Advanced Aerodynamic Modelling for Flight Dynamics Applications

提出了一个为期三年的项目，以取得必要的进展，以便利用计算流体动力学进行飞行模拟。飞行器的飞行仿真是在求解牛顿第二运动定律的基础上进行的，飞行器的各种动力来源于重力和空气动力学，通常采用各种简化模型来表示空气动力。这些模型的生成可能需要大量的风洞测试。作为一种替代方案，如果模拟本身可以执行得足够快，则可以使用计算机模拟来生成必要的数据。本提案的第一部分是基于欧拉方程的非线性频域方法开发和演示数据集生成的快速方法。一种非线性频域方法将被实施，以允许快速生成当前飞行动力学模拟的数据集。此外，CFD模拟将用于直接为牛顿第二定律提供气动力，允许对气动力进行一般处理，而无需简化，这可能是更简单方法所固有的。然而，直接耦合模拟在计算上是非常昂贵的，并且可能只有在极端机动时才有必要。将对这两种方法进行适度和极端操作的评估。来自国防部的数据集将用于CFD预测的初始验证，随后是通用的Hawk教练机模型，最后是拟议的FLAVIIR演示飞行器。将与克兰菲尔德的飞行动力学专家密切合作，以确保工作与当前的飞行模拟实践兼容，并最大限度地立即利用该项目的结果。该项目的费用为197,911。

A three year project is proposed to make the advances necessary to allow the exploitation of Computational Fluid Dynamics for the simulation of flight. Flight simulation is based on solving Newton's second law of motion for the aircraft which various forces arising from gravity and aerodynamics, Various simplified models are normally used to represent the aerodynamic forces. The generation of these models can require substantial wind tunnel testing. As an alternative it is possible that computer simulation can be used to generate the necessary data if the simulation itself can be made to execute fast enough. The first part of this proposal is to develop and demonstrate a fast method for data set generation, based on a nonlinear frequency domain method for the Euler equations. A nonlinear frequency domain method will be implemented to allow the rapid generation of datasets for current flight dynamics simulations. Further the CFD simulation will be used to directly provide the aerodynamic forces to Newton's second law, allowing a general treatment of the aerodynamic forces without the simplifications which can be inherent in simpler approaches. The directly coupled simulation is however computationally very expensive and is likely to be necessary only for extreme manoeuvres. These two approaches will be evaluated both for moderate and extreme manoeuvres. A dataset from the MoD will be used for initial validation of the CFD predictions, followed by a generic Hawk trainer model and concluding with the proposed FLAVIIR demonstrator vehicle. Close collaboration with flight dynamics experts at Cranfield will be exploited to ensure that the work is compatible with current flight simulation practice and that maximum immediate exploitation of the results of the project is made. The cost of the project is 197,911.