sayadi_moin12

Summary

Large eddy simulation of controlled transition to turbulence. T. Sayadi and P. Moin. Physics of Fluids, 24(114103), 2012. (URL)

Abstract

Large eddy simulation of H- and K-type transitions in a spatially developing zero-pressure-gradient boundary layer at Ma=0.2 is investigated using several subgrid scale (SGS) models including constant coefficient Smagorinsky and Vreman models and their dynamic extensions, dynamic mixed scale-similarity, dynamic one-equation kinetic energy model, and global coefficient Vreman models. A key objective of this study is to assess the capability of SGS models to predict the location of transition and the skin friction throughout the transition process. The constant coefficient models fail to detect transition, but the dynamic procedure allows for a negligible turbulentviscosity in the early transition region. As a result, the point of transition is estimated correctly. However, after secondary instabilities set in and result in the overshoot in the skin friction profile, all models fail to produce sufficient subgrid scale shear stress required for the correct prediction of skin friction and the mean velocity profile. The same underprediction of skin friction persists into the turbulent region. Spatially filtered direct numerical simulation data in the same boundary layers are used to provide guidelines for SGS model development and validation.

Bibtex entry

@ARTICLE { sayadi_moin12,
    AUTHOR = { T. Sayadi and P. Moin },
    TITLE = { Large eddy simulation of controlled transition to turbulence },
    JOURNAL = { Physics of Fluids },
    VOLUME = { 24 },
    NUMBER = { 114103 },
    YEAR = { 2012 },
    ABSTRACT = { Large eddy simulation of H- and K-type transitions in a spatially developing zero-pressure-gradient boundary layer at Ma=0.2 is investigated using several subgrid scale (SGS) models including constant coefficient Smagorinsky and Vreman models and their dynamic extensions, dynamic mixed scale-similarity, dynamic one-equation kinetic energy model, and global coefficient Vreman models. A key objective of this study is to assess the capability of SGS models to predict the location of transition and the skin friction throughout the transition process. The constant coefficient models fail to detect transition, but the dynamic procedure allows for a negligible turbulentviscosity in the early transition region. As a result, the point of transition is estimated correctly. However, after secondary instabilities set in and result in the overshoot in the skin friction profile, all models fail to produce sufficient subgrid scale shear stress required for the correct prediction of skin friction and the mean velocity profile. The same underprediction of skin friction persists into the turbulent region. Spatially filtered direct numerical simulation data in the same boundary layers are used to provide guidelines for SGS model development and validation. },
    URL = { http://dx.doi.org/10.1063/1.4767537 },
}