Towards direct numerical simulations of low-Mach number turbulent reacting and two-phase flows using immersed boundaries
Towards direct numerical simulations of low-Mach number turbulent reacting and two-phase flows using immersed boundaries
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DOI：
10.1016/j.compfluid.2016.03.017
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发表时间：
2016-06-05
影响因子：
2.8
通讯作者：
Thevenin, Dominique
中科院分区：
文献类型：
--
作者：
Abdelsamie, Abouelmagd;Fru, Gordon;Thevenin, Dominique
大多数有实际意义的反应流和两相流都是湍流，但发生在低马赫数或不可压缩条件下。为了调查这种复杂的流动的性质，具有高精度，但可接受的计算时间，一个合适的工具，直接数值模拟（DNS），称为DINOSOARS，已经开发。本文描述了该代码中实现的数值组件和方法，以及详细的验证和确认阶段，并以两个全面模拟的示例结束。我们希望它可能是有用的“验证和验证指南”的其他研究人员工作的DNS反应流。由于DNS考虑了日益复杂的应用程序，因此实现了直接边界浸入边界法（DB-IBM），允许在固定但可能细化的笛卡尔网格上描述任意几何形状。在DINOSOARS中也实现了一个直接力IBM，以解决网格上的大型移动球形粒子（比Kolmogorov尺度大得多）。Kolmogorov尺度以下的颗粒被视为点颗粒，同时考虑到额外的热量和质量传递与连续流。代码的高效并行化依赖于开源库2DECOMP&FFT。基本的泊松方程求解快速和准确的方式FFT，即使是非周期性的边界条件。DINOSOARS的灵活性使其成为一个非常有前途的工具，用于分析涉及湍流反应和/或两相流的各种问题和应用。(C)2016爱思唯尔有限公司版权所有。
Most reacting and two-phase flows of practical interest are turbulent but take place at low Mach numbers or under incompressible conditions. In order to investigate the properties of such complex flows with high accuracy but acceptable computing times, a suitable tool for Direct Numerical Simulations (DNS), called DINOSOARS, has been developed. The present article describes the numerical components and methods implemented in this code, together with a detailed verification and validation phase, and finishes with two examples of full-scale simulations. We hope it might be useful as a "verification and validation guideline" for other researchers working on DNS of reacting flows. Since applications of growing complexity are considered by DNS, a Direct Boundary Immersed Boundary Method (DB-IBM) has been implemented, allowing a description of arbitrary geometries on a fixed, but possibly refined, Cartesian mesh. A direct force IBM is implemented as well in DINOSOARS in order to resolve large moving spherical particles (much larger than the Kolmogorov scale) on the grid. Particles below the Kolmogorov scale are treated as point particles, taking into account additionally heat and mass transfer with the continuous flow. The efficient parallelization of the code relies on the open-source library 2DECOMP&FFT. The underlying Poisson equation is solved in a fast and accurate manner by FFT, even for non-periodic boundary conditions. The flexibility of DINOSOARS makes it a very promising tool for analyzing a variety of problems and applications involving turbulent reacting and/or two-phase flows. (C) 2016 Elsevier Ltd. All rights reserved.