Hydrodynamic Investigation of a Submarine Moving Under Free Surface

Abstract

Submerged bodies are commonly used in many fields such as scientific researches, military and commercial applications. Especially in military applications, submarines have a significant role as a silent and deterrent vehicle. Contrary to popular belief, submerged bodies also operate in shallow depth that free surface effects come into play. This causes the visual identification of submarines while protecting them from sonar detection. This study focuses on the investigation of free surface effects on submarine hydrodynamics moving forward in different depths. The numerical calculations have been conducted at different Reynolds numbers ranging from 1.5x10 7 to 3.5x10 7 for both bare and appended forms of DARPA Suboff. A commercial CFD solver has been used to solve URANS equations with k-ε turbulence model. The numerical approach has first been verified and validated with the available experimental data. Later, the numerical results have been discussed in terms of total resistance, resistance components and free surface deformations. It has been concluded that the submergence depth has a significant role on resistance components for depth Froude number larger than 0.7 and the appendages have little effect on free surface deformations in all depths.

Su Altı Araçlarının Manevra Karakteristiklerinin Değerlendirilmesi-II: Akışkan Sınırlarının Etkileri

“…Yazarlar ayrıca bu sonuçlardan yola çıkarak Fr<0.35 ve D*>2.2 koşullarında dalga yapma direncinin ihmal edilebileceğini belirtmişlerdir. (Doğrul, 2019) gerçekleştirdiği sayısal çalışmasında DARPA Suboff AFF-1 ve AFF-8 konfigürasyonlarını kullanmıştır. Yazar derinliğin ve takıntıların direnç bileşenlerine ve serbest yüzey deformasyonlarına etkisini incelemiştir.…”

Influence of Full and Symmetrical Domains on the Numerical Flow around a SUBOFF Submarine Model using OpenFOAM

“…A hydrodynamic investigation of a SUBOFF submarine model under free surface flow was carried out by Doğrul (2019). The free surface effects were taken into account at different Reynolds numbers and different depths.…”