TY - JOUR
ID - 426
TI - Identification of Drag Force of the Underwater Vehicles
JO - Journal of Applied Fluid Mechanics
JA - JAFM
LA - en
SN - 1735-3572
AU - Jahangardy, Y.
AU - Madoliat, R.
AU - Nouri, N. M.
AD - Iran University of Science and Technology, Tehran, Iran
Y1 - 2017
PY - 2017
VL - 10
IS - 1
SP - 275
EP - 281
KW - Inverse method
KW - Drag force identification
KW - Wake velocity profile
DO - 10.18869/acadpub.jafm.73.238.26162
N2 - 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.
UR - https://www.jafmonline.net/article_426.html
L1 - https://www.jafmonline.net/article_426_60b78f8955145427316be02b2ec0d5bc.pdf
ER -