viscForce

Syntax

Defined in couplingProperties dictionary.

forceModels
(
    viscForce;
);
viscForceProps
{
    velocityFieldName  word;
    useAddedMass       scalar;
    suppressProbe      switch;
    divTauInterpolationType word;
    useTotalViscosity    Switch;

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

velocityFieldName = name of the finite volume fluid velocity field. (default: “U”)
useAddedMass = coefficient of added mass accounted for. Added mass is only accounted for, if this keyword is present.
suppressProbe = can be used to suppress the output of the probe model. (default: false)
divTauInterpolationType = interpolation type for div(Tau) field. (default: “cellPointFace”)
useTotalViscosity = use the total viscosity, e.g. when using a non-Newtonian viscosity (default: false)

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
(
    viscForce;
);
viscForceProps
{
    velocityFieldName "U";
}

Description

Calculates the particle based viscous force

$\vec{F} = \nabla\cdot\tau \: V$

with the viscous stress field $\tau = \mu_\mathrm{f} \left( \nabla\vec{u} + \nabla\vec{u}^T \right)$ .

For more details ee also: Z. Y. Zhou, S.B. Kuang, K.W. Chu and A. B. Yu. “Discrete particle simulation of particle-fluid flow: model formulations and their applicability”. Journal of Fluid Mechanics 661 (2010): 482-510

Restrictions

none.