|Principal Investigator(s)||Roel Verstappen|
For all but the lowest Reynolds number the flow around a cylinder separates and vortices are formed in the wake. The asymmetric shedding of vortices into the wake induces forces on the cylinder. These forces can cause the cylinder to vibrate. Such a vibration is termed a Vortex-Induced Vibration (VIV). Pipelines linking the seabed to the offshore platform for oil production, for example, exhibit VIV. Marine riser pipes are often exposed to high Reynolds number currents, Re>100,000 where the Reynolds number is based on the free stream flow speed, the diameter of the pipe and the viscosity of water. The fluid excitation of marine riser pipes forms a potent source of fatigue. Studying the potentially destructive consequences of VIV requires a coupled fluid and structural dynamics model. Since the numerical simulation of turbulent flow around a rigid cylinder at Re>100,000 forms a grand challenge to current Computational Fluid Dynamics (CFD) models we will concentrate on solving the flow problem in this project. To that end, simulations based on a symmetry-preserving regularization model of turbulent flow will be performed in the range Re=20,000-200,000. At Re=20,000, the results will be compared to that of Direct Numerical Simulation (DNS).