... with the HDM and a Preston tube and 2) Drag measurements with the HDM on panels with 60- grit and 220-grit sandpaper. Smooth panel wall shear stress values obtained using the HDM were within experimental uncertainties of results from Preston tube. Roughness function values for 60-grit and 220-grit sandpaper...

... rough surfaces are many-fold: the surfaces can be manipulated to meet channel flow and large eddy simulation (LES) viscous size constraints; 3-D printing can then be used to build scaled rough surfaces that can be used in the fully developed turbulent channel flow; complex statistical and geometric...

... A portion of the upper deck surface of a submarine can be coated with roughness for crew safety when walking on the hull. The roughness factor for the non-skid coating on a full scale submarine is very large, on the order of 400 under typical ship operation conditions. Boundary layer...

... The idea of an adjustment to model test procedures in order to improve ship powering predictions was initially introduced many years ago as a roughness allowance because it was recognized that the basic methodology involved in predicting power from model tests yields powering estimates for ships...

... icbbrbaking ship hull coating hull-ice friction coefficient coefficient operator wagb-20 spencer marine transportation friction coefficient roughness instrument resistance THB BPPBCT OP HOLL·ICB FRICTION COBPPICIBNT ON THB RBSISTANCB OP ICBBRBAKING SHIPS by Donald Spencer Institute for Marine...

.... The effect of Reynolds number and applied tip roughness on the downstream tip vortex was investigated. In addition, the importance of the unsteady pressure fluctuations in the core on cavitation inception is discussed. vortex tunnel span strength tuft hydrofoil downstream roughness...