Flow, Turbulence and Combustion

, Volume 99, Issue 1, pp 93–118 | Cite as

A Mesh Adaptation Strategy to Predict Pressure Losses in LES of Swirled Flows

  • Guillaume Daviller
  • Maxence Brebion
  • Pradip Xavier
  • Gabriel Staffelbach
  • Jens-Dominik Müller
  • Thierry Poinsot
Article

Abstract

Large-Eddy Simulation (LES) has become a potent tool to investigate instabilities in swirl flows even for complex, industrial geometries. However, the accurate prediction of pressure losses on these complex flows remains difficult. The paper identifies localised near-wall resolution issues as an important factor to improve accuracy and proposes a solution with an adaptive mesh h-refinement strategy relying on the tetrahedral fully automatic MMG3D library of Dapogny et al. (J. Comput. Phys. 262, 358-378, 2014) using a novel sensor based on the dissipation of kinetic energy. Using a joint experimental and numerical LES study, the methodology is first validated on a simple diaphragm flow before to be applied on a swirler with two counter-rotating passages. The results demonstrate that the new sensor and adaptation approach can effectively produce the desired local mesh refinement to match the target losses, measured experimentally. Results shows that the accuracy of pressure losses prediction is mainly controlled by the mesh quality and density in the swirler passages. The refinement also improves the computed velocity and turbulence profiles at the swirler outlet, compared to PIV results. The significant improvement of results confirms that the sensor is able to identify the relevant physics of turbulent flows that is essential for the overall accuracy of LES. Finally, in the appendix, an additional comparison of the sensor fields on tetrahedral and hexahedral meshes demonstrates that the methodology is broadly applicable to all mesh types.

Keywords

LES Swirl injector Pressure losses Adaptive mesh refinement 

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.CERFACSToulouse Cedex 01France
  2. 2.IMFT, Allée du Professeur Camille SoulaToulouseFrance
  3. 3.School of Engineering and Materials ScienceQueen Mary University of LondonLondonUK

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