This version is very inefficient in parallel and does not provide the
-parallelSource or -parallelTarget options which will need to be
reinstanted in the future or we could revert mapFields to the
OpenFOAM-2.2 version.
Consider a block describing a channel with two opposite walls.
Currently in order to grade the mesh towards the walls and have a
uniform region in the centre the channel would need to be spit into 3
blocks. With the new multi/sectional grading this can be achieved in a
single block e.g.
blocks
(
hex (0 1 2 3 4 5 6 7) (20 60 20)
simpleGrading
(
1
((0.2 0.3 4) (0.6 0.4 1) (0.2 0.3 0.25))
1
)
);
In this example the block is divided uniformly in the x and z -directions
and split into three grading sections in the y-direction described by
three triples: ((0.2 0.3 4) (0.6 0.4 1) (0.2 0.3 0.25)). Each of the
grading sections is described by a triple consisting of the fraction of
the block, the fraction of the divisions and the grading ratio (size of
first division/size of last division). Both the fraction of the block
and the fraction of the divisions are normalized automatically so they
can be specified scaled in anyway, e.g. as percentages:
blocks
(
hex (0 1 2 3 4 5 6 7) (20 60 20)
simpleGrading
(
1
((2 3 4) (6 4 1) (2 3 0.25))
1
)
);
and they need not sum to 1 or 100.
This is very new functionality and not well tested but backward
compatibility has been well tested so all existing blockMeshDicts should
parse correctly.
in particular to pick-up the DebugSwitches from system/controlDict at
global construction time.
Disadvantage is that system/controlDict is only picked-up if the
OpenFOAM application is executed IN the case directory. The directory
provided by the -case option is not yet known as the arguments have not
yet been parsed.
Furst, J. (2013).
Numerical simulation of transitional flows with laminar kinetic energy.
Engineering MECHANICS, 20(5), 379-388.
Thanks to Jan-Niklas Klatt for analysing problems with and correcting
the implementation and testing corrections to the model proposed by
Furst.
