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一种用于含液滴湍流流动数值模拟的多尺度方法。

A Multiscale Approach for the Numerical Simulation of Turbulent Flows with Droplets.

作者信息

Gimenez Juan M, Idelsohn Sergio R, Oñate Eugenio, Löhner Rainald

机构信息

Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), Edifici C1 Campus Nord UPC C/ Gran Capità, 08034 Barcelona, Spain.

Centro de Investigaciones de Métodos Computacionales (CIMEC), Predio CONICET Colectora Ruta Nac Nro 168, Km 0, 3000 Santa Fe, Argentina.

出版信息

Arch Comput Methods Eng. 2021;28(6):4185-4204. doi: 10.1007/s11831-021-09614-6. Epub 2021 Jun 26.

DOI:10.1007/s11831-021-09614-6
PMID:34220195
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8235920/
Abstract

A multiscale approach for the detailed simulation of water droplets dispersed in a turbulent airflow is presented. The multiscale procedure combines a novel representative volume element (RVE) with the Pseudo Direct Numerical Simulation (P-DNS) method. The solution at the coarse-scale relies on a synthetic model, constructed using precomputed offline RVE simulations and an alternating digital tree, to characterize the non-linear dynamic response at the fine-scale. A set of numerical experiments for a wide range of volume fractions, particle distribution sizes, and external shear forces in the RVE are carried out. Quantitative results of the statistically stationary turbulent state are obtained, and the turbulence modulation phenomenon due to the presence of droplets is discussed. The developed synthetic model is then employed to solve global scale simulations of flows with airborne droplets via the P-DNS method. Improved predictions are obtained for flow conditions where turbulence modulation is noticeable.

摘要

提出了一种用于详细模拟分散在湍流气流中的水滴的多尺度方法。该多尺度过程将一种新型代表性体积单元（RVE）与伪直接数值模拟（P-DNS）方法相结合。粗尺度的解依赖于一个综合模型，该模型使用预先计算的离线RVE模拟和交替数字树构建，以表征细尺度的非线性动态响应。针对RVE中广泛的体积分数、颗粒分布尺寸和外部剪切力进行了一组数值实验。获得了统计稳定湍流状态的定量结果，并讨论了由于水滴的存在而产生的湍流调制现象。然后，通过P-DNS方法，将所开发的综合模型用于求解带有空中水滴的流动的全局尺度模拟。对于湍流调制明显的流动条件，获得了改进的预测结果。

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