AutonLift

Syntax

Defined in couplingProperties dictionary.

forceModels
(
    AutonLift
);
AutonLiftProps
{
    velFieldName        word;
    CL                  scalar;
    vorticityInterpolationType word;
    UInterpolationType  word;

    // (optional) forceSubModel switches
    treatForceExplicit  switch;
    verbose             switch;
    interpolation       switch;
    scalarViscosity     switch;
    nu                  scalar;
};

velFieldName = name of the finite volume fluid velocity field (default: “U”)
CL = lift coefficient (default: 0.5)
interpolation = if true interpolates the flow quantities to the particle position (default: false)
vorticityInterpolationType = interpolation type for vorticity field (default: “cellPointFace”)
UInterpolationType = interpolation type for velocity field (default: “cellPointFace”)
treatForceExplicit = sub model switch, see forceSubModel for details. (default: false)
verbose = sub model switch, see forceSubModel for details (default: false)
scalarViscosity = sub model switch, see forceSubModel for details. (default: false)
nu = value of scalarViscosity. Only used if scalarViscosity is set to true.

This forceModel reads the following forceSubModel switches and overwrites the defaults as indicated in parentheses:

scaleDrag
scaleDH
treatForceExplicit (default: true)
verbose
interpolation
scalarViscosity

Examples

forceModels
(
    AutonLift
);
AutonLiftProps
{
    interpolation   true;
    velFieldName     "U";
    CL              0.5;
}

Description

The AutonLift model calculates the lift force for each particle based on the equations derived in [1] and [2]:

$\vec{F}_\mathrm{L} = C_\mathrm{L} \rho_\mathrm{f} \frac{\pi}{6} V \vec{u}_\mathrm{rel} \times \vec{\omega}$

with $C_\mathrm{L}$ being set by the keyword CL and the vorticity $\vec{\omega} = \nabla \times \vec{u}_\mathrm{f}$ .

The data for this functionality is based on [3].

Literature

[1] T. R. Auton. “The dynamics of Bubbles, Drops, and Particles in Motion in Liquids.” Cambridge, UK, 1983

[2] R. Kurose and S. Komori. “Drag and lift forces on a rotating sphere in a linear shear flow”. Journal of Fluid Mechanics 384 (1999): 183-206

[3] J. B. McLaughlin. “Inertial migration of a small sphere in linear shear flows”. Journal of Fluid Mechanics 224 (1991): 261-274

Restrictions

None.