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Research project: Simulation of the unsteady shock-induced combustion on a mapped mesh

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Shock-induced combustion (SIC) is a phenomenon that the combustion is self-ignited by a shock wave in a reactive mixture. In this project, simulations based on the generic framework for blockstructured Adaptive Mesh Refinement in Object-oriented C++ (AMROC), are extended for the mapped meshes. The unsteady SIC problems at varying Mach number are simulated with detailed chemical-kinetic mechanisms.

In the unsteady SIC problem, the shock is generally driven by a wedge or spherical projectile travelling at a high velocity. The unburned mixture behind the shock is compressed, as a result, chemical reactions are triggered.

A generic solver in our structured adaptive mesh refinement framework AMROC-Clawpack is extended to simulate this problem on a non-Cartesian mapped mesh. A second-order finite volume method is used with a grid-aligned Riemann solver for inviscid thermally perfect gas mixtures. To solve this reactive problem, detailed chemical kinetics are employed with a splitting approach. The prolongation and restriction operators are modified to implement the adaption algorithm on a mapped mesh.

The mesh is refined at the places where there is a large gradient of physical variables. All the waves and the reaction front are captured by the finest mesh.

In the simulations, the shock wave and reaction front stand-off distance is similar with that in a previous experiment. The computed oscillation frequencies, observed in the stagnation point pressure, are in good agreement with the frequencies from experiments when the inflow is subdetonative.

Temperature and refinement levels distribution
Temperature and refinement levels distribution
Comparison between simulation and experiment
Comparison between simulation and experiment
Comparison of the oscillation frequency
Comparison of the oscillation frequency

Related research groups

Aerodynamics and Flight Mechanic (AFM)
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