Numerical simulation of flow around high-lift device based on zonal patched-grid technology

Due to the complexity of the configuration and flow field of high-lift devices, the flow filed is divided into small domains based on the topology of the configuration and the characteristics of the flow. The mesh is set up part by part based on zone, and the difficulty of the generation of grid is decreased, the number is also decreased. The strategy of dividing and characteristic of flow field around the high-lift device is studied firstly. Then by choosing the MD 30P-30N multi-element airfoils as the computational model, the proportion of the mesh and the interposition method which will affect the precision and stability is studied. The scale between outer area and near wall zone should less than 1:5; the scale of the near wall zone should less than 1:1.8; the high accurate interpolation method should be used. A multi-element airfoil is chosen to test the method. Finally, the flow around NASA high-lift model is simulated based on patched-grid technology. The results are compared with wind tunnel experimental data and the results computed by 1 to 1 multi-block structural grid. It is proved that patched-grid technology is reliable and efficient. At the same time, the viscous flow around the high-lift device is also studied.