Base drag reduction caused by riblets on a gaw(2) airfoil... • - base pressure coefficient, (pb- pjlgx airfoil chord riblet height • = local static pressure • = freestream static pressure • = freestream dynamic pressure = trailing-edge thickness friction velocity = distance along the chord = distance normal to tunnel axis = angle of attack • (CD61,1r ~ CD gin ri8]el) kinematic viscosit
A flexible architecture for extracting metro tunnel cross sections from terrestrial laser scanning point clouds... In tunnel central extraction, we propose a slice-based method to obtain an initial central axis, which is further divided into linear and nonlinear circular segments by an enhanced Random Sample Consensus (RANSAC) tunnel axis segmentation algorithm....
Point cloud modelling based on the tunnel axis and block estimation for monitoring the badaling tunnel, china... In the application of monitoring the Badaling Tunnel for the Winter Olympics 2020 in Beijing, China, the proposed method includes the following components: the tunnel axis is automatically estimated based on a 3D quadratic form estimation; all of the point clouds are segmented into axis-based blocks; and representative points, solved...
Tunvis: visualizing specific geologic features for tunnel planning and construction... paper describes a method and a system for visualizing a virtual tunnel through an existing geologic formation and a method for the generation of a camera animation along the tunnel axis....
