摘要
To analyze the effect of the way of water entry on water impact, the FLUENT software was adopted to simulate a two-dimensional (2D) helicopter V-buoy’s free fall and forced fall at a constant velocity.Combining with the UDF program and the dynamic mesh model, the standard k-ε turbulence model was used and the VOF technique was adopted to capture free surface.The physical parameters such as velocity and force were calculated and compared with those results of boundary element method with good agreement obtained.It was found that the force of 2D V-buoy at a constant velocity was much greater than that in free fall motion.Meanwhile, the maximum pressure coefficients C p max in both cases were almost equal and the dimensionless water-entry depths y' corresponding to C p max were also similar.
To analyze the effect of the way of water entry on water impact, the FLUENT software was adopted to simulate a two-dimensional（2D） helicopter V-buoy’s free fall and forced fall at a constant velocity. Combining with the UDF program and the dynamic mesh model, the standard k-ε turbulence model was used and the VOF technique was adopted to capture free surface. The physical parameters such as velocity and force were calculated and compared with those results of boundary element method with good agreement obtained. It was found that the force of 2D V-buoy at a constant velocity was much greater than that in free fall motion. Meanwhile, the maximum pressure coefficients Cpmax in both cases were almost equal and the dimensionless water-entry depths y’ corresponding to Cpmax were also similar.
基金
Sponsored by the National Natural Science Foundation of China(Grant Nos.51639004 and 51579054)
