A low-Reynolds-number, four-equation heat transfer model for turbulent separated and reattaching flows

✍ Scribed by Gwang Hoon Rhee; Hyung Jin Sung

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 667 KB
• Volume: 18
• Category: Article
• ISSN: 0142-727X
• DOI: 10.1016/s0142-727x(96)00137-3

✦ Synopsis

An algebraic heat flux model is applied to predict turbulent heat transfer in separated and reattaching flows. Based on the prior low-Reynolds-number k-s model of Park and Sung (1995), an improved version of the nonequilibrium heat transfer model is developed. The model performance is examined by solving the equations of the temperature variance k 0 and its dissipation rate ~0, together with the equations of k and e. In the present model, the near-wall limiting behaviour close to the wall and the nonequilibrium effect away from the wall are incorporated. A tensor eddy-diffusivity is obtained to implement the orientation of mean temperature gradient in separated and reattaching flows. The validation of the model is applied to the turbulent flow over a backward facing step. The predictions of the present model are cross-checked with the existing measurements and direct numerical simulation (DNS) data. The model performance is shown to be generally satisfactory.