On the Visualization of Three-Dimensional Vortical Structures in the Wake behind a Road Vehicle by PIV Measurements

PIV 측정을 통한 자동차 후류 3차원 와구조의 정량적 해석

  • 이석종 (서울산업대학교 에너지환경대학원) ;
  • 성재용 (서울산업대학교 기계공학과) ;
  • 김진석 (순천대학교 대학원 기계공학과) ;
  • 김성초 (순천대학교 기계자동차공학부) ;
  • 김정수 (순천대학교 기계자동차공학부) ;
  • 최종욱 (순천대학교 기계자동차공학부)
  • Published : 2005.12.01


Three-dimensional vortical structures in the wake behind a road vehicle has been visualized with the help of two-dimensional PIV measurement data. A three-dimensional velocity field has been reconstructed from several sectional measurement data in the x-y, y-z and z-x planes. Isovorticity surface observed by stacking only the sectional data in each plane, does not show the vortical structures within the recirculation region but represents only the strong shear flows. Thus, in the present study, the velocity component normal to the x-y plane is obtained by interpolating those velocities in the z-x plane. Then, a $\lambda_{2}$-definition which captures the local pressure minimum or vortex core, is applied to visualize the vortices in the recirculation region. The final results represent a successful configuration for the three-dimensional vortices.