Detached-Eddy Simulation

The Detached - Eddy Simulation (DES ) is a method for the numerical solution of three-dimensional flow models.

It is only during a turbulence model calculation. This is achieved depending on Gittergranularität and wall distance as large eddy simulation or as a RANS model.

The Detached Eddy Simulation (DES ) was first published in 1997 by P. Spalart. It is based in its original form to the turbulence model Spalart - Allmaras ( a transport equation), but it is also done research on the application in conjunction with other models.

The DES replaced the wall distance, which occurs as a variable in the Spalart - Allmaras model, in areas far away from the wall by the greatest width of a grid cell. By this formulation, a LES -like behavior of the invoice can be achieved in the wall remote areas. In effect, one obtains as a RANS formulation in the boundary layer and LES formulation in the free stream, so that in each area the most appropriate method (relative accuracy and computational effort ).

Since RANS and LES place different demands on the grid, creating a suitable, divided into zones corresponding lattice has a large impact on the success of the bill. The same applies to the use of numerical methods. However, these are usually forced in the entire computational domain the same, which partly leads to compromises in accuracy.

• Turbulent flow