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Eighteenth Symposium on Naval Hydrodynamics (1991) / Chapter Skim
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Viscous Flow Past a Ship in a Cross Current
Pages 721-726

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 721...
... CALCULATION OF ASYMMETRIC FLOWS A detailed description of the basic numerical method and its applications to symmetric flows about double models, i.e., with the water and keel planes treated as planes of symmetry, is given in Patel, Chen and Ju (1988, 1990~. The modifications in the method and the associated computer programs to calculate the flow around a ship double model at an angle of yaw are relatively minor.
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From page 722...
... Because we are now considering a half plane of -90° < ~ < 90°, there are no explicit boundary conditions to be satisfied at the false wake plane. However, because of the rapid changes occurring in the velocity components in cylindrical coordinates near the singular point r = 0, increased accuracy and stability of the solution procedure was obtained by interpolating in these components in Cartesian coordinates, and then transforming back to the cylindrical coordinates.
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From page 723...
... The asymmetries in the stern flow, resulting from asymmetric stern shapes, cross currents, or maneuvers, are obviously of interest in the design of propulsors and appendages, and in the prediction of hull vibration. The present calculations represent a first step in the development of numerical methods capable of addressing these issues in a comprehensive and realistic manner.
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From page 724...
... Ship in a cross current; notation Figure 2. Hull shapes a = 10° (a)
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From page 725...
... Transverse velocity Figure 4. Velocity field on HSVA tanker at transverse section x/L = 0.9 0.7 1~ '1 -Experiment Calculation (~1 Axial velocity us (b)
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From page 726...
... Axial velocity (b) Transverse velocity TIC (c)
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Key Terms

  • cross current
  • axial vorticity
  • boundary layer
  • numerical method
  • velocity field

  • viscous flow
  • axial velocity
  • hsva tanker
  • secondary motion
  • transverse velocity

  • flow past
  • false wake
  • boundary conditions
  • exit plane
  • numerical methods

  • wake plane
  • uniform stream
  • solution domain
  • velocity components
  • double models

  • straight course
  • inviscid flow
  • friction velocity
  • rapid changes
  • cylindrical coordinates

  • transverse section
  • double model
  • yaw angle
  • vortex formation
  • asymmetric flow


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