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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。
Aiming at the calculation of water resistance during the towing process of large square caisson, the numerical simulation of the towing water resistance of caisson under different combinations of flow rates and different heading angles was carried out by the method of computational fluid dynamics (CFD). The results show that the resistance of towed water in large square caisson increases with the increase of tow caisson speed, and is proportional to the square of the speed. The caisson towing speed has little effect on the pressure distribution in caisson , While the angle of incidence is an important factor affecting the pressure distribution in the caisson. The aspect ratio of caisson is also one of the important factors that affect the drag resistance. The water resistance of draft part in the caisson is obviously affected by the change of the angle of incidence Influence, but also the total resistance ratio up to 15.85%, can not be ignored.