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| Received:August 10, 2007 |
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| DOI：10.7511/jslx20095022 |
| KeyWord:transition turbulence compressible mixing layer large eddy simulation direct numerical simulation |
| Author | Institution |
| 潘宏禄 |
航天空气动力技术研究院,北京 |
| 史可天 |
航天空气动力技术研究院,北京 |
| 马汉东 |
航天空气动力技术研究院,北京 |
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| Abstract: |
| The transition process and full turbulence mechanism of compressible mixing layers in convective Mach number 0.4 is investigated by spatial large eddy simulation (LES). The evolution of instable structures is analyzed. The numerical method is studied with a hybrid method of a fifth-order upwind compact difference and a sixth-order symmetric compact difference for the three-dimensional compressible Favre-filtered Navier-Stokes equations. The compact storage third-order explicit Runge-Kutta method is applied for time-integration. The sub-grid scales are formulated according to the modified Smagorinsky eddy-viscosity model. The instant and statistical parameters are discussed in detail, and the numerical results show a good agreement with the relevant literatures and theory. The computational results show that the most instable disturbance mechanism is mainly induced by 2-D wave perturbation in current convective Mach number. These results present that LES can simulate translation mechanism of mixing layers well. |
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