SI2-SSE: A Next-Generation Open-Source Computational Fluid Dynamic Code for Polydisperse Multiphase Flows in Science and Engineering

SI2-SSE：科学与工程中多分散多相流的下一代开源计算流体动力学代码

• 批准号: 1440443
• 负责人: Alberto Passalacqua
• 金额: $ 49.96万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-10-01 至 2019-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1440443&HistoricalAwards=false
• 关键词: SI2; SSE; Next; Generation; Open

Many processes for the production of drugs, fuels and plastic materials, as well as energy from coal or biomasses, involve multiphase flows, which are composed by a combination of a fluid, either liquid or gas, and particles, droplets or bubbles. This type of flow is also naturally present in the environment. Examples are the formation of a mixture of air and solid particles due to volcanic eruptions, and particles of sand and other materials transported by the wind. Scientists and engineers use software to study how these flows behave in order to improve the yield of industrial processes, reduce their environmental impact, and energy consumption. The computer programs used to perform these studies solve complex mathematical problems, and require powerful computers to be able to obtain the results in a useful time. This project focuses on developing the next generation of computer software for the simulation of multiphase flows, enabling it to use the latest generation of computers which combine traditional and graphical processors for improved performance. This software will be released to the public and will enable, scientists and engineers from different research areas to tackle real-world problems by taking advantage of the latest developments in multiphase flow science, combined with the benefit of being able to use the software on powerful computer infrastructures. Students and educators will be able to use the software and learn about multiphase flows through the examples and the documentation that will be provided.The objectives of the project will be achieved by first developing computational models to describe turbulent flows in the framework of quadrature-based moment methods, an efficient and accurate approach to describe this type of flows. These computational models will then be implemented, together with appropriate numerical methods that will ensure the accuracy of the computational codes, in the open-source framework OpenFOAM. Three representative problems of typical multiphase flows will be considered: a population balance equation for particles with negligible inertia, such as in the formation of nanoparticles in a fluid flow; the description of gas-liquid flows, where the bubble inertia is small but not zero; and the most complex case of gas-solid flows, where particle inertia is large. The possibility of using graphical processing units will be added to the OpenFOAM framework, to enable it to run on hybrid computational systems involving traditional processors and graphical processing units. The source code and its documentation will be made available to the public at an early stage of their development, under the GNU GPL 3 license, in order to disseminate the results of the research and gather feedback. Detailed code documentation, verification and validation cases, and tutorials will also be created to favor external contributions to the software.

生产药物、燃料和塑料材料以及煤炭或生物质能源的许多过程涉及多相流，这些多相流由液体或气体和颗粒、液滴或气泡的组合组成。这种类型的流动也自然地存在于环境中。例如，火山喷发形成了空气和固体颗粒的混合物，风吹走了沙子和其他物质的颗粒。科学家和工程师使用软件研究这些流动的行为，以提高工业过程的产量，减少其对环境的影响，并减少能源消耗。用于进行这些研究的计算机程序解决复杂的数学问题，并且需要功能强大的计算机才能在有用的时间内获得结果。该项目专注于开发用于多相流模拟的下一代计算机软件，使其能够使用将传统处理器和图形处理器相结合的最新一代计算机，以提高性能。该软件将向公众发布，将使来自不同研究领域的科学家和工程师能够利用多相流科学的最新发展，结合能够在强大的计算机基础设施上使用该软件的好处，来解决现实世界的问题。学生和教育工作者将能够使用该软件，并通过所提供的例子和文件了解多相流。该项目的目标将首先开发计算模型来描述基于积分的矩量法框架中的湍流流动，这是一种描述这类流动的有效且准确的方法。然后，将在开放源码框架OpenFOAM中实施这些计算模型，以及确保计算代码准确性的适当数值方法。将考虑典型多相流的三个典型问题：具有可忽略惯性的颗粒的颗粒平衡方程，例如在流体流动中形成纳米颗粒；气液流动的描述，其中气泡惯性较小但不为零；以及最复杂的气固流动情况，其中颗粒惯性较大。OpenFOAM框架将增加使用图形处理单元的可能性，使其能够在涉及传统处理器和图形处理单元的混合计算系统上运行。源代码及其文件将根据GNU GPL 3许可证在开发的早期阶段向公众提供，以传播研究结果并收集反馈。还将创建详细的代码文档、验证和验证案例以及教程，以支持外部对软件的贡献。