Hydrodynamic Instabilities in Gaseous Detonations: Comparison of Euler, Navier–Stokes, and Large-Eddy Simulation
作者： Y. Mahmoudi , N. Karimi , R. Deiterding , S. Emami
DOI: 10.2514/1.B34986
关键词: Dissipation 、 Non-dimensionalization and scaling of the Navier–Stokes equations 、 Physics 、 Mechanics 、 Hagen–Poiseuille flow from the Navier–Stokes equations 、 Euler's formula 、 Large eddy simulation 、 Numerical diffusion 、 Vorticity 、 Detonation
摘要: A large-eddy simulation is conducted to investigate the transient structure of an unstable detonation wave in two dimensions and evolution intrinsic hydrodynamic instabilities. The dependency on grid resolution investigated, structures obtained by are compared with predictions from solving Euler Navier–Stokes equations directly. results indicate that predict irregular agreement experimental observations vorticity generation dissipation small scale should be taken into account. Thus, high required. In a low scenario, which numerical diffusion dominates, or qualitatively similar. When employed, directly roughly similar yet equally disagreement results. For resolution, only predicts substructures correctly, fact attributed increased provided subgrid model. Specific investigated configuration, major differences observed occurrence unreacted gas pockets high-resolution computations, appear fully combusted when employed.
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