Open AccessStudy on lattice Boltzmann method/large eddy simulation and its application at high Reynolds number flow
Author(s) -
Haiqing Si,
Yan Shi
Publication year - 2015
Publication title -
advances in mechanical engineering/advances in mechanical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.318
H-Index - 40
eISSN - 1687-8140
pISSN - 1687-8132
DOI - 10.1177/1687814015573829
Subject(s) - lattice boltzmann methods , reynolds number , reynolds stress equation model , mechanics , large eddy simulation , physics , reynolds equation , statistical physics , hele shaw flow , reynolds stress , drag equation , classical mechanics , lift (data mining) , computer science , turbulence , k epsilon turbulence model , drag divergence mach number , k omega turbulence model , data mining
Lattice Boltzmann method combined with large eddy simulation is developed in the article to simulate fluid flow at high Reynolds numbers. A subgrid model is used as a large eddy simulation model in the numerical simulation for high Reynolds flow. The idea of subgrid model is based on an assumption to include the physical effects that the unresolved motion has on the resolved fluid motion. It takes a simple form of eddy viscosity models for the Reynolds stress. Lift and drag evaluation in the lattice Boltzmann equation takes momentum-exchange method for curved body surface. First of all, the present numerical method is validated at low Reynolds numbers. Second, the developed lattice Boltzmann method/large eddy simulation method is performed to solve flow problems at high Reynolds numbers. Some detailed quantitative comparisons are implemented to show the effectiveness of the present method. It is demonstrated that lattice Boltzmann method combined with large eddy simulation model can efficiently simulate high Reynolds numbers’ flows