发表机构
Principle Department, Su-Cheng Center for Fundamental and Interdisciplinary Sciences; College of Meteorology and Oceanography, National Defence University（苏成基础与交叉科学中心原理系; 国防大学气象海洋学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究结合绝对统计平衡与声类比，探究螺旋度对两类实舒尔流及自由舒尔流的声辐射远场指向性的影响，发现螺旋度会放大降维诱导的指向性各向异性且模式不同。
AI 中文摘要
各向异性湍流的统计描述与声学诊断仍是难题。实舒尔流（Real Schur flows，RSFs）是分量降维流（component-wise dimensionally reduced flows，CWDRFs）的原型模型，为研究此类问题提供了有效平台。我们结合绝对统计平衡与声类比，探究螺旋度对三类CWDRFs（两种不同的RSF及它们进一步降维得到的自由舒尔流）辐射远场声指向性的影响。通过绝对平衡高斯系综的维克定理计算涡声源谱，以此评估指向性。结果表明，螺旋度会放大所有CWDRFs中降维诱导的指向性函数各向异性，且呈现出不同模式。
英文摘要
The statistical description and acoustic diagnostics of anisotropic turbulence remain challenging. Real Schur flows (RSFs), prototype models of component-wise dimensionally reduced flows (CWDRFs), provide effective platforms for studying such problems. We combine absolute statistical equilibrium with the acoustic analogy to investigate helicity effects on the far-field directivity of sound radiated from three types of CWDRFs: two different RSFs, and a further reduction of them (liberated Schur flow). We evaluate the directivity from the vortex-sound source spectrum which is calculated with the Wick theorem from the absolute equilibirum Gaussian ensemble. Helicity amplifies the dimensional reduction induced anisotropy of the directivity functions across all CWDRFs, with distinct patterns.
