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现有的环流修正模型多通过对单弯道或曲率较小的连续弯道的水流模拟来验证,其对曲率较大的连续弯道或天然河道水流模拟的适用性有待进一步分析。为解决这一问题,该文将修正模型应用于曲率较大及与天然河道平面形态相近的变曲率连续弯道的水流模拟中,来检验修正模型的适用性并分析修正项的作用。结果表明:修正模型模拟的水深略高于非修正模型,纵向水深平均流速与实测值更接近,在壁面附近尤为明显。通过对修正项的分析得出,修正项的量级与黏性项量级相当,其作用不可忽略,且在壁面附近对流速的修正作用最明显。通过分析表明,该文所采用的修正模型对曲率较大的连续弯道的水流模拟具有一定的适用性,对壁面附近流速模拟精度的提高使得本文修正模型更适用于弯道横向演变的模拟研究。
The existing circulation correction model is mostly verified by simulating the flow of single curves or small continuous curves. The applicability of continuous curves with large curvature or natural river flows needs to be further analyzed. In order to solve this problem, this paper applies the modified model to simulate water flow in continuous curvature with large curvature and close to the natural channel plane to test the applicability of the modified model and analyze the effect of the correction term. The results show that the water depth simulated by the revised model is slightly higher than that of the unmodified model, and the average velocity of water depth in the longitudinal direction is closer to the measured value, especially near the wall. Through the analysis of correction items, it is found that the magnitude of corrections is of the same order of magnitude as that of viscous terms, and its effect can not be neglected. The correction effect on the velocity of flow near the wall is the most obvious. The analysis shows that the modified model adopted in this paper has some applicability to the flow simulation of continuous curved road with large curvature. The improvement of simulation accuracy of velocity near the wall makes the modified model of this paper more suitable for simulating the lateral evolution of curved corners .