大型沉井拖航多迎流角水阻力数值模拟

Numerical simulation of large caisson towing resistance on different impacted angles

该文针对大型方沉井拖航过程中的水阻力计算问题,采用基于计算流体力学的方法,进行了不同流速和不同迎流角组合工况下沉井的拖航水阻力数值模拟。结果表明,大型方沉井的拖航水阻力随沉井拖航速度的增大而增加,且与速度的平方成一定正比例关系;沉井拖航速度对沉井所受压力分布情况影响不大,而迎流角是沉井所受压力分布重要影响因素;沉井的长宽比也是影响拖航阻力的重要因素之一;沉井内部吃水部分所受水阻力大小明显受到迎流角的变化影响,而且占总阻力比例最高可达15.85%,不可忽略。

To solve the towing resistance problem of the large open caisson, using computational fluid dynamics-based approach, numerical simulation is carried out on different conditions of different towing speed and impacted angles. The results show that the water resistance of towing large square caisson with increasing towing speed increases, and has a positive relation- ship with velocity squared; caisson towing speed has little effect on the caisson pressure distribution, but the impacted angle is important factor; caisson length width ratio is one of the important factors affecting towing resistance too; the resistance of caisson internal section is obviously influenced by impacted angles, and it＇s proportion of total resistance is up to 15.85%, it should not be ignored.