"CFDEMproject Website"_lws - "Main Page"_main :c

:link(lws,http://www.cfdem.com)
:link(main,CFDEMcoupling_Manual.html)

:line

smoothingModel constDiffAndTemporalSmoothing command :h3

[Syntax:]

Defined in dictionary depending on the application.

smoothingModel constDiffAndTemporalSmoothing;
constDiffAndTemporalSmoothingProps
\{
    lowerLimit                    number1;
    upperLimit                    number2;
    smoothingLength               lengthScale;
    smoothingLengthReferenceField lengthScaleRefField;
    smoothingStrength             smoothingStrength;
    correctBoundary               switch1;
    verbose;
\} :pre

{number1} = scalar fields will be bound to this lower value :ulb,l
{number2} = scalar fields will be bound to this upper value :l
{lengthScale} = length scale over which the exchange fields will be smoothed out :l
{lengthScaleRefField} = length scale over which reference fields (e.g., the average particle velocity) will be smoothed out. Should be always larger than lengthScale. If not specified, will be equal to lengthScale. :l
{smoothingStrength} = control parameter gamma for the smoothing, lower value yields stronger smoothing (gamma = 1 results in an equal contribution from the un-smoothed and smoothed fields)  :l
{correctBoundary} = (optional, default false) activate to use purely temporal smoothing on the boundary field, avoids interpolation errors near the domain boundary :l
{verbose} = (optional, default false) flag for debugging output :l
:ule

[Examples:]

constDiffAndTemporalSmoothingProps
\{
    lowerLimit       0.1;
    upperLimit       1e10;
    smoothingLength  1500e-6;
    smoothingLengthReferenceField 9000e-6;
    referenceField   "p";
    gamma            1.0;
\} :pre

[Description:]

The {constDiffAndTemporalSmoothing} model is a smoothing model that combines the
spacial smoothing of "constDiffSmoothing"_smoothingModel_constDiffSmoothing.html and
the temporal smoothing of "temporalSmoothing"_smoothingModel_temporalSmoothing.html for
the relaxation of a desired quantity. This model can be used to filter out
high-frequency fluctuations (e.g. numerical noise) controlled via the smoothing length
and the temporal smoothing strength parameter gamma.

For more details, see "Vångö et al. (2018)"_#Vångö2018 and "Nijssen et al. (2020)"_#Nijssen2020.

:link(Vångö2018)
[(Vångö2018)] M. Vångö, S. Pirker, T. Lichtenegger. (2018):
"Unresolved CFD-DEM modeling of multiphase flow in densely packed particle beds",
Applied Mathematical Modelling

:link(Nijssen2020)
[(Nijssen2020)] T.M.J. Nijssen, J.A.M. Kuipers, J. van der Stel, A.T. Adema, K.A. Buist. (2020):
"Complete liquid-solid momentum coupling for unresolved CFD-DEM simulations",
International Journal of Multiphase Flow

[Restrictions:]

This model is tested in a limited number of flow situations.

[Related commands:]

"smoothingModel"_smoothingModel.html
"constDiffSmoothing"_smoothingModel_constDiffSmoothing.html
"temporalSmoothing"_smoothingModel_temporalSmoothing.html