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Experimental and numerical investigation of squat submarines hydrodynamic performances

Sarraf, S ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.oceaneng.2022.112849
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. This paper empirically examines the hydrodynamic performances of squat submarines under the resistance and wave tests beside numerical investigation of pressure drag reduction techniques. Despite vast information about the operation of the streamlined fluid vessels, there is not much information about the geometries and hydrodynamic behaviors of squat vessels with L/D ratios below four. This study experimentally investigates the impacts of various relative depths and flow inclinations, intending to find drag, heave, and sway forces at the velocities of 0.5, 1.0, 1.5, 2.0, and 2.5-m/s. A one-tenth scaled model of a squat submarine is examined under the resistance and wave train scenarios as the captive model in the towing tank experiments via 110 unique testing scenarios. Then, different pressure drag reduction techniques on the full-scale submarine are evaluated numerically at one-phase fluid by developing stern geometric optimization, nose rod devices, water corridors, and surface patterns at the bow and stern. Results present drag forces increase up to 150% at the 0.5D level for the resistance and wave tests due to the influences of the free surface water. The drag coefficients at the fully submerged depth of 6D differ by up to 13.3% between the numerical and experimental evaluations. © 2022 Elsevier Ltd
  6. Keywords:
  7. Drag reduction ; Squat submarine ; Submarine ; Towing tank test ; Wave ; Hydrodynamics ; Surface waters ; Tanks (containers) ; Experimental investigations ; Hydrodynamics performance ; Numerical investigations ; Pressure drag ; Reduction techniques ; Resistance tests ; Submarine hydrodynamics ; Towing-tank tests ; Wave test ; Submarines ; Drag ; Experimental study ; Flow pattern ; Flow velocity ; Numerical method ; Performance assessment ; Testing method ; Wave force
  8. Source: Ocean Engineering ; Volume 266 , 2022 ; 00298018 (ISSN)
  9. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85140080627&doi=10.1016%2fj.oceaneng.2022.112849&partnerID=40&md5=8567324c3a680f34ef0e33a393ca6ff4