| Title | Discrete Boltzmann modeling of Rayleigh-Taylor instability in two-component compressible flows |
| Authors | Lin, Chuandong Xu, Aiguo Zhang, Guangcai Luo, Kai Hong Li, Yingjun |
| Affiliation | Tsinghua Univ, Dept Thermal Engn, Minist Educ,Key Lab Thermal Sci & Power Engn, Ctr Combust Energy, Beijing 100084, Peoples R China. China Univ Min & Technol, State Key Lab GeoMech & Deep Underground Engn, Beijing 100083, Peoples R China. Fujian Normal Univ, Coll Math & Informat, Fuzhou 350007, Fujian, Peoples R China. Fujian Normal Univ, FJKLMAA, Fuzhou 350007, Fujian, Peoples R China. Inst Appl Phys & Computat Math, Lab Computat Phys, POB 8009-26, Beijing 100088, Peoples R China. Peking Univ, Coll Engn, Ctr Appl Phys & Technol, MOE Key Ctr High Energy Dens Phys Simulat, Beijing 100871, Peoples R China. UCL, Dept Mech Engn, Torrington Pl, London WC1E 7JE, England. Tsinghua Univ, Dept Thermal Engn, Minist Educ,Key Lab Thermal Sci & Power Engn, Ctr Combust Energy, Beijing 100084, Peoples R China. Lin, CD (reprint author), China Univ Min & Technol, State Key Lab GeoMech & Deep Underground Engn, Beijing 100083, Peoples R China. Lin, CD (reprint author), Fujian Normal Univ, Coll Math & Informat, Fuzhou 350007, Fujian, Peoples R China. Lin, CD (reprint author), Fujian Normal Univ, FJKLMAA, Fuzhou 350007, Fujian, Peoples R China. |
| Keywords | LATTICE-BOLTZMANN FLUID SIMULATIONS INTERFACE EQUATION |
| Issue Date | 2017 |
| Publisher | PHYSICAL REVIEW E |
| Citation | PHYSICAL REVIEW E. 2017, 96(5). |
| Abstract | A discrete Boltzmann model (DBM) is proposed to probe the Rayleigh-Taylor instability (RTI) in two-component compressible flows. Each species has a flexible specific-heat ratio and is described by one discrete Boltzmann equation (DBE). Independent discrete velocities are adopted for the two DBEs. The collision and force terms in the DBE account for the molecular collision and external force, respectively. Two types of force terms are exploited. In addition to recovering the modified Navier-Stokes equations in the hydrodynamic limit, the DBM has the capability of capturing detailed nonequilibrium effects. Furthermore, we use the DBM to investigate the dynamic process of the RTI. The invariants of tensors for nonequilibrium effects are presented and studied. For low Reynolds numbers, both global nonequilibrium manifestations and the growth rate of the entropy of mixing show three stages (i.e., the reducing, increasing, and then decreasing trends) in the evolution of the RTI. On the other hand, the early reducing tendency is suppressed and even eliminated for high Reynolds numbers. Relevant physical mechanisms are analyzed and discussed. |
| URI | http://hdl.handle.net/20.500.11897/497597 |
| ISSN | 2470-0045 |
| DOI | 10.1103/PhysRevE.96.053305 |
| Indexed | SCI(E) |
| Appears in Collections: | 工学院 |
