Flow past a single stationary sphere, 2. Regime mapping and effect of external disturbances

Tiwari, Sudarshan; Pal, Eshita; Bale, Shivkumar; Minocha, Nitin; Patwardhan, Ashwin W.; Nandakumar, K.; Joshi, Jyeshtharaj B.

doi:10.1016/j.powtec.2019.04.032

Cited by 43 publications

(16 citation statements)

References 181 publications

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“…The flow over a sphere has been extensively studied, and a comprehensive review is provided by Tiwari et al. (2020). Three Reynolds numbers are considered here, , and , corresponding to the first three wake modes: the axisymmetric regime (), the steady planar symmetric mode () and the symmetric vortex shedding regime ().…”

Section: Example Flowsmentioning

confidence: 99%

The generation and diffusion of vorticity in three-dimensional flows: Lyman's flux

2021

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Section: Example Flowsmentioning

confidence: 99%

The generation and diffusion of vorticity in three-dimensional flows: Lyman's flux

2021

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“…The standard k−ε model is a two-equation, semiempirical, eddy viscosity-based Reynolds Average Navier–Stokes (RANS) model, derived using phenomenological considerations and pragmatism. It is the most commonly used turbulence model which has been successfully used to simulate a wide variety of flows ranging from some fundamental flow configurations to multiscale industrial flows. − The standard k−ε model gives considerably accurate results in a time-averaged sense. − Moreover, along with reasonable accuracy, the k−ε model is also robust, computationally less intensive and numerically stable as compared to higher-order turbulence models. , As per the physics of turbulence involved in cook stoves and by previously reported studies, it can be concluded that the standard k−ε model would be appropriate for serving our purpose of optimizing the hydrodynamic parameters of BCS.…”

Section: Mathematical Modelsmentioning

confidence: 92%

Computational Fluid Dynamics Study of Biomass Cook Stove—Part 1: Hydrodynamics and Homogeneous Combustion

Husain

Tiwari

Pandit

et al. 2019

Ind. Eng. Chem. Res.

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In this work, a computational fluid dynamics (CFD)-assisted optimization study has been carried out, implementing geometric design modifications in a biomass cook stove (BCS) to achieve uniform air–fuel distribution. The work has been divided into two parts. The first part deals with the numerical investigations of fluid phase hydrodynamics and air–fuel homogeneous phase combustion. Simulations have been performed for a wide range of air velocities to predict the roles of primary and secondary airflow in improving the spatial airflow uniformity inside the BCS. The homogeneous combustion simulations show linear dependence of power and temperature on the air velocity and air-to-fuel ratio. The results indicate that the most optimized power output and temperature values are achieved when the grate is placed at a height of 25 mm, and the orifice plate with 15 holes of 10 mm each is located at a height of 105 mm from the bottom of the cook stove.

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“…[19][20][21] Numerical models help decipher the hydrodynamic behaviour of the reactor and get a detailed description of the underlying physics of the different phases involved; this further aids in establishing better equipment design, scale-up procedures, and operability. [22,23] Computational fluid dynamics (CFD) is a numerical model that utilizes the Navier-Stokes equations to simulate the fluid flow in different multiphase reactors. CFD has been extensively used to model gassolid multiphase flows to develop the design and scaleup procedures for industrial-scale reactors and from a fundamental perspective.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamic simulations of regular bubble patterns in pulsed fluidized beds using a two‐fluid model

et al. 2021

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This simulation study explores the two-fluid model's (TFM) capability to reproduce the alternating bubble patterns in a sinusoidal pulsed fluidized bed (PFB). Simulations were performed with frictional limits ranging between 0.58-0.62 with the inlet gas frequency being varied in the range of 3-6 Hz. The preliminary investigations showed that the Johnson and Jackson frictional model with a frictional limit of 0.61 yields a regular bubble pattern. The inference of this regular bubble pattern was based on the discrete Fourier analysis of the temporal pressure signals obtained at different spatial locations inside the PFB. Although the one-dimensional temporal pressure signals character-Zhizhong Ding and Shashank S. Tiwari have contributed equally.

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Flow past a single stationary sphere, 2. Regime mapping and effect of external disturbances

Cited by 43 publications

References 181 publications

The generation and diffusion of vorticity in three-dimensional flows: Lyman's flux

The generation and diffusion of vorticity in three-dimensional flows: Lyman's flux

Computational Fluid Dynamics Study of Biomass Cook Stove—Part 1: Hydrodynamics and Homogeneous Combustion

Computational fluid dynamic simulations of regular bubble patterns in pulsed fluidized beds using a two‐fluid model

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