derivation of source term relationships for appendages of submarines in numerical modeling by using captive model test

Auvs are the most suitable tool for conduction survey concerning with global environmental problems. auvs maneuverability should be carefully checked so as to improve energy efficiency of the vehicle and avoid unexpected motion. also, computational fluid dynamics (cfd) has progressed rapidly in the past fifty years. it has been used in many industrial fields such as air and space and marine engineering. with the use of cfd, the simulation of fluid behavior would be possible while allocating less cost and time. cfd is used on the basis of reynolds averaged navier–stokes (rans) equations for the calculation of hydrodynamic coefficients which are needed in the maneuverability study of underwater vehicles (uwv). the simulation of the resistance tests up to 20 degrees of yaw angle was conducted for an autonomous underwater vehicles. simulations are performed for bare hull and hull equipped with three different hydroplanes. following the extracting numerical results a mathematical model is developed to calculate hydrodynamic force for different sail type in order to predict autonomous underwater vehicle (auv) maneuverability. the results show good agreement between theory and experiment. these predictions indicated that there was a non-linear relationship between forces and moments, and the lateral speed. moreover, non-linear hydrodynamic coefficients were calculated in addition to linear ones.

derivation of source term relationships for appendages of submarines in numerical modeling by using captive model test

auvs are the most suitable tool for conduction survey concerning with global environmental problems. auvs maneuverability should be carefully checked so as to improve energy efficiency of the vehicle and avoid unexpected motion. also, computational fluid dynamics (cfd) has progressed rapidly in the past fifty years. it has been used in many industrial fields such as air and space and marine engineering. with the use of cfd, the simulation of fluid behavior would be possible while allocating less cost and time. cfd is used on the basis of reynolds averaged navier–stokes (rans) equations for the calculation of hydrodynamic coefficients which are needed in the maneuverability study of underwater vehicles (uwv). the simulation of the resistance tests up to 20 degrees of yaw angle was conducted for an autonomous underwater vehicles. simulations are performed for bare hull and hull equipped with three different hydroplanes. following the extracting numerical results a mathematical model is developed to calculate hydrodynamic force for different sail type in order to predict autonomous underwater vehicle (auv) maneuverability. the results show good agreement between theory and experiment. these predictions indicated that there was a non-linear relationship between forces and moments, and the lateral speed. moreover, non-linear hydrodynamic coefficients were calculated in addition to linear ones.