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A study of jack-up leg drag coefficients
Authors:N. Pharr Smith and Carl A. Wendenburg
Affiliation:

Marathon LeTourneau Marine Company, 600 Jefferson, Suite 1900, Houston, Texas 77002, USA

Abstract:
The accurate prediction of drag coefficients for truss-type jack-up legs is an important part of a unit's design. Over the past 14 years, a series of windtunnel tests have been conducted on both square and triangular cross-section leg configurations. A calculation method which closely fits the model test data has also been adopted. A previous paper described the early testing and the MMEC calculation method for square legs. Since then, testing and research have continued on both square and triangular leg designs. This paper describes the more recent testing performed on square legs, and it details the testing and the MMEC method for triangular legs. In addition, the effects of cornerpost design and surface roughness are discussed. Several example calculations are provided in Appendices.
Keywords:jack-up   truss   leg   drag   coefficient   roughness
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