Large Eddy Simulation

The Large Eddy Simulation (LES, called in German also large eddy simulation ) is a method for the numerical computation of turbulent flows, ie those with high Reynolds numbers.

To the Navier -Stokes equations are spatially and temporally filtered using a low pass filter. Thus, the large vortex structures can be (ie, the large eddies ) calculated directly and the small structures are imaged through a fine-structure model.

Thus, the validity and computational time is between the direct numerical simulation (all flow properties are calculated, the required computing time is essential for the normal application to high) and the solution of the Reynolds equations ( Reynolds - averaged Navier -Stokes, and it is only an average value calculated, but the computation time is considerably less than that of the coarse structure of the simulation or if direct numerical simulation).

The Large Eddy Simulation was originally invented by meteorologists who have always had to calculate flows with very large Reynolds numbers.

• Turbulent flow
• Numerical Mathematics