湍流基于EMMS原理的介尺度建模
发布时间：2018-11-04 17:03
【摘要】：工程湍流问题中往往存在湍动和非湍动(即层流)区域共存的特点,而传统湍流模型假定计算网格内流体总是处于充分湍流状态,忽视了流动中的层流部分,导致模拟的准确性不足.本文介绍基于能量最小多尺度(Energy Minimization Multi-Scale,EMMS)原理发展介尺度湍流模型,用于提升工程湍流模拟的预测性能;探索湍流中黏性和惯性控制机制通过竞争中的协调形成多尺度结构及稳定性条件;分析模型拓展的物理基础、数学表达及其验证与应用.文章初步认为,水力学中的最小和最大能耗率争论已久,EMMS湍流模型分析两者的基本假设,进而做出统一解释.最后,展望EMMS湍流模型仍需解决的问题以及湍流介尺度方法.
[Abstract]:In engineering turbulence problems, both turbulent and non-turbulent (i.e. laminar) regions often coexist, but the traditional turbulence model assumes that the fluid in the computational grid is always in a sufficient turbulence state and neglects the laminar flow in the flow. The simulation is not accurate enough. In this paper, the mesoscale turbulence model is developed based on the principle of minimum energy multi-scale (Energy Minimization Multi-Scale,EMMS, which is used to improve the prediction performance of engineering turbulence simulation. The viscous and inertial control mechanisms in turbulence are explored to form multi-scale structures and stability conditions through coordination in competition, and the physical basis, mathematical expression, verification and application of the extended model are analyzed. This paper preliminarily holds that the minimum and maximum energy consumption rates in hydraulics have been debated for a long time. The EMMS turbulence model analyzes the basic assumptions of the two models and then makes a unified interpretation. Finally, the problems still to be solved in EMMS turbulence model and the mesoscale method of turbulence are discussed.
【作者单位】： 中国科学院过程工程研究所多相复杂系统国家重点实验室;
【基金】：国家自然科学基金(编号:91434113,21106155) 国家重点基础研究发展计划(编号:2015CB251402) 中国科学院战略先导科技专项(编号:XDA07080303) 国防科技创新基金(编号:CXJJ-14-Z72)资助项目
【分类号】：O357.5
，
本文编号：2310547
[Abstract]:In engineering turbulence problems, both turbulent and non-turbulent (i.e. laminar) regions often coexist, but the traditional turbulence model assumes that the fluid in the computational grid is always in a sufficient turbulence state and neglects the laminar flow in the flow. The simulation is not accurate enough. In this paper, the mesoscale turbulence model is developed based on the principle of minimum energy multi-scale (Energy Minimization Multi-Scale,EMMS, which is used to improve the prediction performance of engineering turbulence simulation. The viscous and inertial control mechanisms in turbulence are explored to form multi-scale structures and stability conditions through coordination in competition, and the physical basis, mathematical expression, verification and application of the extended model are analyzed. This paper preliminarily holds that the minimum and maximum energy consumption rates in hydraulics have been debated for a long time. The EMMS turbulence model analyzes the basic assumptions of the two models and then makes a unified interpretation. Finally, the problems still to be solved in EMMS turbulence model and the mesoscale method of turbulence are discussed.
【作者单位】： 中国科学院过程工程研究所多相复杂系统国家重点实验室;
【基金】：国家自然科学基金(编号:91434113,21106155) 国家重点基础研究发展计划(编号:2015CB251402) 中国科学院战略先导科技专项(编号:XDA07080303) 国防科技创新基金(编号:CXJJ-14-Z72)资助项目
【分类号】：O357.5
，
本文编号：2310547
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