Sensitivity of an asymmetric, three-dimensional diffuser to inlet condition perturbations

Sayles, Emily L.; Eaton, John K.

doi:10.1016/j.ijheatfluidflow.2014.04.008

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…Certain separated flows exhibit geometric sensitivity, such that a slight change to the geometry results in a major change to the flow structure. One example of a geometrically sensitive flow is a diffuser with flow separation (Cherry, Elkins & Eaton 2008;Sayles & Eaton 2014). Changing the expansion angle by very small amounts can move the separation location upstream or downstream and dramatically change the characteristics of the flow.…”

mentioning

confidence: 99%

Large-eddy simulation study of unsteady wake dynamics and geometric sensitivity on a skewed bump

Ching

Eaton

2019

J. Fluid Mech.

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confidence: 99%

Large-eddy simulation study of unsteady wake dynamics and geometric sensitivity on a skewed bump

Ching

Eaton

2019

J. Fluid Mech.

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“…Research performed in this field, previously specified, can be divided into purely experimental, theoretical and those in which there are experimental and theoretical results combined. Results obtained after performing experimental studies of vaneless diffusers are published in [6], [7], [8] and [9].…”

Section: Introductionmentioning

confidence: 99%

Methods for increasing the energy efficiency of fan systems using wide-angle plane diffusers with splitter vanes

Klimentov,

Popov,

Kostov

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Fan systems used to transport fluids are widely used and have become a major consumer of electrical energy worldwide. A significant part of the available energy of transported air in HVAC systems has usually been lost (in the form of dynamic pressure) at the system outlet. It is well-known that using outlet diffusers leads to this energy loss be reduced. In some cases, it is necessary to use shortened wide-angle diffusers, which have a higher coefficient of minor energy loss (local resistance). In the present work, a numerical study of the possibilities of increasing the energy efficiency of wide-angle plane diffusers, using splitter vanes, is accomplished. Diffusers with expansion angles of 30, 45 and 60 deg studied. The results obtained indicate the impact of the number of splitter vanes on the minor energy (local resistance) loss coefficient of the studied diffusers.

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“…In an experimental setup of the diffuser, the first challenge is achieving spanwise homogeneity of turbulence due to the presence of sidewalls producing strong backflow. The point of separation and the extent of the flow reversal zone in diffusers are particularly sensitive to the inlet condition [1]. In a numerical simulation of the diffuser, the presence of an adverse pressure gradient and the formation of an unsteady separation bubble make this flow very sensitive and difficult to predict with numerical means.…”

Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulation of an Asymmetric Plane Diffuser: Comparison of Different Subgrid Scale Models

Tang

Lei

et al. 2019

Symmetry

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Large-eddy simulation (LES) of separated turbulent flow through an asymmetric plane diffuser is investigated. The outcome of an actual LES depends on the quality of the subgrid-scale (SGS) model, as well as the accuracy of the numerical method used to solve the equations for the resolved scales. In this paper, we focus on the influence of SGS models for LES of the diffuser flow through using a high-order finite difference method to solve the equations for the resolved scales. Six resolutions are computed to investigate the influence of mesh resolution. Four existing SGS models, a new one-equation dynamic SGS model and a direct numerical simulation (DNS) are conducted in the diffuser flow. A series of computational analyses is performed to assess the performance of different SGS models on the coarse grids. By comparison with the experiment and DNS, the results produced by the new one-equation dynamic model give better agreement with experiment and DNS than the four other existing SGS models.

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Sensitivity of an asymmetric, three-dimensional diffuser to inlet condition perturbations

Cited by 6 publications

References 7 publications

Large-eddy simulation study of unsteady wake dynamics and geometric sensitivity on a skewed bump

Large-eddy simulation study of unsteady wake dynamics and geometric sensitivity on a skewed bump

Methods for increasing the energy efficiency of fan systems using wide-angle plane diffusers with splitter vanes

Large-Eddy Simulation of an Asymmetric Plane Diffuser: Comparison of Different Subgrid Scale Models

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