Features of a reattaching turbulent shear layer in divergent channelflow

Driver, David M.; Seegmiller, H. L.

doi:10.2514/3.8890

Cited by 555 publications

(260 citation statements)

References 9 publications

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“…There are many experimental data (Armaly et al, 1983;Driver and Seegmiller, 1985;Durst and Schmitt, 1985) and numerical simulations (Barton, 1994 Fig. 8 gives the schematic view of the experiment.…”

Section: Flow Over Backward Facing Stepmentioning

confidence: 99%

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Reduction of Numerical Diffusion in FFD Model

Jin

Chen

2012

Engineering Applications of Computational Fluid Mechanics

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Fast flow simulations are needed for some applications in building industry, such as the conceptual design of indoor environment or teaching of Heating Ventilation and Air Conditioning (HVAC) system design in classroom. Instead of pursuing high accuracy, those applications require only conceptual distributions of the flow but within a short computing time. To meet these special needs, a Fast Fluid Dynamics (FFD) method was proposed to provide fast airflow simulation with some compromise in accuracy. This study is to further improve the FFD method by reducing the numerical viscosity that is caused by a linear interpolation in its semi-Lagrangian solver. We propose a hybrid scheme of a linear and a third-order interpolation to reduce the numerical diffusion in low order scheme and the numerical dispersion in high order scheme. The FFD model with both linear and hybrid interpolations are evaluated by simulating four different indoor flows. The results show that the hybrid interpolation can significantly improve the accuracy of the FFD model with a small amount of extra computing time.

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Section: Flow Over Backward Facing Stepmentioning

confidence: 99%

“…We also assume that the grid is uniform and the particle cannot move more than one cell in each time step t: (11) where x i+1 and x i are the coordinates of grid points i+1 and i respectively. C is the CFL number (Courant et al, 1928).…”

Section: Analysis Of Numericical Diffusion In Ffd Modelmentioning

confidence: 99%

Reduction of Numerical Diffusion in FFD Model

Jin

Chen

2012

Engineering Applications of Computational Fluid Mechanics

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“…2) However, the reverse flow (recirculating) region upstream from the reattachment point is governed by the nonequilibrium behavior of turbulence; 5) i.e., the turbulent energy production and the dissipation do not balance. Another feature is that the separated shear layer exhibits unsteadiness because of the vortical structure 2) formed at the step.…”

mentioning

confidence: 99%

“…4) Turbulent energy balance is a methodology that can assist in understanding the turbulent flow structure of the backward-facing step. 3,5,8,9) The turbulent energy production term and the dissipation term are dominant inside the separated shear layer.…”

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confidence: 99%

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Behavior of Separated and Reattaching Flow Formed over a Backward Facing Step.

Rinoie

Shirai

Sunada

2002

Trans. Japan Soc. Aero. S Sci.

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Wind tunnel measurements were done for the separated and reattaching flow formed over a backward-facing step. Turbulent energy and turbulent normal stress balances were estimated from the measured data of mean velocities, Reynolds stresses, and turbulent triple products. The main objective of the experiments is to analyze the turbulent structure inside the reattaching shear layer, including the reverse flow, in detail. The results indicated different turbulent structures in three classified regions of the backward-facing step flow, first the dead air region, second the near wall region just upstream and downstream of the reattachment, and third the separated shear layer region. The second region is the one in which the transverse diffusion by turbulence in the turbulent energy balance equation plays an important role in comparison with other regions. In the reverse flow region just upstream of the reattachment included in the second region, the production term by shear stress, the transverse diffusion term by turbulence, and the advection term similarly help to balance the dissipation term.

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Calculation of Wall-Bounded Complex Flows and Free Shear Flows

Shih

Zhu

Lumley

1996

Int. J. Numer. Meth. Fluids

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Various wall‐bounded flows with complex geometries and free shear flows have been studied with a newly developed realizable Reynolds stress algebraic equation model. The model development is based on the invariant theory in continuum mechanics. This theory enables us to formulate a general constitutive relation for the Reynolds stresses. Pope (J. Fluid Mech., 72, 331–340 (1975)) was the first to introduce this kind of constitutive relation to turbulence modelling. In our study, realizability is imposed on the truncated constitutive relation to determine the coefficients so that, unlike the standard k–ϵ eddy viscosity model, the present model will not produce negative normal stresses in any situations of rapid distortion. The calculations based on the present model have shown encouraging success in modelling complex turbulent flows.

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Features of a reattaching turbulent shear layer in divergent channelflow

Cited by 555 publications

References 9 publications

Reduction of Numerical Diffusion in FFD Model

Reduction of Numerical Diffusion in FFD Model

Behavior of Separated and Reattaching Flow Formed over a Backward Facing Step.

Calculation of Wall-Bounded Complex Flows and Free Shear Flows

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