Critical Analysis of a Flow Induced Vibration in Cross Flow around Triangular Array of Circular Cylinder

Abstract

Critical Analysis of a Flow Induced Vibration in Cross Flow around Triangu- lar Array of Circular Cylinders with two-degree of freedom, where the cylinder was allowed to vibrate in the transverse (cross- ow) and longitudinal directions. Compu- tational domain, Grid, Time step was optimized by performing Domain independent study, Grid independent study, Time step independent study. The computations were carried out at low Reynold number range of 50, 100, 150, 200 and 400 with sin- gle cylinder as well as multi-cylinder with change in downstream cylinder positions at 20o, 30o, 45o and 60o and varying pitch at 1:5 and 2, Using FLUENT (version 6.1.22). Effect of Reynold number on lift and drag force at various multi-cylinder arrangements were studied. The effects of Reynolds number on ow parameters such as drag coe cient, lift coe cient, pressure coe cient, strouhal number, lift and drag forces and vorticity were established. The lift and drag force on cylinder was used to solve the vibration equation, hence displacement of the cylinder which was validated with analytical as well as experimental results. A program was developed to calcu- late cylinder displacement and it has been employed successfully for the calculation and prediction of induced vibration of a circular cylinder.