9983

9213

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1393

يازده، 123ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محمود اشرفي زاده

سعيد مرتضوي، احمدرضا رحمتي

94/2/19

احمدرضا پيشه ور، محمدرضا توكلي

1396/09/27

كتابنامه

مكانيك

مهندسي مكانيك

ID9213

Lattice Boltzmann Model for Simulation of Multiphase Flows with Large Density Ratios Seyyed Meysam Khatoonabadi m khatoonabadi@me iut ac ir Date of Submission 2015 01 18 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Mahmoud Ashrafizaadeh mahmud@cc iut ac irAbstract The simulation of multiphase flows is one of the most challenging problems in engineering and industry In this research the Gong and Cheng and the Kupershtokh exact difference method EDM are applied for thepseudo potential Shan Chen model A study of various equations of state EOS is conducted to discover theGong and Cheng model applicability The proper beta parameter for each EOS is obtained by simulation andthen various EOS are compared In addition a function is proposed to predict the best parameter for theShan Chen and cubic EOS which is noticeably accurate in comparison with the obtained parameters bysimulation It is found out that by means of the predicted equation for noncubic EOS the proper parametersin different temperature ranges can be calculated Furthermore this method and the Carnahan Starlingequation of state are coupled in the Shan Chen multiphase lattice Boltzmann model and some major testcases such as the Laplace test the bubbles coalescence the squared bubble and the segregation are simulatedin high density ratios 800 and 8400 In addition the process of a droplet impact on a solid surface ismodeled by the Kupershtokh method at various Reynolds and Weber numbers The effect of a variety ofparameters such as the spread factor the pressure the density ratio the droplet thickness and the contactangel are studied The results illustrate a very good performance for the Shan Chen model for large densityratios It is found out that the Shan Chen model is able to simulate large density ratio flows quite well formost simulations such as the Laplace test However it has some disadvantages such as the interfaceoscillation Meanwhile as the density ratio increases the interface oscillation and the convergence timeincrease dramatically Although this model enjoys the ability to simulate high density ratio phenomena instatic cases accurately its performance deteriorates for more sophisticated problems because of large changesin the interface boundary and the instability of vapor density prediction In spite of some drawbacks thismodel is a powerful tool for the simulation of high density ratio flows and the results show that it cansimulate multiphase flows with larger density ratios in comparison with other multiphase lattice Boltzmannmodels Keywords Lattice Boltzmann method Shan Chen model Multiphase flows Equation of state

محمود اشرفي زاده

سعيد مرتضوي، احمدرضا رحمتي

احمدرضا پيشه ور، محمدرضا توكلي