Evaluation of Shan-Chen lattice Boltzmann model on simulation of multiphase flows in largedensity ratios

The simulation of Multiphase flows is one of the mostchallenging problems in engineering and industries, dueto complexity and applicability of such flows. In thispaper, the exact difference method (EDM) and theCarnahan-Starling equation of state are coupled in theShan-Chen multiphase lattice Boltzmann model, whichis suitable for simulation of high liquid/vapor densityratio multiphase flows. Some major test cases such as theLaplace test, the Bubbles coalescence, the Spreading,and the splashing a drop in liquid film are considered inhigh density ratios (۸۰۰ and ۸۴۰۰). It is found out thatthe Shan-Chen model is able to simulate large densityratio flows very well in more simulations like theLaplace test and the drop splashing, but it has somedisadvantages such as interface oscillation. Meanwhile,as the density ratio goes up the interface oscillation andconvergence time increase dramatically. Although thismodel enjoys the ability to simulate high density ratio instatic cases accurately, its performance declines for moresophisticated problems because of large changes ininterface boundary and instability of vapor densityprediction. In spite of some drawbacks, this model is apowerful tool for simulation of high density ratio and theresults show it can simulate multiphase flows with largerdensity ratios in comparison with other multiphaselattice Boltzmann models.

کلیدواژه ها:

Lattice Boltzmann method ، Shan-Chenmodel ، multiphase flows