Turbulence Models Database

A comprehensive reference for selecting and configuring turbulence models in computational fluid dynamics (CFD) simulations.

Overview of Turbulence Modeling

Turbulence is a chaotic, three-dimensional, time-dependent flow phenomenon characterized by random fluctuations in velocity, pressure, and other flow quantities. Direct numerical simulation (DNS) of turbulent flows is computationally prohibitive for most engineering applications, necessitating turbulence modeling approaches.

Modeling Approaches Hierarchy

1. DNS (Direct Numerical Simulation): Resolves all turbulent scales, no modeling
2. LES (Large Eddy Simulation): Resolves large scales, models small scales
3. RANS (Reynolds-Averaged Navier-Stokes): Models all turbulent scales
4. Laminar: No turbulence modeling

RANS Turbulence Models

RANS models solve time-averaged equations and model turbulent fluctuations using the Reynolds stress concept. They are the most widely used in industrial CFD due to computational efficiency.