Multiphase particle method using an elastoplastic solid phase model for the diffusion of dumped sand from a split hopper
Multiphase particle method using an elastoplastic solid phase model for the diffusion of dumped sand from a split hopper
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DOI：
10.1016/j.compfluid.2020.104639
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发表时间：
2020-06
影响因子：
2.8
通讯作者：
H. Ikari;Takashi Yamano;H. Gotoh
中科院分区：
文献类型：
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作者：
H. Ikari;Takashi Yamano;H. Gotoh
为了在沿海地区进行有效的围垦，有必要准确地预测漏斗驳船倾倒的大量沙粒的扩散和沉积范围。以往的许多研究都提出了有用的模型来模拟沙子在流体中的扩散行为，但大多数模型都没有考虑沙子的沉积。本研究提出了一个考虑流沙相互作用的基于颗粒的数值模型。该模型使用两种方法来跟踪沙子：沙层的弹塑性模型和悬浮泥沙的平流扩散模型。这两种砂子追踪技术能够更准确地评估从漏斗内部到海底的一系列砂子过程中的扩散和沉积。利用流体和饱和砂土进行了溃坝模拟，验证了模型的有效性。在这一验证中，比较了溃坝水流的跳动距离和最终的泥沙淤积形态的时程，它们与以前的实验结果吻合得很好。之后，我们进行了从分体式漏斗中倾倒沙子的实验，并利用实验结果对模型进行了验证。对模型的性能进行了检验，重点考察了悬浮泥沙的扩散、流体的速度场和沙粒的沉积。计算结果揭示了排沙引起的水流特性。
It is necessary to accurately predict the diffusion and deposition range of a large amount of sand dumped from a hopper barge for efficient reclamation in a coastal area. Many previous studies have proposed useful models to simulate the diffusion behavior of sand in fluid; however, most of their models have not considered the deposition of sand. This study proposes a particle-based numerical model that includes fluid-sand interaction. The model utilizes two methods to track the sand: an elastoplastic model for a sand layer and an advection-diffusion model for suspended sediments. These two techniques for sand tracking enable the evaluation of diffusion and deposition more accurately in a series of sand processes from inside the hopper to the seafloor. The proposed model was validated with a dam-break simulation using fluid and saturated sand. In this validation, the time histories of the runout distance of the dam-break flow and the final deposition shape of the sand were compared, and they agreed well with previous experimental results. Thereafter, we conducted an experiment in which sand was dumped from a split hopper, and the model was validated using the results of this experiment. The performance of the model was examined, focusing on the spread of the suspended sediments, the velocity field of the fluid, and the deposition of sand. The flow characteristics induced by the dumped sand were revealed from the calculated results.