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| Gas kinetic scheme and numerical simulation of multiscale flows |
| Received:May 12, 2016 Revised:October 18, 2016 |
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| DOI：10.7511/jslx201701012 |
| KeyWord:GKS turbulent flows rarefied flows multiscale |
| Author | Institution |
| 谭爽 |
清华大学 航天航空学院, 北京 |
| 李诗一 |
清华大学 航天航空学院, 北京 |
| 李启兵 |
清华大学 航天航空学院, 北京 |
| 符松 |
清华大学 航天航空学院, 北京 |
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| Abstract: |
| The fundamental features of Gas Kinetic Scheme (GKS) and its application in two typical multiscale flows are introduced.In GKS the multiscale general solution of BGK equation is used to construct the numerical flux at a cell interface and then the multiscale method is developed which can achieve smooth transition between different physical models according to computational cell size.To simulate the macroscopic multiscale flow,for example,turbulence,the high-order accurate GKS is developed and successfully applied in the direct numerical simulation of low-Reynolds-number turbulence.For detailed simulation of high-Reynolds-number turbulence with high efficiency,a new multiscale framework is proposed based on the expanded BGK equation and existing RANS and LES models.To predict rarefied gas flow,the unified GKS is extended to three-dimensional curvilinear mesh and parallelized for large-scale computing.A UGKS for axisymmetric rarefied flow is also proposed.The present study demonstrates the GKS has an excellent performance and a promising prospect for high efficiency computation of multiscale flows. |
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