Direct numerical simulation of equilibrium spatially localized structures in pipe flow
Direct numerical simulation of equilibrium spatially localized structures in pipe flow
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管流平衡空间局部结构的直接数值模拟
DOI：
10.1063/1.1804549
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发表时间：
2004
影响因子：
4.6
通讯作者：
T. Miyazaki
中科院分区：
文献类型：
--
作者：
V. G. Priymak;T. Miyazaki
从原理上说明了用三维非定常长波Navier-Stokes解描述间歇性湍流剪切流的可能性。本文以转捩雷诺数为1800 ~ 4000的粘性不可压缩流体圆管流动的经典问题为模型。通过直接数值模拟，得到了描述湍流（Re = 2500 ~ 4000）、间歇流（Re= 2200，2350）和层流（Re = 2000）的统计定常Navier-Stokes解。Re= 2200，2350时的数值解描述了平衡自持流态，在这种流态中，被层流包围的湍流结构向下游传播，同时保持其长度。因此，理论上确认存在特定的过渡流制度平衡泡芙实现。平衡泡芙的时空结构进行了检查，特别强调流动可视化和计算的传播速度。基本湍流状态
The possibility of intermittent turbulent shear flows’ description by means of nonstationary long-wave three-dimensional Navier–Stokes solutions is shown in principle. The classical problem of viscous incompressible fluid flows in a circular pipe at transitional Reynolds numbers 1800⩽Re⩽4000 is taken as a model one. By means of direct numerical simulation statistically stationary Navier–Stokes solutions which describe turbulent (at 2500⩽Re⩽4000), intermittent (at Re=2200,2350), and laminar (Re⩽2000) flow regimes are obtained. Numerical solutions at Re=2200,2350 describe equilibrium self-sustained flow regimes in which turbulent structures surrounded by almost laminar flow propagate downstream while preserving their length. Thus, theoretical confirmation of the existence of particular transitional flow regimes—equilibrium puffs—is achieved. The space-time structure of equilibrium puffs is examined with particular emphasis on flow visualization and calculation of propagation velocities. Basic turbulence sta...
DOI：
10.1146/annurev.fl.19.010187.002011
发表时间：
1987
期刊：
--
影响因子：
--
作者：
C. Canuto;M. Hussaini;A. Quarteroni;T. Zang
通讯作者：
C. Canuto;M. Hussaini;A. Quarteroni;T. Zang