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CFD Based Added Mass Prediction in Cruise Condition of Underwater Vehicle Dynamic

Moelyadi M.A.a, Riswandi B.B.a

a Department of Aeronautics and Astronautics, Faculty of Mechanical and Aerospace Engineering, Bandung Institute of Technology, Indonesia

Abstract

© Published under licence by IOP Publishing Ltd.One of the unsteady flow behavior on the hydrodynamic characteristics of underwater vehicle is the presence of added mass. In cruising conditions, the underwater vehicle may require the addition of speed or experience the disturbance in the form of unsteady flow so that cause the hydrodynamic interaction between the surface of the vehicle with the surrounding fluid. This leads to the rise of local velocity of flow and the great changes of hydrodynamic forces which are very influential on the stability of the underwater vehicle. One of the result is an additional force called added mass. It is very useful parameter to control underwater vehicle dynamic.This paper reports the research on the added mass coefficient of underwater vehicles obtained through the Computational Fluid Dynmaic (CFD) simulation method using CFX software. Added mass coefficient is calculated by performing an unsteady simulation or known as transient simulation. Computational simulations are based on the Reynold Average Navier-Stokes (RANS) equation solution. The simulated vehicle moves forward and backward according to the sinus function, with a frequency of 0.25 Hz, a 2 m amplitude, a cruising depth of 10 m below sea level, and Vcruise 1.54 m / s (Re = 9.000.000). Simulation result data includes velocity contour, variation of force and acceleration to frequency, and added mass coefficient.

Author keywords

Added mass,Computational simulation,Forward-and-backward,Hydrodynamic characteristics,Hydrodynamic interaction,Transient simulation,Underwater vehicle dynamics,Underwater vehicles

Indexed keywords

added mass coefficient,Transient simulation,Underwater vehicle,Unsteady hydrodynamic

Funding details

DOI