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首页> 外文期刊>International Shipbuilding Progress >Calculation of bottom clearance effects on Walrus submarine hydrodynamics
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Calculation of bottom clearance effects on Walrus submarine hydrodynamics

机译：底部间隙对海象潜水艇流体动力学影响的计算

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Due to changes in operations, the Royal Netherlands Navy (RNLN) is operating its submarines increasingly in brown water regions (i.e., waters with restriction in width and/or depth, such as littoral areas). To improve predictions for manoeuvring in restricted waterways, the RNLN has ordered the Maritime Research Institute Netherlands (MARIN) to conduct studies regarding the influence of the seabed on the behaviour of the submarine. In this work, viscous-flow calculations are used to predict the influence of bottom clearance on the hydrodynamic forces on the Walrus class submarines. The simulations representing unrestricted-water conditions have been validated with available model test results and good agreement was found. The details of the methodology and results of the viscous-flow calculations are presented in this article. The bottom clearance effects on hydrodynamic forces and moments are summarised. A strong non-linear influence of the bottom clearance on the vertical force and pitch moment was found. With a trim by the bow, the vertical down force can increase up to the same order of magnitude as the vertical up force that can be generated by the sail planes.
机译：由于作业方式的变化，荷兰皇家海军（RNLN）越来越多地在褐色水域（即，宽度和/或深度受限制的水域，例如沿海地区）操作其潜艇。为了改善对受限水道操纵的预测，RNLN已下令荷兰海事研究所（MARIN）进行有关海床对潜艇性能影响的研究。在这项工作中，粘性流计算用于预测海底间隙对海象级潜艇上流体动力的影响。代表无限制水条件的模拟已经通过可用的模型测试结果进行了验证，并且发现了很好的一致性。本文介绍了详细的方法和粘性流计算结果。总结了底部间隙对水动力和力矩的影响。发现底部间隙对垂直力和俯仰力矩有强烈的非线性影响。通过船首的修整，垂直向下的力可以增加到与帆面可能产生的垂直向上的力相同的数量级。

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