Characteristics of Flow around an Impulsively Rotating Square Cylinder via LB-DF/FD Method
NIE De-Ming1,2, LIN Jian-Zhong1,2
1State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027 2College of Metrology and Technology Engineering, China Jiliang University, Hangzhou 310018
Characteristics of Flow around an Impulsively Rotating Square Cylinder via LB-DF/FD Method
NIE De-Ming1,2, LIN Jian-Zhong1,2
1State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027 2College of Metrology and Technology Engineering, China Jiliang University, Hangzhou 310018
摘要Flow around an impulsively rotating square cylinder in a viscous fluid in range of 1≤Re≤300 is numerically investigated by the previously developed LB−DF/FD method, which combines the lattilce Boltzmann method (LBM) and direct-forcing fictitious domain (DF/FD) scheme. Results show that in total three kinds of transient characteristics depending on Re are observed: 1≤Re< 20, four vortices arising from the corners of the square cylinder separate from the surfaces and gradually become stable without vortex integration or shedding; 20≤Re< 100, vortices integration is observed when they grow long enough, then separated from each other; Re≥100, vortex shedding takes place in this regime. The shedding vortex joins the downstream vortex to form a new one. It is also found that vortex shedding happens more than one time when Re≥160. Furthermore, each vortex shedding induces a fluctuation in the torque exerted on the cylinder.
Abstract：Flow around an impulsively rotating square cylinder in a viscous fluid in range of 1≤Re≤300 is numerically investigated by the previously developed LB−DF/FD method, which combines the lattilce Boltzmann method (LBM) and direct-forcing fictitious domain (DF/FD) scheme. Results show that in total three kinds of transient characteristics depending on Re are observed: 1≤Re< 20, four vortices arising from the corners of the square cylinder separate from the surfaces and gradually become stable without vortex integration or shedding; 20≤Re< 100, vortices integration is observed when they grow long enough, then separated from each other; Re≥100, vortex shedding takes place in this regime. The shedding vortex joins the downstream vortex to form a new one. It is also found that vortex shedding happens more than one time when Re≥160. Furthermore, each vortex shedding induces a fluctuation in the torque exerted on the cylinder.
NIE De-Ming;LIN Jian-Zhong;. Characteristics of Flow around an Impulsively Rotating Square Cylinder via LB-DF/FD Method[J]. 中国物理快报, 2010, 27(10): 104701-104701.
NIE De-Ming, LIN Jian-Zhong,
. Characteristics of Flow around an Impulsively Rotating Square Cylinder via LB-DF/FD Method. Chin. Phys. Lett., 2010, 27(10): 104701-104701.
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