Large eddy simulation in complex geometric configurations using boundary body forces

Verzicco, Roberto; Mohd-Yusof, Jamaludin; Orlandi, P.; Haworth, Daniel T.

doi:10.2514/3.14430

Cited by 54 publications

(75 citation statements)

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“…Both the maximum and the mean show cycle-to-cycle variation in Figure 3. Further results including cycle-to-cycle and azimuthal variability can be found in Haworth and Jansen (1998) and Verzicco et al (1998).…”

Section: A Reciprocating Piston-cylinder Assembly With Fixed Central mentioning

confidence: 88%

“…A quite different computational approach is being pursued by Verzicco et al (1998). Here a structured orthogonal mesh is used.…”

Section: Body-force Methodsmentioning

confidence: 99%

“…Solid lines correspond to a second unstructured boundaryfitted computation with a somewhat finer mesh (258 264 nodes) and the Lagrangian dynamic Smagorinsky model; here five engine cycles have been used in the ensemble averaging (after discarding the first cycle). And the chain-dashed lines are results obtained using the body-force method (Section 3.2; Verzicco et al, 1998), a mesh of about 1.6×10 6 nodes, and an azimuthally averaged dynamic Smagorinsky model; many of the mesh points lie outside of the flow domain.…”

Section: A Reciprocating Piston-cylinder Assembly With Fixed Central mentioning

confidence: 99%

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Large-Eddy Simulation of in-Cylinder Flows

Haworth

1999

Oil & Gas Science and Technology - Rev. IFP

119

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RŽsumŽ Ñ Simulation ˆ grande Žchelle des Žcoulements internes dans les moteurs Ñ Les progr•s des mod•les physiques, des mŽthodes numŽriques et de la puissance de calcul permettent quÕon puisse prendre en considŽration les simulations ˆ grande Žchelle (LES) pour le calcul des Žcoulements turbulents dans les moteurs. La synth•se prŽsentŽe comprend : une discussion sur la LES montrant ses diffŽrences avec la modŽlisation aux moyennes de Reynolds (RANS) ; les motivations pour passer ˆ la LES pour les Žcoulements internes aux moteurs ; des rŽsultats quantitatifs pour deux configurations de moteur entra"nŽ. Des mod•les de sous-maille Ç dynamique È des tenseurs sont dŽveloppŽs, par ailleurs, nous discutons des rŽsultats donnŽs par deux approches numŽriques diffŽrentes. En comparaison avec la mŽthodologie RANS, la LES requiert peu dÕapports empiriques, donne plus de dŽtails sur la structure de lÕŽcoulement dans le cylindre et permet lÕanalyse de phŽno-m•nes jusquÕalors inaccessibles, comme les variations cycliques. Mots-clŽs : simulation, LES, moteurs. Abstract Ñ Large-Eddy Simulation of In-Cylinder Flows Ñ Advances in physical models, numerical methods, and computational power together have brought large-eddy simulation (LES) to the point where it warrants serious consideration for computing in-cylinder turbulent flows. This article includes: a discussion of LES and how it differs from Reynolds-averaged Navier Stokes (RANS) modeling

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Section: A Reciprocating Piston-cylinder Assembly With Fixed Central mentioning

confidence: 88%

“…A quite different computational approach is being pursued by Verzicco et al (1998). Here a structured orthogonal mesh is used.…”

Section: Body-force Methodsmentioning

confidence: 99%

Section: A Reciprocating Piston-cylinder Assembly With Fixed Central mentioning

confidence: 99%

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Large-Eddy Simulation of in-Cylinder Flows

Haworth

1999

Oil & Gas Science and Technology - Rev. IFP

119

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“…This suggests a technique for determining the wall stress. It would be inappropriate to define a force to make the velocity zero at the boundary as in embedded boundary numerical methods 40,41 , since the filtered velocity is not zero at the wall. Instead, we choose σ wall to minimize the transport of momentum to the exterior domain.…”

Section: Filtered Wall Formulationmentioning

confidence: 99%

Development and Implementation of Practical Optimal LES Models

Moser¹,

Adrian²

2007

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Motivation and ObjectivesOne of the most promising techniques for the prediction of turbulent flows is that of Large Eddy Simulation (LES), in which an under-resolved representation of the turbulence is simulated numerically by modeling the effects of the unresolved small-scales on the simulation. Such simulations have been applied in several flows with reasonable success. However, there are several outstanding problems that need to be addressed before LES can fulfill its promise as a tool for turbulence prediction in engineering flows. The most serious problems limiting the usefulness of LES is the representation of turbulence near walls and other strong inhomogeneities and the dependence of models on the filter and/or numerical discretization.The optimal LES formulation 1,2 provides a rigorous framework in which to address these issues and to develop and analyze LES models and simulations. Optimal LES modeling has been found to produce accurate LES simulations when based on reliable statistical information, so the primary thrust of the current research is to reduce or eliminate the need for empirical statistical input through theory and modeling of turbulence statistics. When small-scale isotropy is a valid assumption, the Kolmogorov theory and isotropy are can provide much information. However, when inhomogeneity and anisotropy are strong, or the Reynolds number is not too large, more information will be required, and models for this are being developed, particularly for near-wall turbulence.Theoretical models for the turbulence multi-point correlations allow optimal LES models to be implemented relatively simply in production CFD codes, and preliminary implementations in FDL3DI at AFRL have been pursued.

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“…However, the direct forcing approach remains most popular due to its simplicity and enhanced stability compared to other immersed boundary methods. Many variants of direct forcing methods have therefore appeared in the literature [6,7,8,9,10,11,12,13] and have been implemented in the framework of the fractional step algorithm which is commonly employed for solving the Navier-Stokes equations [7,8,9,14].…”

Section: Introductionmentioning

confidence: 99%

A robust direct-forcing immersed boundary method with enhanced stability for moving body problems in curvilinear coordinates

2015

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A robust immersed boundary method for semi-implicit discretizations of the Navier-Stokes equations on curvilinear grids is presented. No-slip conditions are enforced via momentum forcing, and mass conservation at the immersed boundary is satisfied via a mass source term developed for moving bodies. The errors associated with an explicit evaluation of the momentum forcing are analysed, and their influence on the stability of the underlying Navier-Stokes solver is examined. An iterative approach to compute the forcing term implicitly is proposed, which reduces the errors at the boundary and retains the stability guarantees of the original semi-implicit discretization of the Navier-Stokes equations. The implementation in generalized curvilinear coordinates and the treatment of moving boundaries are presented, followed by a number of test cases. The tests include stationary and moving boundaries and curvilinear grid problems (decaying vortex problem, stationary cylinder, flow in 90• bend in circular duct and oscillating cylinder in fluid at rest).

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Large eddy simulation in complex geometric configurations using boundary body forces

Cited by 54 publications

References 0 publications

Large-Eddy Simulation of in-Cylinder Flows

Large-Eddy Simulation of in-Cylinder Flows

Development and Implementation of Practical Optimal LES Models

A robust direct-forcing immersed boundary method with enhanced stability for moving body problems in curvilinear coordinates

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