Generalizable super-resolution turbulence reconstruction from minimal training data

TL;DR

This paper introduces SoZoGAN, a novel zero-shot super-resolution framework for turbulent flow reconstruction that generalizes across different flow types using minimal training data and a scale-based decomposition strategy.

Contribution

The paper presents a scale-oriented zonal GAN framework trained on a single dataset, enabling high-fidelity turbulence super-resolution across diverse flow scenarios without retraining.

Findings

High accuracy in zero-shot super-resolution of untrained flows

Effective cross-domain generalization to various turbulence types

Robust performance on both homogeneous and inhomogeneous turbulence

Abstract

Fully resolving turbulent flows remains challenging due to turbulent systems' multiscale complexity. Existing data-driven approaches typically demand expensive retraining for each flow scenario and struggle to generalize beyond their training conditions. Leveraging the universality of small-scale turbulent motions (Kolmogorov's K41 theory), we propose a Scale-oriented Zonal Generative Adversarial Network (SoZoGAN) framework for high-fidelity, zero-shot turbulence generation across diverse domains. Unlike conventional methods, SoZoGAN is trained exclusively on a single dataset of moderate-Reynolds-number homogeneous isotropic turbulence (HIT). The framework employs a zonal decomposition strategy, partitioning turbulent snapshots into subdomains based on scale-sensitive physical quantities. Within each subdomain, turbulence is synthesized using scale-indexed models pre-trained solely on the HIT database. SoZoGAN demonstrates high accuracy, cross-domain generalizability, and robustness in zero-shot super-resolution of unsteady flows, as validated on untrained HIT, turbulent boundary layer, and channel flow. Its strong generalization, demonstrated for homogenous and inhomogenous turbulence cases, suggests potential applicability to a wider range of industrial and natural turbulent flows. The scale-oriented zonal framework is architecture-agnostic, readily extending beyond GANs to other deep learning models.