پديد آورنده :
رحمتي،احمدرضا
عنوان :
بهبود پايداري روش شبكه بولتزمن در شبيه سازي جريان هاي گرمايي مغشوش در اعداد رايلي بزرگ
محل تحصيل :
اصفهان،داشگاه صنعتي اصفهان،دانشكده مكانيك
صفحه شمار :
بيست و نه،332ص.:مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محمود اشرفي زاده
استاد مشاور :
ابراهيم شيراني
توصيفگر ها :
مدل گرمايي شبكه بولتزمن , شبيه سازي گردابه هاي بزرگ
تاريخ نمايه سازي :
89/1/23
استاد داور :
مسعود دربندي،علي اكبر عالم رجبي،احمدرضا پيشه ور اصفهاني
كد ايرانداك :
ID284 دكتري
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Stability Improvement of Lattice Boltzmann Method for Simulation of High Rayleigh Turbulent Thermal Flows Ahmad Reza Rahmati Email rahmati@me iut ac ir Date of Submission 2010 01 23 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Supervisor Mahmud Ashrafizaadeh mahmud@cc iut ac ir Advisor Ebrahim Shirani eshirani@cc iut ac ir Department Graduate Coordinator Mehdi Keshmiri Department of Mechanical Engineering Isfahan University of Technology Isfahan IranAbstract In this study stability analysis of lattice Boltzmann methods has been investigated forsimulation of high Ra no turbulent thermal flow problems and a stable model has beenproposed The following issues related to simulate these problems using lattice Boltzmannmethod were investigated total number of links of lattice model stability improvementtechniques turbulence modeling compressibility effects thermal lattice Boltzmann modelsand implementation of boundary conditions In two dimensional case a combination modelhas been suggested and applied on a non uniform mesh This model is composed of 1 D2Q9lattice model 2 Multi Relaxation Time Lattice Boltzmann MRT LB model 3 Incompressible LB model Guo based 4 LES in conjunction with Smagorinsky and mixedscale viscosity sub grid models 5 Hybrid thermal lattice Boltzmann model 6 Mid gridboundary conditions and 7 Application of the TLLBM technique on non uniform mesh Tovalidate the proposed model a turbulent RBC flow has been simulated at different Ranumbers up to 1015 for Prantdl number of 0 71 Besides in three dimensional case acombination model has been proposed This model consists of 1 D3Q19 lattice model 2 Fractional Volumetric Multi Relaxation Time Lattice Boltzmann FV MRT LB model 3 Incompressible LB model Guo based 4 LES in conjunction with Smagorinsky andviscosity mixed scale sub grid models 5 Hybrid thermal lattice Boltzmann model and 6 Mid grid boundary conditions To verify the proposed model a turbulent NC flow issimulated at different Ra numbers up to 1015 for Prantdl number of 0 71 The results showthat the proposed models produce accurate results at low Ra number flows and are stable athigh Ra number flow problems Keywords Lattice Boltzmann method thermal LBM stability of LBM LES Rayleigh number
استاد راهنما :
محمود اشرفي زاده
استاد مشاور :
ابراهيم شيراني
استاد داور :
مسعود دربندي،علي اكبر عالم رجبي،احمدرضا پيشه ور اصفهاني
