Numerical investigation of sensitivity of AUV dynamic coefficients and added mass to variations in amplitude and frequency of excitation

Authors

1 shahid rajaee teacher training university tehran

2 Mech. Eng., shahid rajaee Univ., Tehran, Iran

3 shahid rajaee teacher training Tehran

Abstract

The hydrodynamic coefficients and derivatives of a AUV are very important parameters that affect its control and maneuverability. Usually, a straight-line towing test method and forced heave and pitch motion are used to derive coefficients. In this paper, we used the CFD method with the control volume approach and commercial Fluent software, the flow is simulated around a subsurface. First, simulation was performed for straight-line towing test to by comparing the results with experimental results, to selected the grid type and suitable turbulent model. To simulate forced heave and pitch motion, a udf program is written that oscillates the model with specific amplitudes and frequencies. Software output is the time-coefficients varying that is converted to dynamic coefficients by a Matlab program. The results show that the Z_W ̇^' coefficient is approximately constant with variation of amplitude and oscillation frequency of the model but the Z_W^', M_W^' and M_W ̇^' coefficients change with frequency and amplitude to 35%. The results show all coefficients of pitch motion increased with increasing amplitude and frequency of model oscillation that the lowest increase is related to the M_q ̇^' coefficient with less than 8% variation in its absolute value. The remaining coefficients showed up to 80%.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 10, Issue 4
December 2021
Pages 195-208

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