Atwood effects on nonlocality of the scalar transport closure in three-dimensional Rayleigh-Taylor mixing Article Swipe

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Dana Lynn Ona-Lansigan Lavacot , Ali Mani , Brandon Morgan ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2505.09850

The importance of nonlocality is assessed in modeling mean scalar transport for turbulent Rayleigh-Taylor (RT) mixing at different Atwood numbers. Building on the two-dimensional incompressible work of Lavacot et al. (2024, JFM), the present work extends the Macroscopic Forcing Method (MFM) to variable density problems in three-dimensional space to measure moments of the generalized eddy diffusivity kernel in RT mixing for increasing Atwood numbers (A=0.05, 0.3, 0.5, 0.8). It is found that as A increases: 1) the eddy diffusivity moments become asymmetric, and 2) the higher-order eddy diffusivity moments become larger relative to the leading-order diffusivity, indicating that nonlocality becomes more important at higher A. There is a particularly strong temporal nonlocality at higher $A$, suggesting stronger history effects. The implications of these findings for closure modeling for finite-Atwood RT are discussed.

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2505.09850
PDF: https://arxiv.org/pdf/2505.09850
OA Status: green
OpenAlex ID: https://openalex.org/W4415198711

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DOI: https://doi.org/10.48550/arxiv.2505.09850

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Title: Atwood effects on nonlocality of the scalar transport closure in three-dimensional Rayleigh-Taylor mixing

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Type: preprint

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Language: en

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Publication year: 2025

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Publication date: 2025-05-14

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Authors: Dana Lynn Ona-Lansigan Lavacot, Ali Mani, Brandon Morgan

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Landing page: https://arxiv.org/abs/2505.09850

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PDF URL: https://arxiv.org/pdf/2505.09850

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Cited by: 0

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