925e6b5b02
In addition to the current syntax, particle forces can now also be
specified with a named dictionary and a type entry. This allows multiple
forces of the same type to be used. For example:
particleForces
{
// Existing syntax. The model typename, either on it's own
// or heading a dictionary of model parameters.
gravity;
ErgunWenYuDrag
{
alphac alpha.air;
}
// New syntax. An arbitrary name, followed by a dictionary
// containing a type entry, and any model parameters.
gravity2
{
type gravity;
}
drag2
{
type ErgunWenYuDrag;
alphac alpha.air;
}
}
A scaled force has also been added. This is a wrapper around another
particle force model, and applies a scaling factor to the force value.
It can be used to tune the models, or to blend two or more models.
particleForces
{
// Tuning the simulation by reducing the pressure gradient force
scaled1
{
type scaled;
factor 0.94;
forceType pressureGradient;
U U;
}
// Blending two drag models
scaled2
{
type scaled;
factor 0.2;
forceType sphereDrag;
}
scaled3
{
type scaled;
factor 0.8;
forceType ErgunWenYuDrag;
alphac alpha.air;
}
}
This work was supported by Moritz Hoefert, at Evonik
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