斜坡上的密度流数值模拟研究

发布时间：2018-05-27 19:16

本文选题：密度流 + 斜坡　；参考：《长江科学院院报》2017年07期

【摘要】：为了探讨均匀密度环境水体中斜坡密度流的运动规律,建立了立面二维RNG k-ε紊流数学模型,通过与已有试验资料对比,验证了该模型的合理性与准确性。利用该模型模拟不同坡角和流量下的斜坡密度流,研究结果表明:密度流头部流速与坡角具有一定的函数关系,存在一个最优坡角使得相同条件下的头部流速最大;头部流速与浮力通量的三次方根之间并非严格的正比例函数关系,在流量较小或较大时将发生偏离;密度流运动过程中,头部形态不断扩大,头部的厚长比逐渐减小;头部扩大的速率随着坡角和流量的增大而增大,最后逐渐趋于一个稳定速率。研究结果能够帮助进一步了解斜坡密度流的运动规律。
[Abstract]:In order to study the motion law of density flow on slope in uniform density environment, a two-dimensional RNG k- 蔚 turbulent mathematical model for vertical plane is established. The rationality and accuracy of the model are verified by comparing with the experimental data. The model is used to simulate the density flow of the slope under different slope angles and flows. The results show that the velocity of the head of the density flow has a certain function relationship with the angle of the slope, and there is an optimal slope angle to make the maximum velocity of the head of the density flow under the same conditions. The relationship between the head velocity and the root of buoyancy flux is not a strict positive function, which will deviate when the flow rate is small or larger, and the head shape is enlarged and the ratio of head thickness to length decreases gradually during the movement of density flow. The rate of head expansion increases with the increase of slope angle and flow rate, and finally tends to a stable rate. The results of the study can help to further understand the motion of slope density flow.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;中国长江三峡集团公司;
【分类号】：TV131

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