A generalized version of the hypersonic equivalence principle for viscous flows is implemented by using the direct simulation Monte Carlo (DSMC) method. The 3-dimensional steady hypersonic flow over a slender body could be reduced to a simplified 2-dimensional unsteady flow, as long as the high-speed velocity component perpendicular to the 2-dimensional plane is retained. As a result, the strongly sheared and high temperature boundary layer flow is induced, and the friction drag and aeroheating problem can be discussed. The DSMC method which is naturally unsteady, 3-dimensional and robust to the surface motion is very appropriate to implement this principle. Foundamental 1-dimensional Rayleigh flow, 2-dimensional Blasius flow and practical 3-dimensional complex interaction flow are studied based on the generalized hypersonic equivalence principle. This study indicates the feasibility of the dimensionality reduction in DSMC simulation of the complex hypersonic flows, as well as the potential application value of the generalized hypersonic equivalence principle for the friction force and aeroheating prediction.
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