Physics of Fluids

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Simplified and highly stable thermal Lattice Boltzmann method simulation of hybrid nanofluid thermal convection at high Rayleigh numbers
Physics of Fluids - Tập 32 Số 1 - 2020
Yuan Ma, Jing Wang
A new method called simplified and highly stable thermal lattice Boltzmann method, which is based on the lattice Boltzmann framework, was used to simulate the hybrid nanofluid natural convection and heat transfer in a square enclosure with a heating obstacle at high Rayleigh numbers. Four fins protrude from the heating obstacle to affect the flow pattern and heat transfer performance. The ...... hiện toàn bộ
Numerical investigation of magnetic multiphase flows by the fractional-step-based multiphase lattice Boltzmann method
Physics of Fluids - Tập 32 Số 8 - 2020
Xiang Li, Zhi-Qiang Dong, Peng Yu, Xiaodong Niu, Lian‐Ping Wang, Decai Li, Hiroshi Yamaguchi
In the present study, a fractional-step-based multiphase lattice Boltzmann (LB) method coupled with a solution of a magnetic field evolution is developed to predict the interface behavior in magnetic multiphase flows. The incompressible Navier–Stokes equations are utilized for the flow field, while the Cahn–Hilliard equation is adopted to track the interface, and these governing equations ...... hiện toàn bộ
A consistent hydrodynamic boundary condition for the lattice Boltzmann method
Physics of Fluids - Tập 7 Số 1 - Trang 203-209 - 1995
David R. Noble, Shiyi Chen, John G. Georgiadis, Richard O. Buckius
A hydrodynamic boundary condition is developed to replace the heuristic bounce-back boundary condition used in the majority of lattice Boltzmann simulations. This boundary condition is applied to the two-dimensional, steady flow of an incompressible fluid between two parallel plates. Poiseuille flow with stationary plates, and a constant pressure gradient is simulated to machine accuracy o...... hiện toàn bộ
Lattice Boltzmann methods for modeling microscale flow in fibrous porous media
Physics of Fluids - Tập 9 Số 9 - Trang 2468-2474 - 1997
Michael Spaid, Frederick R. Phelan
A lattice Boltzmann description of fluid flow in heterogeneous porous media is presented which is intended for modeling flow processes which occur in liquid composite molding applications. The lattice Boltzmann method is equivalent to solving a hybrid method of the Stokes and Brinkman equations, with the Brinkman equation being implemented to model flow through porous structures, while the...... hiện toàn bộ
Characterization of the secondary flow in hexagonal ducts
Physics of Fluids - Tập 28 Số 12 - 2016
Oana Marin, Ricardo Vinuesa, Aleksandr Obabko, Philipp Schlatter
In this work we report the results of DNSs and LESs of the turbulent flow through hexagonal ducts at friction Reynolds numbers based on centerplane wall shear and duct half-height Reτ,c ≃ 180, 360, and 550. The evolution of the Fanning friction factor f with Re is in very good agreement with experimental measurements. A significant disagreement between the DNS and previous RANS simulations...... hiện toàn bộ
The subgrid-scale estimation model in the physical space representation
Physics of Fluids - Tập 11 Số 8 - Trang 2330-2342 - 1999
J. Andrzej Domaradzki, Kuo-Chieh Loh
The subgrid-scale estimation procedure for large eddy simulations developed previously in the spectral (Fourier) representation is extended to the physical space representation. The procedure provides an estimate of the unfiltered velocity field appearing in the definition of the subgridscale stress tensor and consists of two steps. In the deconvolution step an approximate inversion of the...... hiện toàn bộ
A dynamic subgrid-scale eddy viscosity model with a global model coefficient
Physics of Fluids - Tập 18 Số 12 - 2006
Noma Park, Sungwon Lee, Jungil Lee, Haecheon Choi
In the present study, a dynamic subgrid-scale eddy viscosity model is proposed for large eddy simulation of turbulent flows in complex geometry. A subgrid-scale eddy viscosity model recently proposed by Vreman [Phys. Fluids 16, 3670 (2004)] which guarantees theoretically zero subgrid-scale dissipation for various laminar shear flows, is considered as a base model. A priori tests with the o...... hiện toàn bộ
Toward improved consistency of a priori tests with a posteriori tests in large eddy simulation
Physics of Fluids - Tập 17 Số 1 - 2005
Noma Park, Jung Yul Yoo, Haecheon Choi
It is well known that conventional a priori tests based on the instantaneous true subgrid scale (SGS) stress do not provide a useful diagnostic information on deterministic SGS models due to the stochastic nature of unresolved scales. In this study, the possibility of an alternative diagnostics based on the “best deterministic” model is investigated. The optimal SGS model [J. A. Langford a...... hiện toàn bộ
Influences of serrated trailing edge on the aerodynamic and aeroacoustic performance of a flapping wing during hovering flight
Physics of Fluids - Tập 34 Số 1 - 2022
Xueyu Ji, Li Wang, Sridhar Ravi, Fang-Bao Tian, John Young, Joseph C. S. Lai
The influences of serrated trailing edge on the aerodynamic and aeroacoustic performance of a flapping wing during hovering flight are investigated using a hybrid framework of an immersed boundary Navier–Stokes solver for the flow field and the Ffowcs Williams–Hawkings (FW–H) analogy for the sound field. A rigid rectangular wing with an aspect ratio of 2 undergoes pitching and stroke motio...... hiện toàn bộ
Effect of the rotor blade installation angle on the structure-borne noise generated by adjustable-blade axial-flow fans
Physics of Fluids - Tập 33 Số 9 - 2021
Liting Sun, Chunguo An, Nini Wang, Chuntian Zhe, Lin Wang, Suoying He, Ming Gao
The effect of rotor blade installation angle on the structure-borne noise of adjustable-blade axial-flow fans is analyzed based on the fluid–solid coupling method. The co-simulation environment ANSYS Workbench is adopted to perform one-way fluid–solid coupling analysis. Following this, the properties of the flow field and noise field with different installation angles are simulated. The fl...... hiện toàn bộ
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