记录扰动场的二维山包绕流的数值分析

Numerical Analysis of 2D Parabolic Flow in Recording Disturbance Field

首先采用k-ε模型对二维山包绕流进行试算,并拿计算结果与实验结果相比对,发现数值模拟与实验结果基本一致。验证完计算方法后在充分发展入流段加入X方向和Y方向两种不稳定的扰动场,经过计算之后用其结果对比实验数据,发现数值模拟与实验结果相差较大,在X方向加入扰动场之后发现漩涡出现后移现象,加入Y方向的扰动场之后,漩涡也出现了脱离山包顶端的现象,而且加入扰动场之后的漩涡中心位置也发生了较大变化。由于在现实中山包入流处的流速并非单一的,加入扰动场之后的计算结果为实际山地工程提供了数值依据。

We first use the k-ε model to test the 2D parabolic flow,and compare the results with the experimental results. It is found that the calculated results are in good agreement with the experimental results. After verifying the calculation method,adding two kinds of unstable disturbances with the X direction and the Y direction in the full development of the inflow section. After the calculation,the experimental data were compared with the results,and it found that the experimental results are different from the numerical simulation. After adding the disturbance field in the X direction,it is found that the vortex appears to move backward. After adding the Y direction of the disturbance field,it is found that the whirlpool appeared from the top of the mountain. Due to thereality that the mountain bag into the flow rate is not single,and the results of this article after adding the disturbance field provide the numerical basis for the actual mountain engineering.