Aerodynamic Drag of Cylindrical Vehicles Moving Concentrically Within Long Tubes

摘要

A numerical analysis is made of developing and developed turbulent flow in the annular region between a cylinder moving at constant velocity within a fixed concentric tube. Turbulent shear is modeled by eddy viscosity, and a uniform velocity is assumed at the entrance to the annular region. The computations extend and modify the method of Sud and Chaddock (1981) to arbitrary Reynolds numbers and radius ratios. While this report is based on the author's masters thesis the fully developed flow results are more complete, and those for developing flow are more accurate. Better accuracy was achieved by implementing double precision, which enabled the computations to be performed further into the developing region. Keywords: Drag forces, Cylindrical vehicles, Flow modeling. (edc)