An in-depth numerical investigation of a supersonic cavity-ramp flow with DDES method

An in-depth numerical investigation of a supersonic cavity-ramp flow with DDES method
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采用 DDES 方法对超声速空腔斜坡流进行深入数值研究

DOI:
10.1016/j.ast.2019.03.055
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发表时间:
2019-06
影响因子:
5.6
通讯作者:
李椿萱
李椿萱
中科院分区:
工程技术1区
文献类型:
--
作者:
吴正园;高振勋;蒋崇文;李椿萱

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采用延迟分离涡模拟(DDES)方法,成功地模拟了高非定常超声速空泡斜坡流场。人们普遍认为,准确预测可压缩不稳定剪切层以及随后的重新附着过程是DDES方法面临的一个很大挑战。在目前的DDES研究的基础上,工程负担得起的网格,取得了显着的改善评估的协议与实验数据。详细分析了与DDES有关的各种关键参数的影响。首先,发现要获得精确的结果,需要具有足够计算域的精细网格,并且需要适当地设置时间步长。其次,亚网格长度尺度Δ的定义对数值模拟结果有影响,特别是在剪切层的初始区域。DDES方法的原始Δ形式倾向于抑制剪切层不稳定性的发展。分析了物理原因。此外,还观察和分析了DDES屏蔽函数fd在当前情况下的意外表现,并着重讨论了其对下游区模拟特性的影响。
Delayed detached eddy simulation (DDES) studies of the highly unsteady supersonic cavity-ramp flow have been successfully carried out. It is generally believed that accurate prediction of the compressible unstable shear layer coupled with the followed reattaching process is a big challenge for DDES method. In the current DDES studies based on an engineering affordable mesh, significant improvements are achieved assessed by the agreements with experimental data. Effects of various crucial parameters related to DDES have been analyzed in detail. First of all, it is found that a fine mesh with sufficient computation domain is required to obtain accurate results, and the time step needs to be properly set. Secondly, effect of the definition of subgrid length scale Δ is observed, especially in the initial region of shear layer. The original Δ form of DDES method tends to depress the development of instabilities in the shear layer. Analysis on the physical causes is presented. Moreover, unexpected performance of DDES'shield function f d for the current case is observed and analyzed, whose influence on the simulated characteristic in the downstream region has also been discussed in particular.
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