Force and power estimation in fish-like locomotion using a vortex-lattice method

The forces and power needed for propelling at constant speed an actively sw imming flexible fish-like body are calculated. A vortex-lattice method base d on a linearized theory is employed and the results are compared against s lender body theory predictions, as well as experimental data from an eight- link robotic instrument, the RoboTuna. Qualitative agreement is found betwe en our method and slender bod theory; with quantitative agreement over cert ain parametric ranges and disagreement for other ranges of practical intere st. The present linearized vortex lattice calculations predict the power ne eded for propelling the RoboTuna with less than 20 percent error in most ex periments conducted. [S0098-2202(00)01202-5].