A New Relaxation Time Model for Lattice Boltzmann Simulation of Nano Couette Flows in Wide Range of Flow Regimes

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GHATREH SAMANI S.; Meghdadi Isfahani a.h.

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Journal Paper

Paper Information

Journal: JOURNAL OF APPLIED FLUID MECHANICS (JAFM) Year:2019 | Volume:12 | Issue:6 Page(s): 1781-1790

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Information Journal Paper

Title

A New Relaxation Time Model for Lattice Boltzmann Simulation of Nano Couette Flows in Wide Range of Flow Regimes

Author(s)

GHATREH SAMANI S. | Meghdadi Isfahani a.h. | Issue Writer Certificate

Keywords

Lattice Boltzmann method

Micro and nano-Couette

Transitional regime

Knudsen number

Relaxation time

Rarefaction

Abstract

The standard LBM with the Relaxation time is only able to simulate the flow features in continuum and slip regimes. In the present paper, a new Relaxation time formulation considering the Rarefaction effect on the viscosity for the lattice Boltzmann simulation of shear driven flows is presented in order to cover wide range of the flow regimes. The results show that in spite of the standard Lattice Boltzmann method, LBM, the presented Relaxation time equation is able to predict flow features in wide range of flow regimes including slip, transition and to some extend free molecular flow regimes. The velocity profiles, slip length and shear stress agree very well with DSMC (Direct Simulation Monte Carlo) and linear Boltzmann results.

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APA: Copy

GHATREH SAMANI, S., & Meghdadi Isfahani, a.h.. (2019). A New Relaxation Time Model for Lattice Boltzmann Simulation of Nano Couette Flows in Wide Range of Flow Regimes. JOURNAL OF APPLIED FLUID MECHANICS (JAFM), 12(6), 1781-1790. SID. https://sid.ir/paper/308334/en

Vancouver: Copy

GHATREH SAMANI S., Meghdadi Isfahani a.h.. A New Relaxation Time Model for Lattice Boltzmann Simulation of Nano Couette Flows in Wide Range of Flow Regimes. JOURNAL OF APPLIED FLUID MECHANICS (JAFM)[Internet]. 2019;12(6):1781-1790. Available from: https://sid.ir/paper/308334/en

IEEE: Copy

S. GHATREH SAMANI, and a.h. Meghdadi Isfahani, “A New Relaxation Time Model for Lattice Boltzmann Simulation of Nano Couette Flows in Wide Range of Flow Regimes,” JOURNAL OF APPLIED FLUID MECHANICS (JAFM), vol. 12, no. 6, pp. 1781–1790, 2019, [Online]. Available: https://sid.ir/paper/308334/en

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