Development of High-accurate Numerical Simulation Platform for Capture of Blade-tip Vortex Over Rotors
In order to accurately capture the wake vortex of rotors,overset grid system consists of a cartesian background grid and several body-fitted blade grids,dynamic overset grid technique with multi-start distance decreasing method and a tri-linear interpolation method,arbitrary partition of grid system for parallel computation,and unsteady RANS(Reynolds Averaged Navier Stokes)method are studied.An efficient parallel software platform for high-accurate numerical simulation of unsteady vortex flow over rotors is established,which consists of four programs for achieving generation of structured overset grid system,identification of cell-types and search of donor cells,arbitrary partition for grid system and overset information matching and high-accurate parallel numerical simulation of complex flow over rotors.Using the developed method and software platform,high-accurate numerical simulation of vortex wake structure over conventional single rotor and coaxial rotor was carried out,and sophisticated tip vortex structure and its unsteady generation,development and evolution process were captured.
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