Permeability and Turbulence Over Perforated Plates
| Autor: | Haris Shahzad, Stefan Hickel, Davide Modesti |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Physics::Fluid Dynamics
General Chemical Engineering Permeable walls Fluid Dynamics (physics.flu-dyn) Wall turbulence FOS: Physical sciences General Physics and Astronomy Forchheimer permeability Physics - Fluid Dynamics Physical and Theoretical Chemistry Perforated plates Direct numerical simulation |
| Zdroj: | Flow, Turbulence and Combustion, 109(4) |
| ISSN: | 1573-1987 1386-6184 |
| DOI: | 10.1007/s10494-022-00337-7 |
| Popis: | We perform direct numerical simulations of turbulent flow at friction Reynolds number $$Re_\tau \approx 500{-}2000$$ R e τ ≈ 500 - 2000 grazing over perforates plates with moderate viscous-scaled orifice diameter $$d^+\approx 40-160$$ d + ≈ 40 - 160 and analyse the relation between permeability and added drag. Unlike previous studies of turbulent flows over permeable surfaces, we find that the flow inside the orifices is dominated by inertial effects, and that the relevant permeability is the Forchheimer and not the Darcy one. We find evidence of a fully rough regime where the relevant length scale is the inverse of the Forchheimer coefficient, which can be regarded as the resistance experienced by the wall-normal flow. Moreover, we show that, for low porosities, the Forchheimer coefficient can be estimated with good accuracy using a simple analytical relation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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