Communication Dans Un Congrès Année : 2025

Bridging Experimental shadowgraphs and DNS in Turbulent Convection Using physically-informed U-Net

Résumé

Shadowgraph data holds significant potential, as it incorporates depth-of-field effects, enabling the extraction of richer physical information [1, 2]. The integration of physical information into it using Physics-Informed Neural Networks (PINNs) has been shown to successfully reconstruct flow fields in compressible, inviscid flows [3]. In this study, we aim to extract 3D field information from experimental shadowgraph data of turbulent convection using a trained deep learning model. Specifically, we em- ploy a U-Net architecture to predict the temperature field over a 2D slice from shadowgraph. However, ground-truth field data is often unavailable or incomplete from experiments. Therefore, as first step, we use numerical shadowgraphs (simply modeled as Laplacian of temperature field) as input and tempera- ture field as output from direct numerical simulation (DNS). Preliminary results, presented in Figure 1, highlight the potential of this approach. Furthermore, we investigate the feasibility of simultaneously ex- tracting velocity fields alongside temperature fields. Finally, we apply the trained model to experimental shadowgraph images as DNS compliments the experimental conditions.
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hal-04924440 , version 1 (31-01-2025)

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  • HAL Id : hal-04924440 , version 1

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Jai Kumar, Anne Sergent, Francesca Chillà, Julien Salort, Didier Lucor. Bridging Experimental shadowgraphs and DNS in Turbulent Convection Using physically-informed U-Net. Joint event Euromech Colloquium on Data-Driven Fluid Dynamics/2nd ERCOFTAC Workshop on Machine Learning for Fluid Dynamics, Apr 2025, London, United Kingdom. ⟨hal-04924440⟩
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