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| Numerical simulation on suppression of vortex shedding around the circular cylinder with O-rings |
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| DOI：10.7511/jslx20084111 |
| KeyWord:circular cylinder,large eddy simulation,O-rings,suppression of vortex shedding |
| HUANG Zhao-yu JIANG Wei-kang |
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| Abstract: |
| Vortex shedding from cylindrical structures is a widely studied problem since this phenomenon induces vibrations and sound.The large-eddy simulation(LES) technique is applied to the prediction of this flow phenomenon of Re=64000.Simulations are performed for a 2D and 3D smooth circular cylinder,which validates 3D simulation compared with experimental results.The smooth cylinder of diameter D is fitted with O-rings of diameter 0.0167D with 1D pitch.The analysis for the vorticity fields,velocity and lift coefficient spectra shows that the vortex shedding around the circular cylinder is suppressed by attaching O-rings to the surface of cylinder.The amplitude of lift fluctuation and velocity oscillation is greatly suppressed.Also the drag force acting on the cylinder is slightly reduced.This measure suppressing vortex shedding is applicable in engineering problems. |