Turbulent pipe flow response to a step change in surface roughness
Turbulent pipe flow response to a step change in surface roughness
复制标题
湍流管流对表面粗糙度阶跃变化的响应
DOI：
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发表时间：
2020
影响因子：
3.7
通讯作者：
A. Smits
中科院分区：
文献类型：
--
作者：
T. Van Buren;D. Floryan;L. Ding;L. Hellström;A. Smits
Abstract The long-lasting response of turbulent pipe flow to a step change in surface roughness from rough to smooth is examined. Global flow characteristics such as the pressure gradient, skin friction and mean streamwise momentum attain their equilibrium values within approximately 20 radii downstream of the step change, but the turbulent stresses are exceedingly slow to adjust to the new wall condition (${>}120 extrm {radii}$), and they first fall below their equilibrium values before seemingly asymptoting to the full recovery state. To help understand this response, we develop a model that captures both the long development length and the second-order response of the turbulence, and we use a scale decomposition to connect the large-scale motions to the response behaviour.
壁粗糙度发生阶跃变化后湍流边界层的发展
影响因子：
3.7
作者：
Hanson R
通讯作者：
Hanson R