Adaptation and evaluation of a weak recycling strategy for inflow boundary layers in large-eddy simulation
| Autor: | Jérôme Boudet, Alexis Giauque |
|---|---|
| Přispěvatelé: | Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
geography
geography.geographical_feature_category General Computer Science General Engineering Inflow Mechanics Inlet 01 natural sciences 010305 fluids & plasmas 010101 applied mathematics Physics::Fluid Dynamics Boundary layer Amplitude Large-eddy simulation Robustness (computer science) 0103 physical sciences Compressibility Turbulent inflow Recycling [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] 0101 mathematics Spurious relationship Geology Large eddy simulation |
| Zdroj: | Computers and Fluids Computers and Fluids, Elsevier, 2020, pp.104489. ⟨10.1016/j.compfluid.2020.104489⟩ |
| ISSN: | 0045-7930 |
| DOI: | 10.1016/j.compfluid.2020.104489⟩ |
| Popis: | International audience; This article presents a detailed analysis of an improved weak recycling method used to generate turbulent inflow conditions for large-eddy simulations. Answering some of the points raised in the literature, various flat-plate cases are considered in order to evaluate the fidelity and the robustness of the method. It is shown that the distance it takes for the canonical compressible boundary layer to forget its weak recycling inflow turbulence is rather short (< 10 δ, for Re_θ up to 2 340). Yet, the study also reveals that the optimal distance between the inlet and the source plane location used to extract the fluctuations depends on the case at hand with a tendency of compressible simulations to require a sightly larger distance. Cases involving compressibility effects (M = 0.8) and 3D effects (wall in translation perpendicular to the main flow) show that the recycling method remains effective in more complex flows. When using limited resolution inlet flow profiles coming from experiments as an input, spurious fluctuations are observed whose main wavelength equals the recycling distance. This study proposes a strategy to circumvent this drawback by limiting the amplitude of recycled velocity fluctuations with respect to the mean velocity at the inlet. |
| Databáze: | OpenAIRE |
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