Identification of Drag Force of the Underwater Vehicles
Author(s):
Abstract:
An inverse analysis is conducted for the estimation of drag coefficient and wakes width in incompressible turbulent flows over the moving underwater bodies. The inverse analysis uses the laws of momentum and mass conservation for a control volume to estimate the drag coefficient and the wakes width from the measured velocity in the wake. The drag coefficient and wakes width are determined as unknown parameters by the LevenbergMarquardt algorithm. The proposed inverse method is applicable for an environment without boundaries (e.g., the sea). Several experiments are conducted to evaluate the developed inverse algorithm. The wake velocity behind a cylinder located in the flow field is measured by a calibrated pitot tube and is used as an input to the algorithm. The cylinder is selected as the test body, because its hydrodynamic information is available in the literature. The effects of the tunnels wall and the turbulence intensity are considered in the results of the algorithm. The estimated drag coefficient is validated by the values presented in the literature. The estimated wake-velocity profiles are fitted favorably with the measured velocities at the corresponding locations. It is shown that the proposed inverse method can be used to estimate the drag coefficient and wakes width of the underwater vehicles with very good accuracy.
Keywords:
Language:
English
Published:
Journal Of Applied Fluid Mechanics, Volume:10 Issue: 1, Jan-Feb 2017
Page:
275
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