A computational study is presented which examines the flow over a sphere attached to a wall. The mesh is constructed with particular fine cells allocated in the vicinity of the sphere, and an unstructured-mesh code is employed to perform the numerical procedure. The results include velocity vectors at different cross-sections, sphere surface pressure contours, surface streamlines, surface Nusselt number contours, and variations of lift and drag coefficients and averaged Nusselt number against Reynolds number. It is found that the level of lift coefficient is about one-third the level of drag at most flow conditions. Over the range of Reynolds number investigated, drag coefficient and averaged Nusselt number behavior similarly to those in the flow over a free sphere, but the level of these two quantities are lower in the present case. Regarding the drag coefficient, the difference between the present flow and free-sphere flow is large at lower Reynolds number but becomes much smaller at higher Reynolds number. In terms of the averaged Nusselt number, the difference between the two flows remains at a moderate level of 14% to 16% over the range of Reynolds number examined.
|Number of pages||8|
|Journal||Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao|
|Publication status||Published - 2006 Aug 1|
All Science Journal Classification (ASJC) codes
- Mechanical Engineering