Simulation of longitudinal vortices in high-lift of transport aircraft-

现代运输机经常使用位于发动机短舱处的涡流发生器，以抑制主翼上的局部边界层分离。由于缺乏一个有效的模拟策略，使得在典型的飞机飞行雷诺数下的应用，因此，对这些纵向涡及其对机翼的影响进行可靠的预测是不可能的。该项目的目标是建立一个有充分根据的方法，用于高升力布局中机翼的数值流动预测，其中边界层与纵向涡相互作用。模拟方法将通过风洞实验进行验证。将分析实验和数值数据库，以获得有关涡流和逆压梯度边界层的不同流动尺度在整个相互作用现象中所起作用的新知识。分析将特别量化非定常涡漂移的影响，这是以前在风洞实验和飞行过程中观察到的。所追求的方法包括一个自适应的，混合RANS-LES模型，该模型使用雷诺应力模型的湍流RANS区域和壁模型LES的区域尺度分辨湍流。该模型将被用来回答这个问题，是否一个自由的纵向涡和边界层的相互作用与不利的压力梯度必须模拟的混合，规模解决的方法，或主要的影响可能是定性和定量表示的一个合适的雷诺应力模型。

Modern transport aircraft often use vortex generators located at the engine nacelle in order to suppress local boundary layer separations on the main wing. A reliable prediction of these longitudinal vortices and their effects on the wing is not possible today due to the lack of a validated simulation strategy that would allow applications at the typical Reynolds numbers of aircraft flight. The project objective is the establishment of a well-founded methodology for numerical flow prediction of wings in the high-lift configuration, where the boundary layer interacts with a longitudinal vortex. The simulation methodology will be validated with a wind tunnel experiment. The experimental and numerical data base will be analysed for new knowledge about role that the different flow scales of the vortex and the adverse-pressure-gradient boundary layer assume in the overall interaction phenomenon. The analysis will particularly quantify the effects of unsteady vortex wandering, which has been previously observed in wind tunnel experiments and during flight. The aspired methodology consists of an adaptive, hybrid RANS-LES model that uses a Reynolds stress model of turbulence for the RANS region and a wall-modelled LES for the region with scale resolved turbulence. The model will be used to answer the question, whether the interaction of a free longitudinal vortex and the boundary layer with an adverse pressure gradient must be simulated with a hybrid, scale resolving approach, or the major effects may be qualitatively and quantitatively represented by a suited Reynolds stress model.