Metastable and unstable hydrodynamics in multiphase lattice Boltzmann

Lulli, Matteo1,2; Biferale, Luca3,4; Falcucci, Giacomo5,6; Sbragaglia, Mauro3,4; Yang, Dong1; Shan, Xiaowen1,7

2024-04-15

10.1103/PhysRevE.109.045304

PHYSICAL REVIEW E   影响因子和分区

2470-0045

2470-0053

Metastability in liquids is at the foundation of complex phase transformation dynamics such as nucleation and cavitation. Intermolecular interaction details, beyond the equation of state, and thermal hydrodynamic fluctuations play a crucial role. However, most numerical approaches suffer from a slow time and space convergence, thus hindering the convergence to the hydrodynamic limit. This work shows that the Shan -Chen lattice Boltzmann model has the unique capability of simulating the hydrodynamics of the metastable state. The structure factor of density fluctuations is theoretically obtained and numerically verified to a high precision, for all simulated wave vectors, reduced temperatures, and pressures, deep into the metastable region. Such remarkable agreement between the theory and simulations leverages the exact implementation at the lattice level of the mechanical equilibrium condition. The static structure factor is found to consistently diverge as the temperature approaches the critical point or the density approaches the spinodal line at a subcritical temperature. Theoretically predicted critical exponents are observed in both cases. Finally, the phase separation in the unstable branch follows the same pattern, i.e., the generation of interfaces with different topology, as observed in molecular dynamics simulations.

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China["12050410244","92152107"] ; Department of Science and Technology of Guangdong Province[2020B1212030001] ; Shenzhen Science and Technology Program[KQTD20180411143441009]

Physics

Physics, Fluids & Plasmas ; Physics, Mathematical

WOS:001221328700005

AMER PHYSICAL SOC

PHYSICS

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China
2.Chinese Univ Hong Kong, Dept Phys, Sha Tin, Hong Kong, Peoples R China
3.Univ Roma Tor Vergata, Dept Phys, Via Ric Sci 1, I-00133 Rome, Italy
4.Univ Roma Tor Vergata, Ist Nazl Fis Nucl, Via Ric Sci 1, I-00133 Rome, Italy
5.Univ Roma Tor Vergata, Dept Enterprise Engn Mario Lucertini, Via Politecn 1, I-00133 Rome, Italy
6.Harvard Univ, John A Paulson Sch Engn & Appl Phys, 33 Oxford St, Cambridge, MA 02138 USA
7.BNU HKBU United Int Coll, Inst Adv Study, Zhuhai 519088, Guangdong, Peoples R China

Lulli, Matteo,Biferale, Luca,Falcucci, Giacomo,et al. Metastable and unstable hydrodynamics in multiphase lattice Boltzmann[J]. PHYSICAL REVIEW E,2024,109(4).

Lulli, Matteo,Biferale, Luca,Falcucci, Giacomo,Sbragaglia, Mauro,Yang, Dong,&Shan, Xiaowen.(2024).Metastable and unstable hydrodynamics in multiphase lattice Boltzmann.PHYSICAL REVIEW E,109(4).

Lulli, Matteo,et al."Metastable and unstable hydrodynamics in multiphase lattice Boltzmann".PHYSICAL REVIEW E 109.4(2024).