A method is proposed which can be used to optimize the spacing of multiple-cylinder supports for offshore structures that are subjected to time dependent hydrodynamic forces. Recently an exact analytical equation was obtained in closed form which predicts fluid forces on any number of cylinders in arbitrary motions. Using the general equation, a numerical experimentation was conducted on a 4 x 4 cylinder array subjected to oscillating flow wherein wake effects are negligible. The results indicate that if the cylinders are equally spaced in both directions, the total hydrodynamic load on the entire rig is constant and independent of the angle of attack. Forces on individual cylinders are also usually smaller than for other types of arrays. Thus equally spaced arrays are recommended for offshore drilling rigs.

Media Info

  • Features: References;
  • Pagination: p. 759-768

Subject/Index Terms

Filing Info

  • Accession Number: 00138194
  • Record Type: Publication
  • Source Agency: Offshore Technology Conference
  • Report/Paper Numbers: V1, OTC 2499 Proceeding
  • Files: TRIS
  • Created Date: Aug 23 1976 12:00AM