TY - JOUR
T1 - Lattice Boltzmann simulation of cavitating bubble growth with large density ratio
AU - Chen, Xiao Peng
AU - Zhong, Cheng Wen
AU - Yuan, Xu Long
PY - 2011/6
Y1 - 2011/6
N2 - Natural cavitation is defined as the formation of vapor bubbles in a flow due to the pressure falling below the liquid's vapor pressure. The inception of the cavitation bubble is influenced by a lot of aspects, such as impurities, turbulence, liquid thermal properties, etc. In this paper, the exact difference method (EDM) and the CarnahanStarling real-gas equation of state (EOS) are coupled in the ShanChen multiphase lattice Boltzmann model, which is validated as being suitable for simulating high liquid/vapor density ratio multiphase flows. The 2D cavitation "bubble" growth is simulated under a quiescent and shear flow in the inception stage. Besides yielding the large density ratio, the real-gas EOS also leads to apparently different compressibilities for liquid and vapor. The results agree with RayleighPlesset predictions much better than those of a previous publication [X. Chen, Simulation of 2D cavitation bubble growth under shear flow by lattice Boltzmann model, Communications in Computational Physics 7 (2010) 212223]. In the meantime, a comparison is conducted for single-bubble behavior under different shear rates, with reduced temperature TTcritical=0.6891 and relaxation time τ=1.0. The simulation results show that the cavitation bubble deformation is consistent with the bubble dynamics, D∝Ca, where D and Ca are the bubble deformation and the capillary number respectively. The shear rate hardly influences the bubble growth rate.
AB - Natural cavitation is defined as the formation of vapor bubbles in a flow due to the pressure falling below the liquid's vapor pressure. The inception of the cavitation bubble is influenced by a lot of aspects, such as impurities, turbulence, liquid thermal properties, etc. In this paper, the exact difference method (EDM) and the CarnahanStarling real-gas equation of state (EOS) are coupled in the ShanChen multiphase lattice Boltzmann model, which is validated as being suitable for simulating high liquid/vapor density ratio multiphase flows. The 2D cavitation "bubble" growth is simulated under a quiescent and shear flow in the inception stage. Besides yielding the large density ratio, the real-gas EOS also leads to apparently different compressibilities for liquid and vapor. The results agree with RayleighPlesset predictions much better than those of a previous publication [X. Chen, Simulation of 2D cavitation bubble growth under shear flow by lattice Boltzmann model, Communications in Computational Physics 7 (2010) 212223]. In the meantime, a comparison is conducted for single-bubble behavior under different shear rates, with reduced temperature TTcritical=0.6891 and relaxation time τ=1.0. The simulation results show that the cavitation bubble deformation is consistent with the bubble dynamics, D∝Ca, where D and Ca are the bubble deformation and the capillary number respectively. The shear rate hardly influences the bubble growth rate.
KW - Bubble dynamics
KW - Cavitation
KW - Equation of state
KW - High density ratio
KW - Lattice Boltzmann method
KW - Phase transition
UR - http://www.scopus.com/inward/record.url?scp=79958813765&partnerID=8YFLogxK
U2 - 10.1016/j.camwa.2010.07.018
DO - 10.1016/j.camwa.2010.07.018
M3 - 文章
AN - SCOPUS:79958813765
SN - 0898-1221
VL - 61
SP - 3577
EP - 3584
JO - Computers and Mathematics with Applications
JF - Computers and Mathematics with Applications
IS - 12
ER -