A Closure for Isotropic Turbulence Based on Extended Scale Similarity Theory in Physical Space

The closure of a turbulence field is a longstanding fundamental problem, while most closure models are introduced in spectral space. Inspired by Chou＇s quasi-normal closure method in spectral space, we propose an analytical closure model for isotropic turbulence based on the extended scale similarity theory of the velocity structure function in physical space. The assumptions and certain approximations are justified with direct numerical simulation. The asymptotic scaling properties are reproduced by this new closure method, in comparison to the classical Batchelor model.

丁丽仙教授治疗排卵期出血验案举隅

排卵期出血属于排卵性异常子宫出血的范畴,有研究表明其发病率约17%。排卵期出血不仅导致生殖系统疾病,还影响身心健康。文中主要介绍丁氏妇科第十代传人,名中医丁丽仙教授对排卵期出血病因病机的认识和灵活运用丁氏妇科滋阴清热止血方治疗排卵期出血取得显著疗效的经验。