Dynamic Derivatives Analysis Based On The Detached Eddy Simulation

According to the complex missions of modern aircrafts,There is an increasing tendency for researchers to pay much attention to the dynamic derivatives.One of the most popular problems is the massively seperated flows,which may induce the crosswise and lengthwise instability,and has a negative influence on the flying performance.Hitherto,it is still very difficult to simulate this kind of flows percisely,and it is uncommon to get the high fidelity results,one of the most important factors is the complicated turbulent flow,which puts a huge barrier to the numerical simulation.DNS,RANS and LES are three major numerical simulation methods to turbulent flow.Due to the heavy burden on computer resources,it is difficult to apply DNS to practical situation;on the contrary,RANS is widedly used in practical situation,while it still have to face the problem to simulate the complicated turbulent flow,such as massively separated flow,preciously.LES still puts a huge burden on the computer resources,when tackle with near wall flow.To solve the problem,one of the engineering methods with bright future,Detached Eddy Simulation,is used in the dissertation.Firstly,Based on the popular used SA model of RANS methods,the DES model,DDES model and IDDES model can be used.The fidelity of the model can be identified by the standard examples,including flow pass circular cylinder,Stall flow over NACA0012 at various angle and flow over an dynamic pitching NACA0012 airfoil.Compared with the SA model,the results show that the DES model has an advantage in massively seperated flows,while has a comon performance in the field of attached flows.Secondly,the research on the methods of dynamic derivatives computaion has been made,and the fidelity can be tested with the standard examples,such Army-Navy spinner rocket and Hyper Ballistic Shape.Finally,the DES model can be used in the numerical simulation of HRV shaped reentry capsule.The numerical simulation shows an accepted results compared with the experimental results,which contribute to the further development of DES model.