【2h】

Turbulence generation from a stochastic wavelet model

机译:随机小波模型产生的湍流

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摘要

This research presents a new turbulence generation method based on stochastic wavelets and tests various properties of the generated turbulence field in both the homogeneous and inhomogeneous cases. Numerical results indicate that turbulence fields can be generated with much smaller bases in comparison to synthetic Fourier methods while maintaining comparable accuracy. Adaptive generation of inhomogeneous turbulence is achieved by a scale reduction algorithm, which greatly reduces the computation cost and practically introduces no error. The generating formula issued in this research could be adjusted to generate fully inhomogeneous and anisotropic turbulence with given RANS data under divergence-free constraint, which was not achieved previously in similar research. Numerical examples shows that the generated homogeneous and inhomogeneous turbulence are in good agreement with the input data and theoretical results.
机译:这项研究提出了一种新的基于随机小波的湍流产生方法,并测试了在均匀和非均匀情况下产生的湍流场的各种特性。数值结果表明,与合成傅立叶方法相比,湍流场可以用更小的基数生成,同时保持相当的精度。通过比例缩减算法可以自适应生成不均匀湍流,从而大大降低了计算成本,并且几乎没有误差。在给定的RANS数据下,可以调整本研究中发布的生成公式,以在无散度约束下生成完全不均匀且各向异性的湍流,这在以前的类似研究中是无法实现的。数值算例表明,所产生的均匀湍流和非均匀湍流与输入数据和理论结果吻合良好。

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