Measurements of the three-dimensional flow velocity components (u, v, w) are carried out around a 2 m Inuid Model M 21 where a specially developed mini five-hole pitot tube of 6 mm diameter is applied satisfactorily.
The velocity components are analyzed (u, v, w-analysis) in a synthetic co-ordination with the corresponding wave analysis (C-analysis) which was previously reported on the same model (M21).
The study indicates that, i. e.
For potential field ;
(1) The two linearized free surface conditions, i. e. the “atmospheric” condition as well as the “kinematical” condition, are both valid either between ζ (measured) and u (measured) or between ∂ζ/∂χ (measured) and w (measured).
(2) The behaviour of the transverse componentv (y) is the most important, because this, component alone can give the unique informations for sheltering effects which are not included in the wave-analysis.
(3) The results analyzed from u or w are almost similar to those already obtained by wave analysis.
For viscous field ;
(4) The flow field analysis is useful also for the refinement of the wake-survey by enabling the quantitative estimation of the disturbance velocity (u1) which is fictitiously presumed within the wake belt.