Numerical Investigation of Step Depth Effects on Hydrodynamic Performance of Planing Hull Using Dynamic Mesh and Two Degree of Freedom Model

Document Type : Research Article

Authors

1 Sea-Based Energy Research Group-Babol Noshirvani University of Technology-Babol-Iran

2 Department of Mechanical Engineering, Babol Noshiravani University of Technology

Abstract

At low speeds, planing hull performs like a displacement one and buoyancy force has the most influence on it, but, when it reaches to enough speed, hydrodynamic lift force equilibrates 50–90 percent of its weight. Planing hull researchers have introduced different methods in order to achieve the highest speed. A desirable planing hull has low weight-to-power ratio and good maneuverability. Several ways have been applied to reduce drag and one of the best strategies is to use step that leads to less wetted surface and more lift power. This work addresses the numerical study of step height effect on hydrodynamic performance of planing hull. A specified form of a monohull was changed to the step one while important geometric parameters such as Deadrise angle, width and length were equal in both of them. In order to simulate hull movements, a comprehensive series of viscous computational fluid dynamics simulations considering free-surface and two degree of freedom motion of the hull (heave and pitch) have been performed by application of dynamic mesh. Results have been presented as contours and plots. According to the results, deeper steps provide greater levels of ventilation but, there is a limit in step depth increment because porpoising happens after a specific height.

Keywords

Main Subjects

References

[1]  P.  Lotfi,  M.  Ashrafizaadeh,  R.K.  Esfahan,  Numerical investigation of a stepped planing hull in calm water,  Ocean engineering, 94 (2015) 103-110.
[2]  O.M.  Faltinsen,  Hydrodynamics  of  high-speed  marine vehicles, Cambridge university press, 2005.
[3]  http://www.aeromarineresearch.com/steps.html.
[4] L.R. Baker, Boat, in, Google Patents, 1916.
[5]  W. Sottorf, Experiments with planing surfaces, (1934).
[6]  J.M. Shoemaker, Tank tests of flat and v-bottom planning surfaces, (1934).
[7]  L.  Sedov,  Scale  effect  and  optimum  relations  for  sea surface planning, (1947).
[8]  J.R. Dawson, Tank tests of two models of flying-boat hulls to determine the effect of ventilating the step, (1937).
[9]  D.  Savitsky,  Hydrodynamic  design  of  planing  hulls, Marine Technology, 1(1) (1964).
[10]  D. Savitsky, P.W. Brown, Procedures for hydrodynamic evaluation of planing hulls in smooth and rough water, Marine Technology, 13(4) (1976) 381-400.
[11]  E.P. Clement, J.D. Pope, Stepless and Stepped Planing Hulls-Graphs for Performance Prediction and Design, DAVID TAYLOR MODEL BASIN WASHINGTON DC, 1961.
[12]   M.V. Makasyeyev, Numerical modeling of cavity flow on bottom of a stepped planing hull, (2009).
[13]   D. Taunton,  D.  Hudson,  R.  Shenoi,  Characteristics  of a series of high speed hard chine planing hulls-part 1: performance in calm water, International Journal of Small Craft Technology, 152 (2010) 55-75.
[14]   K.I.  Matveev,  Two-dimensional  modeling  of  stepped planing hulls with open and pressurized air cavities, International Journal of Naval Architecture and Ocean Engineering, 4(2) (2012) 162-171.
[15]   J.-I.  Shin,  J.-M.  Yang,  H.-W.  Park,  J.-S.  Kim,  H.-C. Kim, A Study on the Resistance Characteristics of    a Stepped Planing Hull Using a High-Speed Towing System, Journal of the Society of Naval Architects of Korea, 42(4) (2005) 341-349.
[16]   D.   Svahn,   Performance   prediction   of   hulls   with transverse steps, A Report of Masters Thesis,  The Royal Institute of Technology, KTH, Centre for Naval Architecture, (2009).
[17]   D.   Savitsky,   M.   Morabito,   Surface   wave   contours associated with the forebody wake of stepped planing hulls, Marine Technology, 47(1) (2010) 1-16.
[18]   W.R. Garland, K.J. Maki, A numerical study of a two- dimensional stepped planing surface, Journal of Ship Production and Design, 28(2) (2012) 60-72.
[19]   K.I. Matveev, T.J. Burnett, A.E. Ockfen, Study of air- ventilated cavity under model hull on water surface, Ocean Engineering, 36(12) (2009) 930-940.
[20]   A.  Loni,  P.  Ghadimi,  H.  Nowruzi,  A.  Dashtimanesh, Developing a computer program for mathematical investigation of stepped planing hull characteristics, International Journal of Physical Research, 1(2) (2013) 34-47.
[21]   A. De Marco, S. Mancini, S. Miranda, R. Scognamiglio, L. Vitiello, Experimental and numerical hydrodynamic analysis of a stepped planing hull, Applied Ocean Research, 64 (2017) 135-154.
[22]   D.  Jones,  D.  Clarke,  FLUENT  Code  simulation  of flow around a naval hull: the DTMB 5415, DEFENSE SCIENCE AND TECHNOLOGY ORGANIZATION VICTORIA (AUSTRALIA) MARITIME, 2010.
[23]   M.S. Seif, E. Jahanbakhsh, R. Panahi, M.H. Karimi, A unified computational method for simulating dynamic behavior of planing vessels, China Ocean Engineering, 23(2) (2009) 1-10.
[24]   H.    Ghassemi,    M.    Kamarlouei,    S.T.G.   Veysi,   A hydrodynamic methodology and CFD analysis for performance prediction of stepped planing hulls, Polish Maritime Research, 22(2) (2015) 23-31.
[25]   M.   Bakhtiari,   S.   Veysi,   H.   Ghassemi,   Numerical modeling of the stepped planing hull in calm water, International Journal of Engineering-Transactions B: Applications, 29(2) (2016) 236.
[26]   A.  Mehrizi,  M.T.  Dakhrabadi,  A.V.  Sefat,  M.  Seif, Hydrodynamic Optimization of Hull Form of High Speed Planing Craft by Multi Objective Genetic Algorithm in Calm Water.
[27]   R. Yousefi,  R.  Shafaghat,  M.  Shakeri,  Hydrodynamic analysis techniques for high-speed planing hulls, Applied ocean research, 42 (2013) 105-113.
[28]    R.  Yousefi,   R.   Shafaghat,   M.   Shakeri,   High-speed planing hull drag reduction using tunnels, Ocean engineering, 84 (2014) 54-60.
[29]    H.K. Moghadam, R. Shafaghat, R. Yousefi, Numerical investigation of the tunnel aperture on drag reduction in a high-speed tunneled planing hull, Journal of the Brazilian Society of Mechanical Sciences and Engineering, 37(6)(2015) 1719-1730.
[30]    S.T.G.  Veysi,  M.  Bakhtiari,  H.  Ghassemi,  M.  Ghiasi, Toward numerical modeling of the stepped and non- stepped planing hull, Journal of the Brazilian Society   of Mechanical Sciences and Engineering, 37(6) (2015) 1635-1645.
[31]   W.R.   Garland,   Stepped   planing   hull   investigation, SNAME Trans., (2010) 1-11.
AUT Journal of Mechanical Engineering
Volume 3, Issue 2
December 2019
Pages 139-148

Files

Share

How to cite

Statistics