及与经济、社区和社会正义相关的问题。因此，确保沿海/海洋专业的广泛参与尤为重要。拟议的本科生研究实习（每年 2 名非佛罗里达大学少数族裔学生和 2 名佛罗里达大学学生）加入并受益于现有的 NSF 资助的佛罗里达大学 SEAGEP，该项目致力于增加少数族裔学生追求学术/职业生涯的数量。针对中/高中学生和教师的外展工作展示了基于“海岸灾害和海滩过程”的主题。它不仅可以提高环境素养，还可以作为向 8-12 年级学生介绍高等教育中引人入胜的科学/工程学科的渠道。