Reynolds-averaged Navier-Stokes simulation of nearshore Langmuir circulation and the formation of oil-particle aggregates
Reynolds-averaged Navier-Stokes simulation of nearshore Langmuir circulation and the formation of oil-particle aggregates
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近岸朗缪尔环流和油颗粒聚集体形成的雷诺平均纳维-斯托克斯模拟
DOI：
10.1016/j.ocemod.2023.102306
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发表时间：
2024
期刊：
影响因子：
3.2
通讯作者：
Boufadel, M.C.
中科院分区：
文献类型：
--
作者：
Peñaloza-Gutierrez, J.J.;Tejada-Martínez, A.E.;Boufadel, M.C.
内陆架沿岸海洋中的朗缪尔湍流以朗缪尔环流(LC)或横跨整个未分层水柱深度的单体为特征。介绍了一种雷诺平均纳维斯托克斯(RANS)模拟策略，该策略将全深度LC与油粒聚集体(OPA)形成模型相耦合。可以看到，在风暴条件下，风浪产生的全深度LC可以导致沉积物再悬浮和油滴夹带(在发生漏油的情况下)，并随后在两者之间混合，导致大量的OPA形成。这一结论来自于一项模拟，在模拟中，各种类型的油滴(直径在40到140kgm之间)在表面释放，每种类型的油滴初始浓度为0.1%μ−3。全深度LC导致大部分石油在前5分钟内被困在Opas内。大多数较大的油滴与近地表的沉积物迅速聚集，而较小的油滴首先被朗缪尔环流下沉的支淹没，最终与沉积物聚集在一起，同时被上升支向上携带。随着时间的推移，较重的欧帕斯最终在细胞的上升支部内沉降，同时慢慢地沉积到床上。
Langmuir turbulence in the inner shelf coastal ocean is characterized by Langmuir circulation (LC) or cells that can span the full depth of unstratified water columns. A Reynolds-averaged Navier-Stokes (RANS) simulation strategy resolving full-depth LC coupled with an oil-particle aggregate (OPA) formation model is introduced. It is seen that full-depth LC generated by wind and waves under storm conditions can result in sediment resuspension and oil droplet entrainment (in the case of an oil spill) and subsequent mixing between these two, leading to significant OPA formation. This conclusion comes from a simulation in which various classes of oil droplets (with diameters ranging between 40 and 140 μm) were released at the surface, each class initialized with a 0.1 kgm−3concentration. The full-depth LC led to most of the oil becoming trapped within OPAs in the first 5 min. The majority of the larger oil droplets were quickly aggregated with sediments near surface, whereas the smaller oil droplets were first submerged by the downwelling limbs of the Langmuir cells, and eventually aggregated with sediment while being carried upwards by the upwelling limbs. The OPAs conglomerated in the form of clouds transported by the action of the cells, with the heavier OPAs eventually settling within the upwelling limb of the cells while slowly depositing to the bed over time.