A computational fluid dynamics study
A computational fluid dynamics study
复制标题
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
K. Age
中科院分区：
文献类型：
--
作者：
K. Age
应用计算流体力学软件OpenFoam对驳船的死水阻力进行了研究。死水阻力是由于咸水和淡水之间的界面上的内波造成的额外阻力。当弗劳德数小于1.5时，弗劳德数与死水阻力呈倒U形关系。在倒U型范围以下和上方，死水阻力很小。死水阻力的峰值位于Fr 0.6-0.7的范围内。死水阻力大小随吃水与跃层比的增大而增大。对于吃水到跃层等于1的情况，由于内波的作用，阻力增加了21%。在我们的模拟中，k-−ω模型没有给出稳定的阻力系数。K−ω海温模式给出了定常阻力系数。静水阻力在很大程度上取决于驳船尾部以下的内波面高度。压力阻力是死水阻力背后的主要驱动因素。对于最大的吃水/跃层比为1，表面摩阻只对死水阻力有正向贡献。
Applying the computational fluid dynamics software openFoam, we study dead water resistance on a barge. Dead water resistance is the extra drag due to internal waves in the interface between salt water and fresh water. For Froude numbers below 1.5, we find an inverted U-shape between the Froude number and dead water resistance. Below and above the inverted U-shape range, the dead water resistance is small. The peak in dead water resistance is located in the range Fr 0.6-0.7. The size of dead water drag grows with the ratio of draft to pycnocline. For a draft to pycnocline equal to one, the drag increases by 21 percent due to the internal wave. The k − ω model does not give steady drag coefficients in our simulations. The k − ω SST model gives steady drag coefficients. The dead water drag is to a large degree dependent on the internal wave surface elevation below the stern of the barge. Pressure drag is the main driver behind the dead water drag. The skin friction only contributes positively to the dead water drag for the largest draft to pycnocline ratio, which equals one.