turbulent drag

The magnitude and diurnal variation of the turbulent drag coefficient CD and bulk transport coefficient of heat ( or moisture) flux, CH ( or CE).

利用气象铁塔的风、温梯度资料，对陆面上近地层湍流拖曳系数CD和总体输送系数CH（或CE）的大小和日变化规律进行研究。

Effective section of cold-formed steel purlins With concepts of joint flow field and the effective section thrust and the strip turbulent boundary layer theory, an improved drag calculation can be obtained.

本文采用联合流场、有效剖面吸力概念以及顺流向片条作可压缩紊流附面层的积分解，来改进阻力特性的数值计算。数值方法已编制成计算程序。

The present study indicates introduction and utilization of new drag coefficients, which are able to represent the particle concentration effect, provide an efficient means to improve the numerical prediction of turbulent jets laden with particles and, probably, other two-phase flows.

结果还表明，反映颗粒体积率等影响的阻力系数公式的引入和使用是改善两相湍射流流动特性的预测的有效途径之一。

Through the numerical simulation investigation, the turbulent drag redaction mechanism above shark riblets surface was explored.

通过对鲨鱼沟槽表面特殊流场的数值仿真研究, 探讨了沟槽表面存在减阻效果的内在机理.

Based on theoretical analysis, microbubble drag reduction is due to structure change of turbulent boundary layer caused by the microbubbles.

理论分析提出微气泡降阻机理在于其引起湍流边界层结构的变化；