Journals / Journal of Eta Maritime Science / 2019 / Cilt: 7 - Sayı: 3

Hydrodynamic Investigation of a Submarine Moving Under Free Surface

Serbest Yüzey Altında İlerleyen Bir Denizaltının Hidrodinamik Açıdan İncelenmesi

Pages
212–226
Publication Date
2022-10-18
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

It has been concluded thatthe submergence depth has a significant role on resistance components for depth Froude number larger than0.7 and the appendages have little effect on free surface deformations in all depths.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Submerged bodies are commonly used in many fields such as scientific researches, military and commercialapplications.
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Key Findings & Data:Especially in military applications, submarines have a significant role as a silent and deterrentvehicle.
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Conclusion & Impact:It has been concluded thatthe submergence depth has a significant role on resistance components for depth Froude number larger than0.7 and the appendages have little effect on free surface deformations in all depths.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Submerged bodies are commonly used in many fields such as scientific researches, military and commercialapplications. Especially in military applications, submarines have a significant role as a silent and deterrentvehicle. Contrary to popular belief, submerged bodies also operate in shallow depth that free surface effectscome into play. This causes the visual identification of submarines while protecting them from sonardetection. This study focuses on the investigation of free surface effects on submarine hydrodynamics movingforward in different depths. The numerical calculations have been conducted at different Reynolds numbersranging from 1.5x107 to 3.5x107 for both bare and appended forms of DARPA Suboff. A commercial CFD solverhas been used to solve URANS equations with k-ε turbulence model. The numerical approach has first beenverified and validated with the available experimental data. Later, the numerical results have been discussedin terms of total resistance, resistance components and free surface deformations. It has been concluded thatthe submergence depth has a significant role on resistance components for depth Froude number larger than0.7 and the appendages have little effect on free surface deformations in all depths.

Özet

Batmış cisimler araştırma, askeri ve ticari uygulamalar gibi pek çok alanda yaygın bir şekilde kullanılmaktadır. Özellikle askeri uygulamalarda denizaltılar sessiz ve caydırıcı bir araç olarak önemli bir role sahiptir. Sanılanın aksine, batmış cisimler serbest yüzey etkilerinin devreye girdiği sığ derinlikte de çalışmaktadır. Bu durum denizaltıları sonar tespitinden korurken görsel olarak tespit edilmelerine sebep olmaktadır. Bu çalışma farklı derinliklerde ilerleyen denizaltının hidrodinamiğine serbest yüzey etkilerinin incelenmesine odaklanmaktadır. Sayısal hesaplamalar 1.5x107ile 3.5x107arasındaki Reynolds sayılarında takıntısız ve takıntılı DARPA denizaltısı için yapılmıştır. Ticari bir yazılım yardımıyla URANS denklemleri k-ε türbülans modeli kullanılarak çözülmüştür. Sayısal yöntem ilk önce eldeki deneysel veri ile doğrulanıp onaylanmıştır. Daha sonra sayısal sonuçlar, toplam direnç, direnç bileşenleri ve serbest yüzey deformasyonları açısından değerlendirilmiştir. Sonuç olarak derinlik Froude sayısının 0.7’den büyük olduğu durumlarda derinliğin dirence önemli bir etkisinin olduğu ve tüm derinliklerde takıntının serbest yüzey deformasyonuna etkisinin çok az olduğu görülmüştür.

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Cite This Article

DOĞRUL, A. (2022). Hydrodynamic Investigation of a Submarine Moving Under Free Surface. Journal of Eta Maritime Science, Cilt: 7 - Sayı: 3, 212–226. https://ajindex.com/articles/562833

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