Large-eddy simulation of stably stratified flow past a rectangular cylinder in a channel of finite depth. Issue 170 (November 2017)

• Record Type: Journal Article
• Authors: Dong, Haotian; Cao, Shuyang; Ge, Yaojun
• Is Part Of: Journal of wind engineering and industrial aerodynamics. Issue 170(2017)
• Page Start: 214
• Page End: 225
• Publication Date: 2017-11
• Subjects: Aerodynamic force -- Large-eddy simulation -- Rectangular cylinder -- Stationary internal wave -- Stratified flow; Wind-pressure -- Periodicals; Buildings -- Aerodynamics -- Periodicals; Pression du vent -- Périodiques; Constructions -- Aérodynamique -- Périodiques; Buildings -- Aerodynamics; Wind-pressure; Periodicals
• DOI: 10.1016/j.jweia.2017.08.019
• Languages: English
• ISSNs: 0167-6105

Abstract

Abstract: Large-eddy simulation is performed to investigate an incompressible stratified flow with a linear temperature gradient past a rectangular cylinder with side ratio b / h = 0.6, where b and h are its breadth and depth, respectively. Simulations are performed for Reynolds number Re = 8, 400 with respect to a series of stratification numbers K . Results show that transition of stratification effect occurs at around K = 2 due to the occurrence of second-order stationary internal waves. Both Strouhal number St and drag coefficient C D decrease with stratification number K when K < 2 due to suppression of vertical motion, but increase with K when K > 2 because of the stationary internal waves. The relationship between the fields of temperature and other flow parameters are studied and a coincidence of temperature field with internal wave is observed at high stratification number. Finally the stratification effect on the vortex street is discussed. Highlights: Large-eddy simulation is conducted to study a linearly-temperature-stratified flow past a b/h = 0.6 rectangular cylinder. A two-stage process is observed in the variation of flow pattern and aerodynamic parameters with stratification number. A coincidence of temperature field with internal wave occurs at high stratification number.