EUROLIFT II Task 3.2 - Unstructured Grid with Structured Elements in Special Regions -

Abstract

Within the European project EUROLIFT II this work investigates the performance of unstructured grids with structured elements at special regions of a complex high-lift system. For this especially the leading edges of the high-lift elements and the through flow nacelle are meshed using hexahedrons. Besides, hexahedral boxes around the strake wake and the slat horn wake are used. This study shows that unstructured grids with structured elements can improve the aerodynamic flow computation by maintaining the grid size. Using hexahedral boxes around the wakes the structure and the strength of the vortices can be better resolved, especially downstream, because of the less dissipation of structured grids. With it, the influences of the wakes on the high-lift elements can be noticeable improved. In general for this configuration using hexahedrons a better convergence especially at high angle of attack can be achieved. As well, the maximum lift coefficient is shifted to higher angle of attack which leads to a better agreement with experiments.