Abstract:

Unmanned Underwater Vehicles (UUV) are frequently used today for ocean and submarine exploration. The hydrodynamic properties of UUV's moving close to the water surface are quite different from those moving at deeper depths. In this article, an UUV's has done at different depths (0.5 m, 1 m, 1.5 m, 2 m and 2.5 m) and velocities (0.1 m/s, 0.5 m/s and 1 m/s) in horizontal and vertical directions, during the movements, the hydrodynamic drag forces,, the lift forces acting on the hull and the drag and lift coefficients depending on these were tried to be determined. The aim of the study is to observe the effects of depth and flow velocity on hydrodynamic parameters by using Computational Fluid Dynamics (CFD) analysis methods. The accuracy of the values obtained from numerical analyzes was tried to be proven by conducting experimental studies. In the simulations for analysis, a three-dimensional CAD model of the four-degrees-of-freedom UUV, which was developed with the infrastructure support of the Kocaeli University Scientific Research Projects (KOU-SRP) unit, numbered 2018-108, was used. Flow Simulation commercial software is a CFD software interoperable with SolidWorks and utilizes the solution of Navier Stokes equations for laminar and turbulent flow analysis. In this study, the Flow Simulation k-ε turbulence model was used for the transition from laminar flow to turbulent flow.