Identification of Drag Force of the Underwater Vehicles

An inverse analysis is conducted for the estimation of drag coefficient and wake's 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 wake&#...

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Bibliographic Details
Published in:Journal of Applied Fluid Mechanics 2017-01, Vol.10 (1), p.275-281
Main Authors: Jahangardy, Yaser, Madoliat, Reza, Nouri, Nowrouz Mohammad
Format: Article
Language:English
Subjects:
Algorithms
Cylinders
Drag
Drag coefficients
Fluid dynamics
Fluid flow
Incompressible flow
Inverse
Inverse method
Inverse method
Drag force identification
Wake velocity profile
Pitot tubes
Turbulence intensity
Turbulent flow
Underwater vehicles
Velocity
Velocity distribution
Wakes
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Summary:An inverse analysis is conducted for the estimation of drag coefficient and wake's 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 wake's width from the measured velocity in the wake. The drag coefficient and wake's width are determined as unknown parameters by the Levenberg-Marquardt 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 tunnel's 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 wake's width of the underwater vehicles with very good accuracy.
ISSN:1735-3572
1735-3645
DOI:10.18869/acadpub.jafm.73.238.26162