Effect of synthetic turbulence on hybrid RANS-LES simulation of cavity flow

GUO Qilong; LI Chen; LIU Pengxin; SUN Dong; ZHANG Hanxin

doi:10.7638/kqdlxxb-2020.0079

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Effect of synthetic turbulence on hybrid RANS-LES simulation of cavity flow

更新时间：2026-05-28

- Effect of synthetic turbulence on hybrid RANS-LES simulation of cavity flow
- Vol. 38, Issue 5, Pages: 980-988(2020)
- 作者机构：
  
  1. 中国空气动力研究与发展中心空气动力学国家重点实验室,绵阳,621000
  2. 中国空气动力研究与发展中心计算空气动力研究所,绵阳,621000
  3. 北京航空航天大学国家计算流体力学实验室,北京,100191
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2020.0079
  CLC： V211.3
- Published：2020
- 稿件说明：
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郭启龙, 李辰, 刘朋欣, 孙东, 张涵信. 合成湍流对空腔流动RANS-LES混合模拟结果的影响[J]. 空气动力学学报, 2020, 38(5): 980-988.

GUO Qilong, LI Chen, LIU Pengxin, et al. Effect of synthetic turbulence on hybrid RANS-LES simulation of cavity flow[J]. 2020, 38(5): 980-988.
郭启龙, 李辰, 刘朋欣, 孙东, 张涵信. 合成湍流对空腔流动RANS-LES混合模拟结果的影响[J]. 空气动力学学报, 2020, 38(5): 980-988. DOI： 10.7638/kqdlxxb-2020.0079.

GUO Qilong, LI Chen, LIU Pengxin, et al. Effect of synthetic turbulence on hybrid RANS-LES simulation of cavity flow[J]. 2020, 38(5): 980-988. DOI： 10.7638/kqdlxxb-2020.0079.

摘要

合成湍流作为一种能够有效抑制“灰区”问题的手段，在RANS-LES混合模拟中得到了广泛应用。由于空腔流动中存在主导的自持振荡机制，添加合成湍流对其RANS-LES混合模拟结果的影响目前还不明确。本文详细比较了合成湍流对马赫数0.6空腔流动的分区和非分区混合模拟带来的影响：对于剪切层，合成湍流显著增加了旋涡结构的三维特性和湍动能的大小；对于腔内的流动，添加合成湍流增大了后壁附近环流区的尺寸，进而降低了靠近后壁区域的剪切层动量厚度和平均压力分布，模拟结果更接近实验数据。合成湍流的使用会诱导产生更高频的模态，但是对Rossiter模态基本没有影响。通过对不同位置展向波数谱的比较，发现合成湍流对模拟结果的影响是通过改变腔内流动的三维机制而产生的。对比研究说明，如果主要关注流动的三维特性（如展向失稳模态），则来流边界层中的合成湍流脉动将对空腔流动的RANS-LES混合模拟结果有重要影响。

Abstract

As an effective method for mitigating the "grey area" problem

the synthetic turbulence has been extensively used in the hybrid RANS-LES simulations. Due to the existence of the dominated self-sustained oscillation mechanism of cavity flows

the influences of the synthetic turbulence on the results of hybrid simulations are still not clear. Such influences on the zonal and non-zonal hybrid simulations of the cavity flow of

=0.6 are compared in detail:For the shear layer

the synthetic turbulence increases the three-dimensionality of the vortical structures and the turbulent kinetic energy. For the fl

ow inside the cavity

the size of recirculation zone near the aft-wall become larger when the synthetic turbulence (ST) is added. Moreover

the momentum thickness of the shear layer and the mean pressure are reduced in the same region. The mean pressure with synthetic turbulence show good agreement with the experiment measurement. The employment of the ST would induce an additional mode with higher frequency

but has no effects on the Rossiter's modes. Through comparing the spanwise wavenumber spectra at different locations

it is found that the influences of the synthetic turbulence on the simulation results are produced by altering the three-dimensional flow mechanism. This study suggests that the synthetic turbulent fluctuations in the inflow boundary layer would significantly influence the results of the HRLM of the cavity flow

if the three-dimensionality (such as the spanwise instability) is of great concern.

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