smoothingModel temporalSmoothing command¶

Syntax¶

Defined in dictionary depending on the application.

smoothingModel temporalSmoothing;
temporalSmoothingProps
{
    lowerLimit number1;
    upperLimit number2;
    refField   referenceField;
    gamma      smoothingStrength;
}

• number1 = scalar fields will be bound to this lower value

• number2 = scalar fields will be bound to this upper value

• referenceField = reference to the un-smoothed field required for the relaxation operation

• smoothingStrength = control parameter for the smoothing, lower value yields stronger smoothing (gamma = 1 results in an equal contribution from the un-smoothed and smoothed fields)

Examples¶

temporalSmoothingProps
{
    lowerLimit     0.1;
    upperLimit     1e10;
    referenceField "p";
    gamma          1.0;
}

Description¶

The temporalSmoothing model is a smoothing model that utilizes temporal relaxation of a desired quantity. This model can be used to filter out high-frequency fluctuations (e.g. numerical noise) controlled via the control parameter gamma. Note that this model does NOT smooth the calculated fields, instead smoothing is performed on a separate (smooth) field which uses the calculated (un-smooth) field as a reference. Thus its usage is limited and CANNOT be used to smooth the exchange fields similar to other smoothing models. For further information see Vångö et al., “Unresolved CFD-DEM modeling of multiphase flow in densely packed particle beds”, Appl. Math. Model. (2018).

Restrictions¶

This model does NOT smooth the calculated fields and can therefore NOT be used as a general smoothing model to smoothen the exchange fields. Attempting this will generate an error.

Related commands¶

smoothingModel