DES hybrid divergence scheme

Table of Contents

• Properties
• Usage
• Further information

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
        0.65                          // DES coefficient, typically = 0.65
        30                            // Reference velocity scale
        2                             // Reference length scale
        0                             // Minimum sigma limit (0-1)
        1                             // Maximum sigma limit (0-1)
        1e-3;                         // Limiter of B function, typically 1e-03
}

Further information

Source code

• Foam::DEShybrid

References:

• First published in Travin et al. [83]
• Original publication contained a typo for C_H3 constant. Corrected version with minor changes for 2 lower limiters published in Spalart et al. [75]

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