| Autor: |
Jie Liang, Zhihui Li, Xuguo Li, Boqiang Du Ming Fang |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2016, Vol. 1786 Issue 1, p1-8, 8p, 8 Color Photographs, 1 Black and White Photograph, 2 Charts, 1 Graph |
| Abstrakt: |
The implementation of a collision limiter DSMC-based hybrid approach is presented to simulate hypersonic near-continuum flow. The continuum breakdown parameters based on gradient-length local Knudsen number are characterized different regions of the flowfield. The collision limiter is used in continuum inviscid regions with large time step and cell size. Local density gradient-based dynamic adaptation of collision and sampling cells refinement is employed in high gradient regions including strong shocks and boundary layer near surface. A variable time step scheme is adopted to make sure a more uniform distribution of model particles per collision cell throughout the computational domain, with a constant ratio of local time step interval to particle weights to avoid particles cloned or destroyed when crossing interface from cell to cell. The surface pressure and friction coefficients of hypersonic reentry flow for a blunt capsule are computed in different conditions and compared with benchmark case in transitional regime to examine the efficiency and accuracy. The aerodynamic characteristics of a wave rider shape with sharp leading edge are simulated in the test state for hypersonic near-continuum. The computed aerodynamic coefficients have good agreements with experimental data in low density wind tunnel of CARDC and have less computational expense. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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