TY - JOUR
T1 - Numerical investigation on added mass and damping force coefficient of an underwater vehicle in cavitating flows
AU - Wang, Z. Y.
AU - Wang, G. Y.
AU - Hu, C. L.
AU - Cui, Z. Y.
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2015
Y1 - 2015
N2 - The objective of this paper is mainly to study the influence of cavitation on the added mass and damping force coefficient. Based on Reynolds averaged Navier-Stokes equations, the dynamic mesh is used to calculate the added mass, and the rotating coordinate frame method is applied to research on the damping force coefficient. In order to obtain fluid damping force coefficients, the movement pattern is set as a uniform circular motion. Then the additional force coefficient and pitch damping moment coefficient could be obtained using the method of least squares. The result shows that the method to calculate added mass is reliable by comparing with the analytical solution. With the cavitation number decreasing, the absolute value of the added mass of λ22 decreases and λ26 increases. What's more, both the absolute value of damping force and moment coefficient decrease substantially with the development of cavity when the cavitation number is larger than 0.45. However, with the cavitation number less than 0.45, the un-symmetric cavity is more prominent, the absolute value of damping force and moment coefficient increase slightly. This is probably caused by the strengthened pressure peak at the suction side induced by the re-entrant flow.
AB - The objective of this paper is mainly to study the influence of cavitation on the added mass and damping force coefficient. Based on Reynolds averaged Navier-Stokes equations, the dynamic mesh is used to calculate the added mass, and the rotating coordinate frame method is applied to research on the damping force coefficient. In order to obtain fluid damping force coefficients, the movement pattern is set as a uniform circular motion. Then the additional force coefficient and pitch damping moment coefficient could be obtained using the method of least squares. The result shows that the method to calculate added mass is reliable by comparing with the analytical solution. With the cavitation number decreasing, the absolute value of the added mass of λ22 decreases and λ26 increases. What's more, both the absolute value of damping force and moment coefficient decrease substantially with the development of cavity when the cavitation number is larger than 0.45. However, with the cavitation number less than 0.45, the un-symmetric cavity is more prominent, the absolute value of damping force and moment coefficient increase slightly. This is probably caused by the strengthened pressure peak at the suction side induced by the re-entrant flow.
UR - http://www.scopus.com/inward/record.url?scp=84924370944&partnerID=8YFLogxK
U2 - 10.1088/1757-899X/72/6/062057
DO - 10.1088/1757-899X/72/6/062057
M3 - Conference article
AN - SCOPUS:84924370944
SN - 1757-8981
VL - 72
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
IS - Forum 6
M1 - 062057
T2 - International Symposium of Cavitation and Multiphase Flow, ISCM 2014
Y2 - 18 October 2014 through 21 October 2014
ER -