Effect of Waves on the Behavior of Emergent Buoyantly Rising Submarines Using CFD

Abstract

Emergent buoyantly rising submarines encounter excess roll problems, partially owing to waves that significantly affect their behavior. This study predicts the behavior of a submarine, including when it rises in static water, beam sea, head wave, following wave, 30∘ bow wave, 60∘ bow wave, 30∘ quartering wave, and 60∘ quartering wave, using the computational fluid dynamics method. The beam sea has a slight effect on pitch prior to the submarine rising to the water surface, but the maximum roll angle in the beam sea is 4.43 times that in static water. After a submarine submerges in water, the pitching oscillation does not decay quickly owing to the yaw angle. The head wave and the following wave have a continuous significant effect on the pitch; the submarine sail remains under the water surface after it submerges from the highest position. The head wave and the following wave have a slight effect on the roll and yaw before the submarine rises to the water surface; however, the roll angle suddenly increases after the submarine submerges from the highest position. As the initial angle between the submarine centerline and wave direction increases, the effect of waves on the longitudinal motion decreases. The amplitude of the pitching oscillation decreases with an increase in the initial angle between the submarine centerline and wave direction, and the waterline when the submarine oscillates on the water surface decreases. The difference in the maximum roll angle between when a submarine rises in an oblique wave and when it rises in beam sea is below 6.3∘. Submarines should try to avoid rising in a head wave and the following wave.

Steering and Rising Testing of an Innovative Tourist Submarine

“…Model tests and numerical simulation results revealed the strong coupling between roll and yaw motions when ascending [22]. An optimised controller of the rudders was proposed, which reduced the maximum roll angle by up to 96% in some simulated cases.…”

Влияние Горизонтальных И Вертикальных Рулей На Характер Движения Погруженного Тела В Приповерхностной Водной Среде

“…Для этой же модели субмарины исследовано влияние на ее гидродинамические характеристики формы геометрии носовой оконечности и положения рубки относительно мидель-шпангоута [16]. Изучено влияние волнения на процесс всплытия субмарины [6,17] Очевидно, что выступающие части также оказывают влияние на характер движения погруженного тела, а именно на вертикальное перемещение, возникающее под воздействием подъемной силы F z , и угол дифферента. Экспериментальное измерение этих параметров с помощью традиционного метода буксировки моделей на вертикально или горизонтально расположенном пилоне и жестко закрепленном на буксировочной тележке не реализуемо.…”