Parallel Simulation Of Complex Chemical Reaction Flows

The high precision, high efficiency and steady numerical simulation is one of the most important complex chemical reaction flow researches. In the thesis, complex chemical reaction flows were studied by parallel numerical method, including: numerical simulation based on the Navier-Stokes equations with detailed elementary chemical reaction; the dynamic unstructured mesh based on spring method and local remeshing method; parallel arithmetic based on PC-Cluster system. The following content were studied:1) The shock and shear layer can be differentiated by the high precision format based on the finite volume formulation and unstructured mesh; the chemical reactions were dealt with elementary reaction model; the substance diffusion and energy transfer were also computed by the finite volume method. Standing oblique detonation waves induced by an accelerating projectile with attack angle were simulated numerically, the results are compared well with the data of the experiments.2) The large displacement movable boundary in chemical reaction flows was simulated by the combination of spring method and local remeshing method. Spring method was sufficient for relative small boundary displacement; local remeshing method was used to deal with large boundary displacement. The flow properties were integral calculated by the initial mesh. The unstructured dynamic mesh was applied to simulate high under-expanded muzzle jet flow, the precursor flowfield, propellant gas flowfield, the interaction of projectile and jet or jet and blast wave, the form and development of muzzle flash, the results were satisfactory.3) High precision format, unstructured dynamic mesh with a large displacement and multi-species gas flows were computationally expensive, the problem of resourceless and inefficient of single computer appeared. Parallel arithmetic based on PC-Cluster system for the oblique detonation wave flow and the muzzle flow include high speed projectile were discussed. The results proved that the rationality of parallel arithmetic provided a new method to simulate the complex chemical reaction flows. The present code represents a validated, efficient and versatile tool developed for the simulation of hypersonic multi-species chemical non-equilibrium flows.