TURB-Scalar. A large database of passive scalar fields advected by 2D Navier-Stokes in the turbulent inverse cascade regime

TL;DR

TURB-Scalar is a comprehensive open-access database of 2D turbulent passive scalar fields from DNS simulations, providing a valuable resource for benchmarking and developing turbulence models, especially for scalar intermittency and anomalous scaling.

Contribution

We present TURB-Scalar, a large, publicly available database of 2D turbulent scalar fields from DNS, facilitating research in turbulence modeling and analysis.

Findings

Scalar fields show universal anomalous scaling.

Data captures intermittency in turbulent transport.

Provides a benchmark for physics-based and data-driven models.

Abstract

We introduce TURB-Scalar, an open-access database comprising approximately $400$ uncorrelated snapshots of two-dimensional turbulent velocity and passive scalar fields, obtained from the turbulent inverse cascade regime. These data are generated through Direct Numerical Simulations (DNS) of the advection-diffusion equation for a passive scalar, $\theta$, with resolution $N=4096$. The database serves as a versatile benchmark for the development and testing of both physics-based and data-driven modeling approaches. The scalar field exhibits intermittent statistics with universal anomalous scaling, making TURB-Scalar a valuable resource for studying turbulent transport phenomena. The database is available at http://smart-turb.roma2.infn.it.