Accession Number : ADA569188


Title :   Development of a Four-Fin Bio-Inspired UUV: CFD Studies


Descriptive Note : Memorandum rept.


Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC LAB FOR COMPUTATIONAL PHYSICS AND FLUID DYNAMICS


Personal Author(s) : Ramamurti, Ravi ; Geder, Jason D


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA569188


Report Date : 04 Sep 2012


Pagination or Media Count : 39


Abstract : The development of an unmanned underwater vehicle (UUV) with four actively controlled curvature flapping fins is described. Three dimensional unsteady flow computations past several configurations of the vehicle are computed and based on the minimum drag a nearly elliptical cross-section with a smooth leading and trailing sections was obtained. The hydrodynamic characteristics of this vehicle at NRL are computed for a range of operational conditions and a dynamic mode of this vehicle was created for the development of a controller. Detailed parametric studies were carried out varying several physical and kinematic parameters, such as separation of the two fins, the phasing of the rear fin with respect to the front fin, the vehicle speed, and the fin orientation. The unsteady flow solver is coupled to a 6-DOF model to simulate an unconstrained yaw and dive maneuvers of the vehicle.


Descriptors :   *FINS , *UNDERWATER VEHICLES , ANGLE OF ATTACK , COMPUTATIONAL FLUID DYNAMICS , DIVING , DRAG , HYDRODYNAMIC CHARACTERISTICS , INCOMPRESSIBLE FLOW , LEADING EDGES , LIFT , LOW VELOCITY , MANEUVERABILITY , ORIENTATION(DIRECTION) , SELF OPERATION , SIMULATION , THRUST , TRAILING EDGES , UNMANNED , UNSTEADY FLOW , YAW


Subject Categories : Marine Engineering
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE