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Dynamic slip wall model for large-eddy simulation.

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This summary is machine-generated.

This study introduces a dynamic slip wall model for large-eddy simulations (LES). The new model accurately predicts turbulent flow statistics without needing predefined coefficients, improving high-Reynolds-number flow simulations.

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Area of Science:

  • Fluid Dynamics
  • Computational Science

Background:

  • Wall modeling in large-eddy simulation (LES) is crucial for high-Reynolds-number turbulent flows, but current models require assumptions and predefined coefficients.
  • Existing models often underestimate wall stress and struggle with near-wall resolution requirements.
  • The no-slip boundary condition is typically replaced by a Neumann condition, while maintaining no-transpiration.

Purpose of the Study:

  • To analyze the Robin (slip) boundary condition with transpiration for wall-modeled LES.
  • To develop a dynamic slip wall model free of a priori specified coefficients.
  • To investigate the model's performance in various turbulent flow scenarios.

Main Methods:

  • Investigated the effect of slip boundary conditions on flow statistics using LES of channel and flat-plate boundary layers.
  • Derived the relationship between slip boundary conditions and wall stress.
  • Formulated a dynamic procedure for slip coefficients and tested the model in diverse LES cases.

Main Results:

  • The slip condition effectively compensates for mean momentum deficits/excesses at the wall.
  • The dynamic slip wall model accurately predicts one-point turbulence statistics across different flow configurations, Reynolds numbers, and grid resolutions.
  • The model alleviates the under-estimation of wall stress by conventional subgrid-scale models.

Conclusions:

  • The proposed dynamic slip wall model offers an accurate and adaptable approach for wall-modeled LES.
  • This method overcomes limitations of traditional wall models, particularly in high-Reynolds-number and non-equilibrium flows.
  • The dynamic slip condition provides a robust framework for improved turbulence simulation near walls.