Supersonic Complex Flowfield Parallel Analysis And High Order Schemes Study

In the paper, through the schemes studied and applied in model problems, the characters and some advice of ENO/WENO schemes in application were given; WENO scheme was improved to solve some problems in calculation. A new algorithm, which is high order, high-resolution and high efficient, was constructed by combining the LU method with ENO/WENO schemes; In this paper, a CFD systematic analytic concept was brought up. It emphasizes the basic steps and common used methods of the numerical uncertainty analysis in calculations. It make the base for mature CFD application; The OOP zone divided parallel calculations were realized on COWs and MPP system with the aid of MPI platform.The scarfed reversal nozzle is often used as the missile thrust ending device. It can efficiently achieve the goal to depart the .motor and the payioad. The design level of this nozzle is very important to improve the aiming accuracy of the missile and the ability of the weapon equipment; The supersonic open cavity is often used as flow control device. This structure can produce many good characteristics of gas dynamic, including decrease the drag, increase the mixing of combustion, and delay the boundary layer separation, et. But it also brings up strong pressure oscillation and sharp noises. The good design of this device is very important to accomplish flow control and stability of the aircraft construct.The contour of scarfed reversal nozzle has many discontinuous points and a step at supersonic zone. So it can generate a series of expand waves and shock waves, and accomplished with flows separation and reattach. Its' flowfield is complex three dimension turbulent flow; When supersonic gas flow over open cavity, it can produce complex unsteady flowfields. The internal and external regions are coupled via self-sustained shear-layer oscillations, coherent shed vorticity, unsteady weak shock or pressure waves.In order to get the accuracy results of the above complex flowfields, the CFD analysis ability should be improved. In this paper, some basic CFD problems are studied, including ENO/WENO schemes, CFD systematic analysis, object-oriented programming method and zone divided parallel algorithm. These methods enriched and advanced the CFD algorithms, and then these algorithms were applied in numerical applications of the scarfed reversal nozzle and the open cavity. This promotes the speed of the CFD algorithm combine with the project applications.Through 2D axial symmetrical and 3D scarfed reversal nozzle calculating, the main flowfield characters were given, and compared with the experiment data for validation. Then, the program was given, which can well predict the performance of the scarfed reversal nozzle.In this paper, the flowfields of open cavities with different structures and different parameters were calculated. Some new, fiill and more reasonable mechanism interprets were given. We think that the essential cause of pressure oscillatory is coherent effect of wave, eddy and cavity structure, but the procedure is different with different cavity structure, it can not use single procedure to described.