ILES and LES of Complex Engineering Turbulent Flows

Fureby, Christer

doi:10.1115/1.2801370

Cited by 25 publications

(9 citation statements)

References 59 publications

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“…This is done by any stable numerical scheme (preferably high-order). Using the truncation error as implicit SGS model is referred in the literature as implicit LES (ILES) [35] or Monotonically Integrated LES (MILES) [36]. ILES or MILES interlink the subgrid scale dissipation to the leading term of the truncation error.…”

Section: Subgrid Transport and Combustion Modelingmentioning

confidence: 99%

Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing

Iudiciani

Duwig

2011

Flow Turbulence Combust

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The effect of axial forcing on the flame/vortex breakdown interaction is studied, with particular focus on the Precessing Vortex Core (PVC). Large Eddy Simulation (LES), together with a filtered flamelet model describing the subgrid combustion, is performed to study a lean premixed flame undergoing mass flow fluctuations in a wide range of frequencies and amplitude. In average, forcing at frequencies lower than the PVC characteristic frequency moves the recirculation zone upstream the combustor in the premixing tube, while higher frequencies do not relevantly affect the flow/flame. With the help of Proper Orthogonal Decomposition (POD) a detailed analysis of the dynamics of the central recirculation zone (CRZ) is performed showing how the excitation at lower frequencies weakens the PVC and allows the flame to propagate upstream. Extended POD is also applied to illustrate the flow/flame interactions during the excitation cycle.

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Section: Subgrid Transport and Combustion Modelingmentioning

confidence: 99%

Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing

Iudiciani

Duwig

2011

Flow Turbulence Combust

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“…In ILES, no explicit model is applied for B ij , instead the numerical dissipation is considered enough to mimic the action of B ij [31][32][33]. Therefore, for fully resolved boundary layer mesh, y + ≤ 5, the dissipation of momentum convection scheme is the only source that mimics the turbulent viscosity.…”

Section: Please Cite This Article As Doi:101063/50009622mentioning

confidence: 99%

Investigations of tip vortex mitigation by using roughness

et al. 2020

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The application of artificial roughness to mitigate tip vortex cavitation inception is analyzed through numerical and experimental investigations carried out on an elliptical foil. Different roughness configurations and sizes are tested and effects on cavitation inception, drag, and lift, are studied. Implicit Large Eddy Simulation (ILES) is employed to conduct the simulation on a proper grid resolution having the tip vortex spatial resolution as fine as 0.062 mm. Two different approaches including using a rough wall function and resolving the flow around roughness elements are evaluated. New experiments, performed in the cavitation tunnel at Kongsberg Hydrodynamic Research Centre, for the rough foil are presented.The vortical structures and vorticity magnitude distributions are employed to demonstrate how different roughness patterns and configurations contribute to the vortex roll-up and consequently on the tip vortex strength.It is found that the application of roughness on the leading edge, tip region and trailing edge of the suction side are acceptable to mitigate the tip vortex and also to limit the performance degradation. This is regarded to be in close relation with the way that the tip vortex forms in the studied operating condition. The analysis of boundary layer characteristics shows a separation line caused by roughness is the reason for a more even distribution of vorticity over the tip compared to the smooth foil condition leading to a reduction in vortex strength. For the optimum roughness pattern, both the numerical results and experimental measurements show a decrease in the tip vortex cavitation inception as large as 33 % compared to the smooth foil condition with a drag force increase observed to be less than 2 %.

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“…The filtered Navier-Stokes equations were solved using OpenFOAM R , a library of C++ classes for CFD simulation. OpenFOAM R includes a well-tested and validated LES capability (Fureby et al, 1997a(Fureby et al, ,b, 2000Fureby, 2007;Baba-Ahmadi and Tabor, 2009;Bensow and Bark, 2010;Payri et al, 2010). A finite-volume method was used to discretise the filtered Navier-Stokes equations.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of a steady circular jet issuing into quiescent fluid

Jewkes

King

Chung

2011

Chan, F., Marinova, D. And Anderssen, R.S. (Eds) MODSIM2011, 19th International Congress on Modelling and Simulation.

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In this paper we present preliminary results from a high-resolution large eddy simulation (LES) study which will establish whether jet inlet velocity conditions are of significance in separation control applications. We include orifice geometry, in order to allow realistic turbulent structures to naturally develop. Ultimately, we will simulate various momentum thicknesses, (D/θ = 50, 80, 120 and 180) at Re j = 10 4 where Re j = U j D/ν, where U j is the jet inflow velocity and D is the jet diameter, however this paper presents initial high-resolution LES results for a steady jet, Re j = 10 4 , D/θ = 50. The ≈ 1.2 × 10 7 cell model was computed using the iVEC EPIC supercomputing cluster, and our local Beowulf cluster at Curtin University, (12× Intel i7 920 quad core CPUs (= 48 cores)). Our results show promising agreement with validation data, and indicate that our model has the potential to produce useful and accurate data regarding the evolution of a steady turbulent jet issuing into quiescent air.Centreline slice showing instantaneous vortical structures, vorticity magnitude scaled from 0 (white) to 10 (black).

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ILES and LES of Complex Engineering Turbulent Flows

Abstract: Abstract. The present study concerns the application of Large Eddy Simulation (LES) and Implicit LES (ILES)

Cited by 25 publications

References 59 publications

Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing

Large Eddy Simulation of the Sensitivity of Vortex Breakdown and Flame Stabilisation to Axial Forcing

Investigations of tip vortex mitigation by using roughness

Large eddy simulation of a steady circular jet issuing into quiescent fluid

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