Wake Vortex Model for Real-Time Flight Simulation Based on Large Eddy Simulation

摘要

An alternative approach is presented to represent a counter-rotating vortex pair for wake vortex interaction in a real-time flight simulation. Rather than using an analytical model, the model directly accesses a precomputed three-dimensional time-varying dataset. This dataset is generated using implicit large eddy simulations on unstructured grids. The methodology enables a realistic vortex decay to be reproduced with the apparition of short- and long-wave instabilities. The vortex model based on these simulations is designed to run on a personal computer and is integrated with a six-degree-of-freedom real-time flight simulator. The paper combines the use of large eddy simulation data as the basis of a wake vortex encounter model with methods to access the dataset in real time. The second half of this paper describes the data compression scheme implemented to reduce the size of the time-varying dataset. Additionally, rapid data access and issues regarding the real-time data management aspects are discussed. Analysis of the performance of the model is made and preliminary comparisons with a traditional analytical wake vortex model are discussed.