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http://dx.doi.org/10.3795/KSME-B.2013.37.6.591

Numerical Study of Non-Newtonian Flow Characteristics in Sudden Contraction-Expansion Channel  

Kim, Hyung Min (Dept. of Mechanical System Engineering, Kyonggi Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.6, 2013 , pp. 591-597 More about this Journal
Abstract
Because most existing non-Newtonian models are not suitable for application to the lattice Boltzmann method, theoretical and numerical studies in this regard remain challenging. In this study, the hydrokinetic (HK) model was modified and applied to a 3D sudden contraction-expansion channel flow, and the characteristics of the HK model flow were evaluated to generate non-trivial predictions in three-dimensional strong shear flows. The HK model is very efficient for application to the lattice Boltzmann method because it utilizes the shear rate and relaxation time. However, the simulation would be unstable in a high shear flow field because the local relaxation time sharply decreases with an increase in the shear rate in a strong shear flow field. In the HK model, it may become necessary to truncate the relaxation time and non-dimensional parameter to obtain stable numerical results.
Keywords
Lattice Boltzmann Method; Sudden Contraction; Non-Newtonian Fluid; Hydro-Kinetic Model;
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