Numerical simulation of turbulent flow over triangle riblets

Turbulent drag exists in the flow transport, aviation and navigation fields and is the most energy consumption. Twenty-six flow field over triangle riblet with α = 60°, s = 0.1 mm and h = 8.66 × 10-2 mm are computed with finite volume method in single computational domain. B-L model in near wall and RSM (Reynolds stress model) are applied. Reliability and precision of simulation can be proved because the simulation result is in good agreement with existing experimental data and with theory computation result, which provides feasibility for simulating flow field over biomimetic non-smooth surface with software. In addition, numerical simulations of turbulent flow over riblet surface are carried out in 7 kinds of pressure gradients. The effect of pressure gradient is analyzed.