S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Mechanical Aerospace Engineering (기계항공공학부) Journal Papers (저널논문_기계항공공학부)
Numerical Investigation on the Ground Speed Effect around a Square Cylinder near the Ground
- Ku, Yo-Cheon; Kim, Kyu-Hong; Kim, Tae-Yoon; Lee, Dong-Ho
- Issue Date
- Taylor & Francis
- Numerical Heat Transfer, Part A, 53: 53-70, 2008
- The unsteady flow field around a square cylinder is investigated by solving the two-dimensional Reynolds-averaged Navier-Stokes equations with ε-SST turbulence model at Re = 20,000 with changes of gap height, from G/D = 0.1 to G/D = 2.0, and ground speed, from 0 to U∞, respectively. Through analysis on the vortex strength, lift and drag coefficients, and the Strouhal number of a square cylinder, it is found out that the separation bubble located on the ground behind a square cylinder is the core reason which makes significant differences of flow characteristics between the stationary and moving ground. Also the separation bubble seems to prevent the sharp transition from steady flow to periodic vortex shedding.
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