Decaying turbulence in neutral and stratified fluids
Decaying turbulence in neutral and stratified fluids
复制标题
中性和分层流体中的衰减湍流
DOI：
10.1017/s002211208000047x
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发表时间：
1980
影响因子：
3.7
通讯作者：
G. Mellor
中科院分区：
文献类型：
--
作者：
T. Dickey;G. Mellor
中性和分层流体中的衰减湍流已通过实验研究了相对较高的网格雷诺数和较长的时程。中性情况表明初始周期衰减定律 q2∝ t−1，通过无量纲时间 \[ W_gt/M \simeq 800 \]，这比相同网格雷诺数 (Re = 48260) 的先前测量要长得多。分层实验产生的衰减率实际上与中性情况相同（Wgt/M = 275）。然而，当湍流场被内部重力波取代时，衰减率急剧下降。临界理查森数标志着从湍流到内部重力波域的转变。
Decaying turbulence in neutral and stratified fluids has been studied experimentally for relatively high mesh Reynolds numbers and long time-histories. The neutral case indicates an initial period decay law, q2∝ t−1, through non-dimensional time \[ W_gt/M \simeq 800 \] which is considerably longer than previous measurements at the same mesh Reynolds number (Re = 48260). The stratified experiment resulted in a decay rate virtually identical to that of the neutral case through Wgt/M = 275. However the decay rate sharply decreased after this time when the field of turbulence was replaced by internal gravity waves. A critical Richardson number marks the transition from the turbulence to an internal gravity wave domain.