Transactions of Nanjing University of Aeronautics & Astronautics
Development of a Synchronization Method for Fluid-Thermal Study of Hypersonic Flow
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Abstract:
A synchronization method is developed for the fluid-thermal study of hypersonic flow. Different from conventional loosely/tightly coupled methods which separately deal with the flow field and the structure temperature field, the presented method expresses the governing equations in a unified framework so that the two fields can be calculated simultaneously. For efficiently solving the unified equations, the finite volume method together with the dual-time stepping approach is employed. Like in the flow field, the local time step is also used in the temperature field, which is determined from thermal conductivity spectral radii. In order to treat the fluid-structure interface more conveniently, an expanded virtual boundary is introduced. For validation, several fluid-thermal hypersonic flow problems are simulated. The computed results are compared with those obtained from the coupled methods and the experiment. In the continuous heating problems, the stagnation temperatures predicted by both the coupled and synchronization methods are in good agreements with the experimental data. In the unsteady flow-thermal hypersonic flows, the stagnation heat fluxes predicted by the presented method and tightly coupled method are basically the same, which agree better with the experimental data than those predicted by the loosely coupled method. In terms of prediction of the stagnation temperature, the synchronization method shows better accuracy than the tightly coupled method.
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Clc Number:
O551.3
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