Large-eddy simulation of turbulent cavitating flow in a micro channel
Large-eddy simulation of turbulent cavitating flow in a micro channel
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DOI：
10.1063/1.4891325
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发表时间：
2014-08-01
影响因子：
4.6
通讯作者：
Adams, Nikolaus A.
中科院分区：
文献类型：
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作者：
Egerer, Christian P.;Hickel, Stefan;Adams, Nikolaus A.
采用大涡模拟(LES)方法研究了类柴油流体在一般节流几何形状下的空化流动。两相区采用无参数热力学平衡混合物模型，并考虑了液体和气液混合物的可压缩性。采用适用于空化流动的自适应局部反卷积方法(ALDM)对均匀混合物的Navier-Stokes方程的对流项进行离散。ALDM是一种基于有限体积的隐式大涡模拟方法，它融合了物理激励的湍流模拟和数值离散。以空化湍流混合层为例对数值方法进行了验证。给出了两种不同工况下节流流动的实验数据比较。采用空化模型的大涡模拟在实验的不确定范围内准确地预测了相关的流动和空化特性。进一步分析了流动的湍流结构，重点分析了空化和相干运动之间的相互作用，以及统计平均流动的演变。(C)2014 AIP出版有限责任公司。
Large-eddy simulations (LES) of cavitating flow of a Diesel-fuel-like fluid in a generic throttle geometry are presented. Two-phase regions are modeled by a parameter-free thermodynamic equilibrium mixture model, and compressibility of the liquid and the liquid-vapor mixture is taken into account. The Adaptive Local Deconvolution Method (ALDM), adapted for cavitating flows, is employed for discretizing the convective terms of the Navier-Stokes equations for the homogeneous mixture. ALDM is a finite-volume-based implicit LES approach that merges physically motivated turbulence modeling and numerical discretization. Validation of the numerical method is performed for a cavitating turbulent mixing layer. Comparisons with experimental data of the throttle flow at two different operating conditions are presented. The LES with the employed cavitation modeling predicts relevant flow and cavitation features accurately within the uncertainty range of the experiment. The turbulence structure of the flow is further analyzed with an emphasis on the interaction between cavitation and coherent motion, and on the statistically averaged-flow evolution. (C) 2014 AIP Publishing LLC.