Numerical simulation and analysis of three-dimensional turbulent impingingsquare twin-jet flow field with no-crossflow

The three-dimensional turbulent impinging square twin-jet flow with no-cros sflow is analyzed by employing the computational fluid dynamics (CFD) code PHOENICS. The SIMPLEST algorithm and the Jones-Launder k-epsilon two-equati on turbulence model are used to simulate the strong turbulence of the three -dimensional impinging twin-jet flow field. The transport properties of vel ocity, pressure, and structure of exhausted nozzles at a space of S = 5D, j et exit height of H = 3D, and main nozzle jet Reynolds number of 105000 are solved in this paper. The axial velocities of the present calculated resul ts are found to be in good agreement with the experimental data of Barata e t al. [Barata JMM, Durao DFG, Heitor MV. Impingement of single and twin tur bulent jets through a crossflow. AIAA Journal 1991; 29: 595-602]. The calcu lated results show that the flow field structure of twin-jet impinging on a flat surface is strongly affected by the depth of geometry. Also, the calc ulated results show that several recirculating zones are distributed around the flow field. Their size and location are different from the two-dimensi onal flow field due to the effect of flow stretching in the gamma-direction . In addition, fountain upwash flow is extended to the narrow region of the outer boundary. The phenomena in the present analysis provide a fundamenta l numerical study of three-dimensional impinging twin-jet flow fields and a basis for the further analysis of three-dimensional impinging twin-jet flo w fields with a variable angle nozzle and plate. Copyright (C) 2000 John Wh ey & Sons, Ltd.