Numerical Investigation on Drag and Vortex Induced Vibration Characteristics of Multiple Cylinders

Abstract The drag and vortex induced vibration (VIV) characteristics of a multiple cylinder are investigated using the detached eddy simulations. cylinders consist single main twin auxiliary for deep sea mining riser. Tandem side-by-side arrangements tested compared with cylinder. stationary case in range 0.5∼2.0 × 10 5 Reynolds number (Re). tandem arrangement shows smaller than those while it’s consisted three cylinders. vortexes observed at clearance between which make become airfoil-like section as total induce smallest other cases. VIV studied cases forced oscillation cross-flow direction. damping added mass coefficients direction estimated from time series lift forces. Flow field analysis reveal difference due to variety pipe.