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DES hybrid divergence scheme

Hybrid convection scheme of Travin et al. for hybrid RAS/LES calculations.

Properties​

  • Blends two schemes based on local properties including
  • wall distance
  • velocity gradient
  • eddy viscosity
  • Originally developed for DES calculations to blend a low-dissipative scheme, e.g. linear, in the vorticity-dominated, finely-resolved regions and a numerically more robust, e.g. linearUpwind, convection scheme in irrotational or coarsely-resolved regions.

Usage​

The scheme is specified using:

divSchemes
{
    default         none;
    div(phi,U)      Gauss DEShybrid
        linear                    // scheme 1
        linearUpwind grad(U)      // scheme 2
        delta                     // LES delta name, e.g. 'delta', 'hmax'
        0.65                      // CDES coefficient
        30                        // Reference velocity scale
        2                         // Reference length scale
        0                         // Minimum sigma limit (0-1)
        1                         // Maximum sigma limit (0-1)
        1.0e-03                   // Limiter of B function, typically 1e-03
        1.0;                      // nut limiter (if > 1, GAM extension is active)
}

Further information​

Source code:

API:

References:

  • First published in Travin et al. 78
  • Original publication contained a typo for C_H3 constant. Corrected version
with minor changes for 2 lower limiters published in *Spalart et al.*
[@cite spalart_sensitivity_2012]