4945

4659

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1388

ده، 78ص: جدول، نمودار

ص.ع. به: فارسي و انگليسي

محمود اشرفي زاده

احمد رضا پيشه ور

28/10/88

احمد صابونچي، سعيد مرتضوي

1396/09/25

كتابنامه

مهندسي مكانيك

ID4659

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

Simulation of compressible fluid flows with Lattice Boltzmann method for Curved Boundary Seyed mohsen paymard Moh paymard@me iut ac ir April 2009 Department of mechanical Engineering Isfahan University of Technology Isfahan 84156 83111Degree M Sc Language FarsiDr mahmud ashrafizadeh Assist Prof Supervisor mahmud@cc iut ac irAbstractThe main objective of the present thesis is the exhibition of a modified model of standard Lattice Boltzmann methodto simulate a compressible fluid flow In this method instead of limited velocity set for the particles a large velocityset has been used This velocity set are obtained from the addition of the mean velocity flow to lattice particlevelocity which are determines the destination of fluid particles on the lattice nodes The mentioned method inmacroscopic level and a wide range of high Mach number satisfies the continuum and N S equations Also theability of the mentioned method is increased by adding a suitable boundary condition for curved boundaries Therefore the possibility for simulating compressible fluid on airfoil is provided with appropriate accuracy To investigate the capabilities of mentioned method a computer program have been developed In the next step weapplied this program to simulate some problems In the first problem the flow has been simulated over a wedge with supersonic velocity in order to show the abilityof this method to make the oblique shock In the second problem the oblique shock reflection on an inviscid wallhas been simulated In this case the wall do not coincide with any grid line The numerical results have beencompared with the similar problem which the wall was on grid lines These results confirm the appropriate choosingof the boundary condition for curved boundary In the third problem the boundary layer flow has been simulated Furthermore the obtained boundary layer thickness has been compared with Blasius solution In the fourth problem interaction of an oblique shock with a viscous boundary layer has been simulated In the fifth problem the flow hasbeen simulated over inverse stair with supersonic velocity We observed that this method has the capability ofsimulating expansion waves on convex corner In the sixth problem the ability of the method in shock capturingwas demonstrated by simulating of flow over a forward facing step Finally in order to show other abilities of thismethod the flow over a NACA0012 airfoil with different boundary conditions has been simulated In the firstproblem of this case viscous flow with M 8 has been simulated The numerical results showed that thismethod has a good accuracy to simulate these problems In the second and third problem inviscid flow with M 1 2 and M 85 have been simulated The numerical results showed that this method is fairly accuratefor simulation of these problems In Consequence the obtained results confirm the ability of Lattice Boltzmannmethod in simulation of viscous and inviscid compressible fluid flows It is noticeable that the grid study is not possible in this method because the relaxation time is constant Key WordsLattice boltzmann Compressible flow Curve boundary Shock

محمود اشرفي زاده

احمد رضا پيشه ور

احمد صابونچي، سعيد مرتضوي