WAVE_DAMPING

Type

AcuSolve Command

Syntax

WAVE_DAMPING_SOURCE {parameters...}

Qualifier

This command has no qualifier.

Parameters

wave_damping_type (enumerated) (=none): Type of wave damping to be applied. If none, no damping is applied.

none

No damping.

linear

Linear damping model is applied.

wave_damping_distance or dist real (=0): Distance from the outlet surface where the damping source term is active.

wave_damping_coefficient or coef real (=10): Coefficient multiplying the damping source term.

Description

This command is used to damp a surface wave in a multiphase flow problem by adding momentum source per unit volume to the momentum equation along the direction of gravity. The momentum source per unit volume term takes the following form:

(1)

S (x) = - C ρ | U_{z} | {(\frac{x - x_{O}}{x_{D}})}^{2}

$S (x) = - C ρ | U_{z} | {(\frac{x - x_{O}}{x_{D}})}^{2}$

where C is the wave damping coefficient, $ρ$ $ρ$ is the density, $U_{Z}$ $U_{Z}$ is the velocity component along gravity, x is the local coordinate where the source term is being applied, $x_{D}$ $x_{D}$ and $x_{0}$ $x_{0}$ are the wave damping distance and the coordinate of the outlet surfaces, respectively.

Wave damping with a linear model can be specified as follows:

WAVE_DAMPING_SOURCE {
    wave_damping_type	         = linear
    wave_damping_distance	 = 5
    wave_damping_coefficient     = 10
}

Optionally, the outlet surface can be excluded from the damping zone calculation by setting the boolean wave_damping to "off" within the SIMPLE_BOUNDARY_CONDITION command.