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Improved Time-Domain Simulation of Planing Hulls in Waves by Correction of the Near-Transom Lift
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-9110-9401
2005 (English)In: International Shipbuilding Progress, ISSN 0020-868X, Vol. 52, no 3, 201-230 p.Article in journal (Refereed) Published
Abstract [en]

Time-domain simulation, based on 2-dimensional high-frequency added mass formulation of the sectional forces, is a computationally attractive approach to the non-linear behaviour of the planing craft in waves. Nevertheless, the 2-dimensional strip approach, demands for corrections of the lift distribution in order to correctly model the running attitude which is significant for the loads and motions for planing craft in waves. This has traditionally been made by a reduction of the hydrostatic lift and moment with reference to the geometrical fact that the transom stern is dry. This action improves the simulation of the running attitude in calm water but not necessarily of the dynamic behaviour in waves. The paper proposes a correction operating on both the hydrostatic and the hydrodynamic terms of the load distribution. A reduction function is chosen on the basis of model test measurements of the near-transom pressure, and on published model data on running attitude. The approach is satisfactory validated in calm water, regular and irregular waves. Simulations of model experiments and comparison with measurement time series are presented. The correction improves the simulation in both calm water and in waves for a wider speed range compared to a correction limited to the hydrostatic terms.

Place, publisher, year, edition, pages
2005. Vol. 52, no 3, 201-230 p.
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-4966ScopusID: 2-s2.0-24944492239OAI: diva2:7255
Available from: 2004-10-08 Created: 2004-10-08 Last updated: 2011-09-02Bibliographically approved
In thesis
1. Modeling of planing craft in waves
Open this publication in new window or tab >>Modeling of planing craft in waves
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Simulation of the planing hull in waves has been addressed during the last 25 years and basically been approached by strip methods. This work follows that tradition and describes a time-domain strip model for simulation of the planing hull in waves. The actual fluid mechanical problem is simplified through the strip approach. The load distribution acting on the hull is approximated by determining the section load at a number of hull sections, strips. The section-wise 2-dimensional calculations are expressed in terms of added mass coefficients and used in the formulations of both inertia and excitation forces in the equations of motions. The modeling approach starts from the hypothetic assumption that the transient conditions can be modeled based on those section-wise calculations. The equation of motion is solved in the time-domain. The equation is up-dated at each time step and every iteration step with respect to the momentary distribution of section draught and relative incident velocity between the hull and water and catches the characteristic non-linear behavior of the planing craft in waves.

The model follows the principles of the pioneering work of E. E. Zarnick differing on model structure and in details such as the modeling of the lift in the transom area. A major part of the work is concerned with experiments and evaluation of simulations with respect to performed model tests and to published experiment data. Simulations of model tests have been performed and comparisons have been made between measured and simulated time series. The link between simulation and experiment is a wave model which is based on a wave height measurement signal. It is developed and evaluated in the thesis.

The conclusions are in favor of the 2-dimensional approach to modeling the conditions for the planing hull in waves and among further studies is evaluation of simulated loads and motions to full-scale trial measurement data.

Place, publisher, year, edition, pages
Stockholm: Farkost och flyg, 2004
Trita-AVE, ISSN 1651-7660 ; 2004:34
Hydraulic engineering, marine, ocean, Planing craft, time-domain simulation, design loads, Vattenteknik
National Category
Water Engineering
urn:nbn:se:kth:diva-14 (URN)91-7283-861-2 (ISBN)
Public defence
2004-10-14, Kollegiesalen, KTH, Valhallavägen 79, Stockholm, 10:00
Available from: 2004-10-08 Created: 2004-10-08 Last updated: 2012-03-20

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