4256

4027

كارشناسي ارشد

تبديل انرژي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1387

نه، 68، [II]ص.: مصور، نمودار

ص. ع. به: فارسي وانگليسي

محمود اشرفي زاده

علي اكبر عالم رجبي

23/07/1387

ابراهيم شيراني، احمد صابونچي

مهندسي مكانيك

ID4027

به فارسي وانگليسي: قابل رويت در نسخه ديجيتال

69AbstractNavier Stocks Equations are being used for years in fluid Dynamics as the basic equations There arealmost three decades that the most basic equations of Lattice Boltzmann are growing their usagefrom fundamental science like Physics and Mathematics to more applicable knowledge which isengineering The reason of this growing is the need of more precise solution for Micro and Nano scale fluid flows After that Lattice Boltzmann Method LBM has been used in different areas ofFluid Dynamics Then the vast effort for improving this method leads to invention of Multi blockLBM in the recent years The Standard LBM uses a uniform mesh in the whole domain therefore when more accuracy isneeded in some special parts of the domain the whole domain s mesh should be made finer Thiscauses an exponential growth in the computational cost which its rate is the ratio of lattice spacebetween two mesh systems To resolve this problem in the Multi Block LBM a domain is dividedinto some independent blocks which could have different sizes Therefore in the place wheregradients are higher and therefore finer mesh is needed a local mesh refinement could be appliedonly to the desired blocks For applying this method to fluid mechanics in present work some benchmark problems have beenused Each benchmark has its own property which needs special care in applying this method At firstthe lid driven cavity fluid flow has been studied Then the transient fluid flow around a cylinder in2D channel has been solved As a last example the flow through a backward facing step is simulated In each problem there are some parameters which could be used as the comparing quantity In all ofthese benchmarks the multi block results agree well with these obtained using standard LBM Insome cases great improvement in accuracy was observed

محمود اشرفي زاده

علي اكبر عالم رجبي

ابراهيم شيراني، احمد صابونچي