采用FLUENT软件并选用VOF模型(Volume of Fluid model)对U形结构的水体振荡进行二维数值模拟,首先采用吴持恭推导的U形管中水体振荡周期公式验证采用数值模拟得到的结果可靠。然后研究U形结构的振荡特性,上下游横截面积对振荡周期、振...采用FLUENT软件并选用VOF模型(Volume of Fluid model)对U形结构的水体振荡进行二维数值模拟,首先采用吴持恭推导的U形管中水体振荡周期公式验证采用数值模拟得到的结果可靠。然后研究U形结构的振荡特性,上下游横截面积对振荡周期、振荡幅度的衰减及振荡过程中水流流态的影响。结果表明:增大U形结构上游或者下游横截面积会增大水体振荡周期,特别是同时增大上游与下游横截面积,效果更加显著;当中间有压管道的长度增加到一定程度以后,增加横截面积对周期造成的影响趋于一致,可以拟合出相应的公式;增加横截面积,特别是同时增加上下游横截面积造成水体中产生较大的水流漩涡,增大局部水头损失,能显著加快水体振荡的衰减。展开更多
The article studies the oscillation features of the water in the square moon pool under the circumstances of wave-flow combined conditions. Comparing with the results of experiments of the square moon pool, a series o...The article studies the oscillation features of the water in the square moon pool under the circumstances of wave-flow combined conditions. Comparing with the results of experiments of the square moon pool, a series of studies reveal that the water piston oscillation phenomenon is quite similar to that of the circular one. Two types of oscillation are exhibited under different incoming wave periods, i.e. self-excited oscillation and forced oscillation. The difference between the circular and square moon pool is that the attack angle makes greater influences on the square one. "Beating phenomenon" is also found in the square moon pool which is not mentioned of the circular one.展开更多
文摘采用FLUENT软件并选用VOF模型(Volume of Fluid model)对U形结构的水体振荡进行二维数值模拟,首先采用吴持恭推导的U形管中水体振荡周期公式验证采用数值模拟得到的结果可靠。然后研究U形结构的振荡特性,上下游横截面积对振荡周期、振荡幅度的衰减及振荡过程中水流流态的影响。结果表明:增大U形结构上游或者下游横截面积会增大水体振荡周期,特别是同时增大上游与下游横截面积,效果更加显著;当中间有压管道的长度增加到一定程度以后,增加横截面积对周期造成的影响趋于一致,可以拟合出相应的公式;增加横截面积,特别是同时增加上下游横截面积造成水体中产生较大的水流漩涡,增大局部水头损失,能显著加快水体振荡的衰减。
基金support of "111" project which was from China Education Department( No. B07019)
文摘The article studies the oscillation features of the water in the square moon pool under the circumstances of wave-flow combined conditions. Comparing with the results of experiments of the square moon pool, a series of studies reveal that the water piston oscillation phenomenon is quite similar to that of the circular one. Two types of oscillation are exhibited under different incoming wave periods, i.e. self-excited oscillation and forced oscillation. The difference between the circular and square moon pool is that the attack angle makes greater influences on the square one. "Beating phenomenon" is also found in the square moon pool which is not mentioned of the circular one.
