Stabilization of Lattice Boltzmann BGK Method for high Rayleigh Natural convection
Publish place: Fourth National Conference on Applied Research in Electrical Engineering, Mechanics, Computer and Information Technology
Publish Year: 1397
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
EMCE04_138
تاریخ نمایه سازی: 21 خرداد 1398
Abstract:
In this article a relaxation time method is introduced to solve natural convection problems. A two dimensional square differentially heated cavity filled with air (Pr=0.71) is presented to illustrate that Lattice Boltzmann BGK method (LBGK) is stable at low lattice numbers and without any turbulent models. Furthermore, Multiple-Relaxation-time (MRT) methods with significantly high Rayleigh numbers (up to RA=109) are stable and in accordance with previous researches in the literature. The importance of having a method to choose relaxation times is then shown. The best relaxation time is selected based on the Rayleigh number (Ra), specified Prandtl number (Pr) and chosen Lattice size (number of Lattices). Consequently, the power of the method described in this article is emphasized.
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Authors
Seyed Davood Mahallatian Babaki
echanical engineering expert in technical office, Sirjan Iranian Steel Co. (SISCO), Sirjan, Iran