USA As Represented by Secretary of the Navy

Christopher J Kerr

Charles M Dai

Han-Ch'ing Wang

Phuc N Nguyen

The invention is directed to a method for designing a fluid inlet duct for marine vehicle hull, generally comprises the steps of: (a) determining an inlet duct surface geometry, represented by a series of fifth-order Bezier cross-link curves, within specified hydrodynamic design constraints; (b)generating a panel representation of the surface geometry; (c) calculating the pressure and velocity distributions of the flow within the inlet duct; (d) evaluating the surface geometry; (e) repeating steps (a)-(d) for subsequent iterations of the surface geometry until the specified hydrodynamic design constraints are satisfactorily met at a predetermined design condition; (f) evaluating a resulting surface geometry at off-design conditions; (g) repeating step (a)-(d) for subsequent iterations of the surface geometry until the specified hydrodynamic design constraints are satisfactorily met at off-design conditions; (h) performing a geometric refinement to a fillet region of high curvature in the inlet duct; (i) generating a panel representation of a resulting surface geometry; (j) calculating the pressure and velocity distributions of the flow within the inlet duct; (k) evaluating the surface geometry at desired operating conditions; and (l) repeating steps (h)-(k) for subsequent iterations of the surface geometry until the specified hydrodynamic design constraints are optimally met.

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Germantown, MD, United States of America

Christopher J Kerr