Numerical Calculation of maneuvering Damping and Added Mass Coefficients of an Autonomous Underwater Vehicle up to Third Order using Finite Volume Method

One of the most prevalent ways for studying the submarine’s hydrodynamic behavior, like maneuvering, is calculating the hydrodynamic coefficients the hydrodynamic coefficients. In this paper calculation of hydrodynamic coefficients (up to third order) of an AUV using Computational Fluid Dynamics (CFD) and Finite Volume Method(FVM) was performed. Therefore, a Myring body was chosen to simulate the unsteady maneuvering for surge, sway and yaw motions. The turbulence effects were modeled by k-ω sst turbulent model. The Planar Motion Mechanism (PMM) in two situations has been implemented to calculate the forces and moments for sway and yaw motions. Creating body motions in computational domain, the Overset mesh was used. Furthermore, the grid study was performed for investigating of the simulation accuracy. Then for calculating the coefficients, some six order polynomial equations were interpolated for forces and moments versus velocity and acceleration. The numerical results were compared with the results of (Prestero, 2001) . The relevant error for damping coefficients was between 0.8 to 12 percent. These values for added mass coefficients were between 0.8 to 37 percent.