Frontiers in Energy
>> 2009,
Volume 3,
Issue 3
doi:
10.1007/s11708-009-0010-4
Research articles
Investigation of vortical flows over oscillating
body using fast Lagrangian vortex method
Department of Thermal
Engineering, State Key Laboratory of Hydroscience and Engineering,
Tsinghua University, Beijing 100084, China;
Available online: 2009-09-05
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Abstract
A computational method facilitating long-time and high-resolution unsteady vortical flows is developed with the advantages of the discrete vortex methods. Both the velocity and pressure distribution of the flow field are calculated by integral formulations in combination with a fast summation algorithm. The vorticity field is described by Lagrangian representation, which is well suited to the moving boundary. Viscosity diffusion of the vorticity is considered with the core spreading model corrected by an adaptive splitting and merging algorithm. The effectiveness of the present method is examined by comparing the numerical results of unsteady separated flows which pass a cylinder and a thin cambered blade undergoing rotational oscillations with available experimental results. Interesting results about vortex shedding patterns and lock-in characteristics are provided for the thin cambered blade.
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