An investigation of interface-sharpening schemes for multi-phase mixture flows

Cassidy, Daniel; Edwards, Jack R.; Tian, Ming

doi:10.1016/j.jcp.2009.02.028

Cited by 74 publications

(61 citation statements)

References 35 publications

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“…An implicit, dual time-stepping artificial compressibility method is used for time advancement, with sub-iterations performed each physical time-step to adjust the flow to the new position of the body and to converge the continuity equation. Spatial discretization of the inviscid fluxes uses a low-diffusion flux-splitting method valid in the incompressible limit [10]. The Spalart-Allmaras model [66], as implemented by Edwards and Chandra [18], is used for turbulence closure.…”

Section: Computational and Experimental Methodsmentioning

confidence: 99%

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Leading-edge flow criticality as a governing factor in leading-edge vortex initiation in unsteady airfoil flows

Ramesh

Granlund

et al. 2017

Theor. Comput. Fluid Dyn.

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A leading-edge suction parameter (LESP) that is derived from potential flow theory as a measure of suction at the airfoil leading edge is used to study initiation of leading-edge vortex (LEV) formation in this article. The LESP hypothesis is presented, which states that LEV formation in unsteady flows for specified airfoil shape and Reynolds number occurs at a critical constant value of LESP, regardless of motion kinematics. This hypothesis is tested and validated against a large set of data from CFD and experimental studies of flows with LEV formation. The hypothesis is seen to hold except in cases with slow-rate kinematics which evince significant trailing-edge separation (which refers here to separation leading to reversed flow on the aft portion of the upper surface), thereby establishing the envelope of validity. The implication is that the critical LESP value for an airfoil-Reynolds number combination may be calibrated using CFD or experiment for just one motion and then employed to predict LEV initiation for any other (fast-rate) motion. It is also shown that the LESP concept may be used in an inverse mode to generate motion kinematics that would either prevent LEV formation or trigger the same as per aerodynamic requirements.

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Section: Computational and Experimental Methodsmentioning

confidence: 99%

“…The computations were performed on a 2-D body-fitted mesh containing 92,400 cells. REACTMB-INS has been used for a wide variety of CFD problems, including unsteady aerodynamics [52,57], two-phase flows [10], human-induced contaminant transport [12,13], and moving-body flows [14].…”

Section: Computational and Experimental Methodsmentioning

confidence: 99%

Leading-edge flow criticality as a governing factor in leading-edge vortex initiation in unsteady airfoil flows

Ramesh

Granlund

et al. 2017

Theor. Comput. Fluid Dyn.

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“…Spatial discretization of the inviscid fluxes uses a low-diffusion flux-splitting method valid in the incompressible limit. 35 The Spalart-Allmaras model 36 as implemented by Edwards and Chandra, 37 is used for turbulence closure. The computations were performed on a 2-D body-fitted mesh containing 92, 400 cells and an SD7003 airfoil is used for all motion kinematics.…”

Section: Iiia Use Of Cfd For Calibration and Verificationmentioning

confidence: 99%

Theoretical Analysis of Perching and Hovering Maneuvers

Ramesh

Gopalarathnam

Edwards

et al. 2013

31st AIAA Applied Aerodynamics Conference

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“…Hence, our proposed correction algorithm does not interfere with the conservation of total mass or volume on the fluid grid. While our correction algorithm is novel in the field of PU-EL simulation models, one may compare it with "interface-sharpening" algorithms [25,26]. The latter are frequently used in the so-called volume of fluid (VoF) method for modeling two phase flows of incompressible fluids and similar in spirit to our algorithm.…”

Section: Goalsmentioning

confidence: 99%

Voidage correction algorithm for unresolved Euler–Lagrange simulations

2018

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The effect of grid coarsening on the predicted total drag force and heat exchange rate in dense gas-particle flows is investigated using Euler-Lagrange (EL) approach. We demonstrate that grid coarsening may reduce the predicted total drag force and exchange rate. Surprisingly, exchange coefficients predicted by the EL approach deviate more significantly from the exact value compared to results of Euler-Euler (EE)-based calculations. The voidage gradient is identified as the root cause of this peculiar behavior. Consequently, we propose a correction algorithm based on a sigmoidal function to predict the voidage experienced by individual particles. Our correction algorithm can significantly improve the prediction of exchange coefficients in EL models, which is tested for simulations involving Euler grid cell sizes between 2d p and 12d p . It is most relevant in simulations of dense polydisperse particle suspensions featuring steep voidage profiles. For these suspensions, classical approaches may result in an error of the total exchange rate of up to 30%.

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An investigation of interface-sharpening schemes for multi-phase mixture flows

Cited by 74 publications

References 35 publications

Leading-edge flow criticality as a governing factor in leading-edge vortex initiation in unsteady airfoil flows

Leading-edge flow criticality as a governing factor in leading-edge vortex initiation in unsteady airfoil flows

Theoretical Analysis of Perching and Hovering Maneuvers

Voidage correction algorithm for unresolved Euler–Lagrange simulations

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