ABSTRACT

Numerical simulations are performed to study the interaction between propeller and hull for two planing vessels: a hard-chine and a tunnelled craft. The numerical model used for reproduction of the problem is validated by comparing the obtained results against published data, showing that a morphing technique is more reliable compared to an overset one. It is demonstrated that propellers strongly affect the performance of a vessel by increasing trim angle and decreasing resistance, which are caused by a noticeable pressure reduction occurring near propellers. These changes are more significant for the case of a tunnelled hull since hydrodynamic pressure acting on the bottom of this vessel is larger compared to a hard-chine craft. While resistance of hulls is seen to be influenced by variation in the position of the propellers at early-planing mode, trim angle is seen to be insensitive to the position of propellers at all speeds.

摘要

进行数值模拟以研究两种滑行船的螺旋桨和船体之间的相互作用：硬脊船和隧道船。用于重现问题的数值模型通过将获得的结果与公布的数据进行比较来验证，表明变形技术比重叠技术更可靠。研究表明，螺旋桨会通过增加纵倾角和减小阻力来强烈影响船舶的性能，这是由螺旋桨附近发生的显着压力降低引起的。这些变化对于隧道船体的情况更为显着，因为与硬船相比，作用在该船底部的流体动压更大。虽然可以看出船体的阻力受早期滑行模式下螺旋桨位置变化的影响，