Lagrangian statistics in isotropic turbulent flows with deterministic and stochastic forcing schemes
Lagrangian statistics in isotropic turbulent flows with deterministic and stochastic forcing schemes
复制标题
具有确定性和随机强迫方案的各向同性湍流的拉格朗日统计
DOI：
10.1007/s10409-015-0012-x
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发表时间：
2015-02-01
影响因子：
3.5
通讯作者：
Zhang, Jian
中科院分区：
文献类型：
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作者：
Chen, Jin-Cai;Jin, Guo-Dong;Zhang, Jian
人工输入能量到流中是必要的，以创建和维持统计上稳定的各向同性湍流，用于研究统计中的采样。由于不同傅里叶模式之间通过三元相互作用的非线性耦合，各种强迫方案是否会影响湍流中的统计数据是一个重要且悬而未决的问题。我们提出了详细的比较拉格朗日统计的流体颗粒在强迫各向同性湍流流在1283，2563，和5123模拟，泰勒尺度雷诺数在64-171的范围内，使用确定性和随机强迫方案，分别。几个拉格朗日统计进行了比较，如速度和加速度的自相关，和拉格朗日速度增量的时刻。两种强迫方案得到的拉格朗日统计量的差异很小，表明各向同性强迫方案对各向同性湍流的拉格朗日统计量影响很小。
Artificial input of energy into the flow is necessary to create and maintain a statistically stationary isotropic turbulence for sampling in studying the statistics. Due to the nonlinear coupling among different Fourier modes through the triadic interaction, whether or not various forcing schemes affect the statistics in turbulence is an important and open question. We present detailed comparison of Lagrangian statistics of fluids particles in forced isotropic turbulent flows in 1283, 2563, and 5123simulations, with Taylor-scale Reynolds numbers in the range of 64–171, using a deterministic and a stochastic forcing scheme, respectively. Several Lagrangian statistics are compared, such as velocity and acceleration autocorrelations, and moments of Lagrangian velocity increments. The differences in the Lagrangian statistics obtained from the two forcing schemes are shown to be small, indicating that the isotropic forcing schemes used have little effects on the Lagrangian statistics in the isotropic turbulence.