Large-eddy simulation of turbulent non-Newtonian flows: A comparison with state-of-the-art RANS closures

Amani, E.; Ahmadpour, Ali; Aghajari, M.J.

doi:10.1016/j.ijheatfluidflow.2022.109076

Cited by 6 publications

(2 citation statements)

References 45 publications

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“…In engineering practice, turbulent N-S equations are solved using the Reynolds-averaged N-S (RANS) method, a timeaveraging method that converts the time-varying turbulent problem into a time-invariant problem [258]. Instead of calculating the turbulence pulsations on every scale, RANS calculates the average motion to reduce the computational workload [259]. However, the RANS equations are unclosed because they introduce the Reynolds stress formed by turbulent pulsating motion, in addition to the viscous stress.…”

Section: Characterization Of the Microscopic Flow Fieldmentioning

confidence: 99%

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

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Fluid lubricated bearings have been widely adopted for supporting components of high-end equipments in the field of metrology, semi-conductor, aviation, strategic defense, ultra-precision manufacturing, medical treatment and power generations. These fields all involve extreme working conditions such as ultra-high moving precision, ultra-high rotation speed, ultra-heavy bearing load, ultra-high environmental temperature, high radiation and high vacuum, which present challenges for the design and optimization of reliable fluid lubricated bearings. Breakthrough of any related bottlenecks will promote the development course of high-end equipments. To further promote the advancement of high-end equipments, this paper reviews the design and optimization of fluid lubricated bearings operated with typical extreme working performances. Targeting on the realization of extreme working perfor mances, the current challenges, the current solutions, the underlying deficiencies and the promising developing directions regarding to the design and optimization of fluid lubricat ed bearings are systematically pointed out. This paper can provide guidance for choosing suitable fluid lubricated bearings and optimizing their structures based on required extremeworking performances.

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Section: Characterization Of the Microscopic Flow Fieldmentioning

confidence: 99%

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

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“…It should be noted that the level of turbulence anisotropy of a non-Newtonian fluid is higher than that of a Newtonian fluid (Masoudian et al, 2016;Sahu et al, 2007). A few large eddy simulation (LES) (Gnambode et al, 2015;Amani et al, 2023) and direct numerical simulation (DNS) (Gavrilov & Rudyak, 2017;Singh et al, 2017) studies have been carried out to study visco-and pseudo-plastic turbulent fluids in the last two decades. Data were obtained on the mean streamwise velocity, distributions of the components of the Reynolds stress tensor, wall friction, balance of shear stresses, and the turbulent kinetic energy for a steady turbulent flow with Reynolds numbers in the range Re = 5000-20000.…”

Section: Introductionmentioning

confidence: 99%

RANS modeling of the transition of a non-isothermal flow of a Newtonian fluid to a viscoplastic state in a pipe

Maksim,

Uzak

2023

Materials of International Practical Internet Conference “Challenges of Science”

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A mathematical model of the movement and heat transfer of a turbulent non-isothermal non-Newtonian fluid through a pipe wall with a cold surrounding space has been developed and simulated numerically. Fluid turbulence is described in the framework of the isotropic two-parameter k– model. The Newtonian properties of the fluid in the initial cross-sections of the pipe transformed gradually into a viscoplastic non-Newtonian Bingham-Schwedoff fluid state due to heat transfer through the pipe wall between the heated fluid and a cold environment. The value of its streamwise velocity in the axial zone increased significantly when the fluid moved along the pipe. On the contrary, it decreased in the near-wall zone and the height of the region with a zero fluid velocity increased. This occurred due to the viscoplastic properties of a non-Newtonian fluid. The height of the region with a zero fluid velocity in the pipe increased gradually as the non-Newtonian fluid (waxy crude oil) moved through the pipe. A noticeable increase in the level of turbulent kinetic energy in the axial zone of the pipe and its noticeable decrease in its near-wall region were observed. A significant increase in the average dynamic viscosity and yield stress in the near-wall part of the pipe was shown. The boundary of the area of existence of Newtonian properties of fluid was determined. The height of the region with a zero fluid velocity in the pipe increased gradually as waxy crude oil moved through the pipe and reached y/R ≈ 0.1 at x/D = 15.

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Wall-modeled large-eddy simulation of turbulent non-Newtonian power-law fluid flows

Taghvaei,

Amani

2023

Journal of Non-Newtonian Fluid Mechanics

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Large-eddy simulation of turbulent non-Newtonian flows: A comparison with state-of-the-art RANS closures

Cited by 6 publications

References 45 publications

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

RANS modeling of the transition of a non-isothermal flow of a Newtonian fluid to a viscoplastic state in a pipe

Wall-modeled large-eddy simulation of turbulent non-Newtonian power-law fluid flows

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