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Open AccessArticle

Assessment of Solution Algorithms for LES of Turbulent Flows Using OpenFOAM

1
Dipartimento di Ingegneria e Architettura, Università di Trieste, Via Valerio 6, 34127 Trieste, Italy
2
IE-FLUIDS S.r.l, 34127 Trieste, Italy
*
Authors to whom correspondence should be addressed.
Current address: Flanders Hydraulics Research, Berchemlei 115, 2140 Antwerpen-Borgerhout, Belgium.
Fluids 2019, 4(3), 171; https://doi.org/10.3390/fluids4030171
Received: 26 June 2019 / Revised: 26 August 2019 / Accepted: 8 September 2019 / Published: 12 September 2019
(This article belongs to the Special Issue Multiscale Turbulent Transport)
We validate and test two algorithms for the time integration of the Boussinesq form of the Navier—Stokes equations within the Large Eddy Simulation (LES) methodology for turbulent flows. The algorithms are implemented in the OpenFOAM framework. From one side, we have implemented an energy-conserving incremental-pressure Runge–Kutta (RK4) projection method for the solution of the Navier–Stokes equations together with a dynamic Lagrangian mixed model for momentum and scalar subgrid-scale (SGS) fluxes; from the other side we revisit the PISO algorithm present in OpenFOAM (pisoFoam) in conjunction with the dynamic eddy-viscosity model for SGS momentum fluxes and a Reynolds Analogy for the scalar SGS fluxes, and used for the study of turbulent channel flows and buoyancy-driven flows. In both cases the validity of the anisotropic filter function, suited for non-homogeneous hexahedral meshes, has been studied and proven to be useful for industrial LES. Preliminary tests on energy-conservation properties of the algorithms studied (without the inclusion of the subgrid-scale models) show the superiority of RK4 over pisoFoam, which exhibits dissipative features. We carried out additional tests for wall-bounded channel flow and for Rayleigh–Bènard convection in the turbulent regime, by running LES using both algorithms. Results show the RK4 algorithm together with the dynamic Lagrangian mixed model gives better results in the cases analyzed for both first- and second-order statistics. On the other hand, the dissipative features of pisoFoam detected in the previous tests reflect in a less accurate evaluation of the statistics of the turbulent field, although the presence of the subgrid-scale model improves the quality of the results compared to a correspondent coarse direct numerical simulation. In case of Rayleigh–Bénard convection, the results of pisoFoam improve with increasing values of Rayleigh number, and this may be attributed to the Reynolds Analogy used for the subgrid-scale temperature fluxes. Finally, we point out that the present analysis holds for hexahedral meshes. More research is need for extension of the methods proposed to general unstructured grids. View Full-Text
Keywords: OpenFOAM; Runge–Kutta (RK4); PISO; wall-resolved Large Eddy Simulation (LES); Rayleigh–Bènard convection; channel flow OpenFOAM; Runge–Kutta (RK4); PISO; wall-resolved Large Eddy Simulation (LES); Rayleigh–Bènard convection; channel flow
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MDPI and ACS Style

López Castaño, S.; Petronio, A.; Petris, G.; Armenio, V. Assessment of Solution Algorithms for LES of Turbulent Flows Using OpenFOAM. Fluids 2019, 4, 171.

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