Double-averaged kinetic energy budgets in flows over mobile granular beds: insights from DNS data analysis
Double-averaged kinetic energy budgets in flows over mobile granular beds: insights from DNS data analysis
复制标题
移动颗粒床流动中的双平均动能预算：来自 DNS 数据分析的见解
DOI：
10.1080/00221686.2019.1661291
复制
发表时间：
2019
影响因子：
2.3
通讯作者：
Papadopoulos K
中科院分区：
文献类型：
--
作者：
Papadopoulos K
本文采用双平均、形式诱导和空间平均湍流能量收支方程，对具有中间水流淹没的过渡粗糙移动床上的明渠湍流直接数值模拟数据进行了分析。两种情况被认为与(i)接近临界床况和（ii）完全移动床况有关。床是由一层可移动的球形颗粒在一层相同大小的固定颗粒的顶部移动组成的。数据分析表明，双平均、形式诱导、湍流流场贡献和粒子运动之间的能量交换是主要的。在固定颗粒顶部以上，湍流直接从平均流和移动床层颗粒处获得动能，而移动床层颗粒又从平均流处获得能量。在近临界床层条件下，颗粒聚集增强了平均流动非均匀性，增强了湍流应力及其对流动的影响，而在床层迁移率增加时，能量输运机制减弱，粘性应力和压力诱导的转换增强。
The equations for double-mean, form-induced and spatially averaged turbulent energy budgets are employed to analyse data from direct numerical simulations of turbulent open-channel flows over transitionally rough mobile beds with intermediate flow submergence. Two scenarios were considered related to (i) near-critical bed condition, and (ii) fully mobile bed condition. The bed was composed of a layer of mobile spherical particles moving on the top of one layer of fixed particles of the same size. Data analysis showed the leading energy exchanges between double-mean, form-induced, turbulent flow field contributions as well as particle motions. Above the fixed particles tops, the turbulent flow receives kinetic energy directly from the mean flow as well as from moving bed particles, which in turn also receive energy from the mean flow. For near-critical bed condition, particle aggregations enhanced mean-flow heterogeneity, strengthened turbulent stresses and their effects on the flow, while at increased bed-mobility, energy transport mechanisms became weaker and conversions induced by viscous stresses and pressure became stronger.
登录
查看更多内容
DOI：
10.1002/pamm.201210241
发表时间：
2012
期刊：
PAMM
影响因子：
--
作者：
B. Vowinckel;J. Fröhlich
通讯作者：
J. Fröhlich
影响因子：
3.8
作者：
Tobias Kempe;B. Vowinckel;J. Fröhlich
通讯作者：
Tobias Kempe;B. Vowinckel;J. Fröhlich
DOI：
10.1016/s0017-9310(00)00202-7
发表时间：
2001-03
影响因子：
5.2
作者：
Marcos H. J. Pedras;M. D. Lemos
通讯作者：
Marcos H. J. Pedras;M. D. Lemos
湍流明渠流中的流体颗粒与完全解析的移动床的相互作用
影响因子：
4.7
作者：
B. Vowinckel;T. Kempe;J. Fröhlich
通讯作者：
J. Fröhlich
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
B. Vowinckel;Tobias Kempe;J. Fröhlich;V. Nikora
通讯作者：
V. Nikora