What is difference between RAN, LES and DNS

Question

Accepted Answer

RAN, LES, and DNS are different approaches used in computational fluid dynamics (CFD) to model turbulent flows.

RAN (Reynolds-Averaged Navier-Stokes) models average the flow properties over time, suitable for industrial applications.
LES (Large Eddy Simulation) resolves large turbulent structures while modeling smaller ones, suitable for complex flows.
DNS (Direct Numerical Simulation) solves all scales of turbulence without modeling, computationally expensive and used for fundamental research.
RAN is less accurate but computationally efficient, LES is more accurate but computationally expensive, and DNS is the most accurate but extremely computationally expensive.
Each approach has its own strengths and weaknesses depending on the application and desired level of accuracy.

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