The V style (skis together or crossing in back and spread in front) technique in flight phase is one of the most important and fundamental technique in the ski jumping. However, there are a few studies about flowfield around the athlete and ski surfaces. Then, the purpose of this study is to clarify the characteristic of flowfield about the V style technique in flight phase using Computational Fluid Dynamics. Two triangular surface meshes were produced on the 3D simplified human models and skis in the Case 1 (attacking angle of the skis = 0 deg.) and Case 2 (attacking angle of the skis = 20 deg.). Moreover, ten triangular surface meshes were produced on the 3D dummy models and skis from Case1 (attacking angle of the skis = 0 deg.) to Case 10 (attacking angle of the skis = 45 deg.).
　The calculations was made by the Renormalization-Group (RNG)-based k-εturbulent flow model. The calculations by Fluent/uns (Fluent Inc.) required 120 iterations to arrive at these solutions with run times on a EWS (O₂; SGI | Cray Inc.) at about six hours for each calculation. The high intensity dragging force on the athlete and ski surfaces were observed at the head, shoulder, and feet in both the 3D simple model and the 3D dummy model. The good agreement is observed between the experiment data by wind tunnel with the simulation data in 3D dummy model. The Lift-Drag ratio increases from 0 deg. to 20 deg. in attacking-angle sharply, and that decreases from 20 deg. to 45 deg. gradually. The maximum Lift-Drag ratio is 1.523 which attacking-angle is 20 deg.

DESCENTE SPORTS SCIENCE Vol.19/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE