US 11,853,655 B1
Method of predicting a ship resistance by designing and implementing a momentum thickness similarity simulator
Young T. Shen, Potomac, MD (US); Michael J. Hughes, Vienna, VA (US); and David E. Hess, Mt. Airy, MD (US)
Assigned to The United States of America, as represented by the Secretary of the Navy, Washington, DC (US)
Filed by United States of America As Represented by the Secretary of the Navy, Arlington, VA (US)
Filed on Sep. 24, 2019, as Appl. No. 16/580,943.
Claims priority of provisional application 62/735,744, filed on Sep. 24, 2018.
Int. Cl. G06F 30/15 (2020.01); B63B 3/14 (2006.01); G06F 17/13 (2006.01); G06F 30/20 (2020.01)
CPC G06F 30/15 (2020.01) [B63B 3/14 (2013.01); G06F 17/13 (2013.01); G06F 30/20 (2020.01)] 4 Claims
OG exemplary drawing
 
1. A hydrodynamic testing method comprising:
causing a model-scale vessel to move through water, wherein:
said model-scale vessel is characterized by a model-scale momentum thickness when said model-scale vessel moves through water at a selected model-scale vessel speed;
said model-scale momentum thickness relates to a model-scale boundary layer of said model-scale vessel;
said model-scale momentum thickness corresponds to a full-scale momentum thickness;
said full-scale momentum thickness relates to a full-scale boundary layer of a full-scale vessel, wherein:
said full-scale vessel is characterized by said full-scale momentum thickness when said full-scale vessel moves through water at a selected full-scale vessel speed;
said model-scale vessel is characterized by a selected geometry and includes a smooth axisymmetric body and a momentum thickness simulator;
in furtherance of said selected geometry, said momentum thickness simulator is characterized by a selected shape and a selected height;
said providing of said model-scale vessel includes coupling said momentum thickness simulator with said smooth axisymmetric body at a location at a selected distance from said model-scale leading edge;
said model-scale vessel is characterized by a turbulent said model-scale boundary layer between said momentum thickness simulator and said model-scale trailing edge;
measuring a model-scale resistance of said model-scale vessel, wherein said model-scale resistance is associated with said movement of said model-scale vessel through water at said model-scale vessel speed during which time said model-scale vessel is characterized by said model-scale momentum thickness;
determining a full-scale resistance of said full-scale vessel, said determining of said full-scale resistance including using a computer, wherein:
said full-scale resistance is associated with said movement of said full-scale vessel through water at said full-scale vessel speed during which time said full-scale vessel is characterized by said full-scale momentum thickness;
said determining of said full-scale resistance includes performing scaling of said model-scale resistance with respect to said full-scale resistance;
said performance of said scaling includes taking into consideration said movement of said model-scale vessel through water at said model-scale vessel speed during which time said model-scale vessel is characterized by said model-scale momentum thickness;
said performance of said scaling further includes taking into consideration said movement of said full-scale vessel through water at said full-scale vessel speed during which time said full-scale vessel is characterized by said full-scale momentum thickness;
said full-scale resistance is determined directly from said model-scale resistance in the absence of consideration of said full-scale resistance as consisting of frictional said full-scale resistance and residual said full-scale resistance.