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The Proceedings Fifth International Conference on Numerical Ship Hydrodynamics (1990) / Chapter Skim
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A Hybrid Model for Calculating Wave-Making Resistance
Pages 657-666

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From page 657...
... A three-dimensional source-sink method is adopted in the numerical treatment of the problem, using a source function for an infinite fluid. A distribution of source density on the wetted part of the body, on a local part of the free surface and on the control surfaces has to satisfy the boundary conditions in the inner domain.
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From page 658...
... The inner domain is bounded by the body surface, SB, the free surface, SF, two vertical control surfaces, So, and a surface at infinity, S.,. The outer domain consists of the rest of the fluid domain, which is two segments of a sphere, marked by the dotted lines in the figure.
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From page 659...
... . Assuming that the free stream linearization is satisfactory in the outer domain, other linear or nonlinear boundary conditions on the free surface in the inner domain may be used.
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From page 660...
... Then a very limited part of the free surface was needed to be panelized. The effect of moving the control surfaces was checked by investigating the wave elevation along the innermost row of panels compared to the wave elevation obtained by using the Greens function definition, equation 25, in appendix A
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From page 661...
... New tests where carried out for the single point source using these conditions. The wave elevation changed, as expected, somewhat compared to the tests with only freestream linearization in the inner domain, but the effect of using the vertical control surfaces where similiar.
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From page 662...
... In [7i, the results of a great number of test cases are listed, varying the number of elements on the hull, free surface and control surfaces. Also the position and extent of the vertical control surfaces were changed.
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From page 663...
... The position of the vertical control surfaces and the upstream and downstream truncation boundaries are kept constant. The computer time for solving the equation sys~ O i The sin kage, nondimensionalized with respect to U2/29 Froud8 no.: 0.2SC and trim, nondimensionalized with respect to the length are plotted in figure 10 and 11.
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From page 664...
... David Taylor Naval Ship Research and Development Center, 16.-17. November 1983.
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From page 665...
... Fifteenth Symposium on Naval Hydrodyn amics. Boundary condition on the vertical control sur face Consider the vol u me bou nded by So , SFa nd S.=, i n figure 14.
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From page 666...
... Consequently the computational domain will have contributions only from the vertical control surfaces and the transverse control surface behind the ship. , \ 1 \ , s;, 1 So x Figure 15: Control surfaces for calculating wave resistance.
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Key Terms

  • free surface
  • vertical control
  • inner domain
  • wave resistance
  • boundary condition

  • outer domain
  • control surface
  • wave elevation
  • wave length
  • hull surface

  • disturbance potential
  • taylor naval
  • ship research
  • david taylor
  • radiation condition

  • kinematic boundary
  • naval ship
  • boundary conditions
  • surface integration
  • free stream

  • computational domain
  • minimum depth
  • vertical row
  • surface condition
  • longitudinal rows

  • ship wave
  • potential flow
  • numerical solution
  • longitudinal direction
  • stream linearization


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