Shock-induced turbulent multi-material mixing

冲击引起的湍流多材料混合

• 批准号: 1440072
• 负责人: Sanjiva Lele
• 金额: --
• 依托单位: Stanford 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: 2014-08-01 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1440072&HistoricalAwards=false
• 关键词: Shock; induced; turbulent; multi; material

The National Academy of Engineering has identified "Provide Energy from Fusion" as one of the grand challenges for engineering. Inertially confined fusion (ICF) presents a source of clean energy that is sustainable and has a potentially huge role to play in addressing concerns over energy security and global climate change. The Richtmyer-Meshkov (RM) hydrodynamic instability that causes premature mixing of the capsule interface has been identified as a critical factor that limits the performance of ICF. Though the ICF problem is far more complex, predictive simulations of the hydrodynamics of shock-induced mixing is a key enabler for better design of ICF targets.The proposed research entails high fidelity simulations of shock-induced multi-material mixing in a simple yet realistic configuration. The fast time scales of the problem limit the scope of experimental measurements and hence, numerical simulations have a critical role to play in bridging the gap between theory and experiments by allowing exploration of important aspects of the flow physics that are inaccessible to experiments. Close coordination with a laboratory experiment whose conditions are duplicated in the simulations will allow systematic validation of the computed results at large-scales. Databases on RMI driven turbulence at unprecedented spatial resolution are expected and will allow fundamental questions about turbulence physics in strongly driven transient flows to be investigated and also support development of novel sub-scale closures for variable density turbulence.

美国国家工程院已将“从聚变中提供能量”确定为工程的重大挑战之一。惯性约束聚变是一种可持续的清洁能源，在解决能源安全和全球气候变化问题方面可能发挥巨大作用。Richtmyer-Meshkov（RM）流体动力学不稳定性导致胶囊界面的过早混合，已被确定为限制ICF性能的关键因素。虽然ICF问题要复杂得多，但冲击诱导混合流体动力学的预测模拟是更好地设计ICF靶的关键因素。拟议的研究需要在简单而现实的配置中对冲击诱导多材料混合进行高保真度模拟。快速的时间尺度的问题限制了实验测量的范围，因此，数值模拟在弥合理论和实验之间的差距中发挥着至关重要的作用，允许探索的重要方面的流动物理实验是无法访问的。与实验室实验的密切协调，其条件在模拟中重复，将允许在大规模的计算结果的系统验证。RMI驱动的湍流在前所未有的空间分辨率的数据库，预计将允许在强驱动的瞬态流的湍流物理学的基本问题进行调查，也支持开发新的子尺度封闭的变密度湍流。