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dynmaicMesh to reduce a cavity

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Old   January 15, 2016, 09:36
Default dynmaicMesh to reduce a cavity
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Gareth
Join Date: Jun 2010
Posts: 35
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bullmut is on a distinguished road
Hi All

I have been using openFOAM with some success but now to hit the hard stuff.
Well hard for me.
My simulation is that of a channel with a groove. I would like to reduce the groove size as the simulation runs. This is of course a reduced version of the final goal but if i can get an understanding of dynamicMesh i will be more comfortable attacking the larger problem.

The groove reduces in height as the simulation runs. I have a blockMesh for this mesh that has groove as a separate wall boundary.
Quote:
vertices
(
(0 0 0)
(1 0 0)
(0 1 0)
(-1 0 0)
(-2 0 0)
(-2 -1 0)
(-1 -1 0)
(0 -1 0)
(1 -1 0)
(2 -1 0)
(2 0 0)
(0 0 0.1)
(1 0 0.1)
(0 1 0.1)
(-1 0 0.1)
(-2 0 0.1)
(-2 -1 0.1)
(-1 -1 0.1)
(0 -1 0.1)
(1 -1 0.1)
(2 -1 0.1)
(2 0 0.1)
);

blocks
(
hex (0 1 2 0 11 12 13 11) (20 20 1) simpleGrading (1 1 1)
hex (0 2 3 0 11 13 14 11) (20 20 1) simpleGrading (1 1 1)
hex (5 6 3 4 16 17 14 15) (20 20 1) simpleGrading (1 1 1)
hex (6 7 0 3 17 18 11 14) (20 20 1) simpleGrading (1 1 1)
hex (7 8 1 0 18 19 12 11) (20 20 1) simpleGrading (1 1 1)
hex (8 9 10 1 19 20 21 12) (20 20 1) simpleGrading (1 1 1)
);

edges
(
/*arc 1 2 (0.5 0.05 0)
arc 2 3 (-0.5 0.05 0)
arc 12 13 (0.5 0.05 0.1)
arc 13 14 (-0.5 0.05 0.1)*/
);

boundary
(
inlet
{
type patch;
faces
(
(4 5 16 15)
);
}
outlet
{
type patch;
faces
(
//(0 1 4 3)
(9 10 21 20)
);
}
fixedWalls
{
type wall;
faces
(
(5 6 17 16)
(6 7 18 17)
(7 8 19 18)
(8 9 20 19)
(3 4 15 14)
(10 1 12 21)
);
}
groove
{
type wall;
faces
(
(1 2 13 12)
(2 3 14 13)
);
}
frontAndBack
{
type empty;
faces
(
(2 1 0 0)
(2 0 0 3)
(6 5 4 3)
(7 6 3 0)
(8 7 0 1)
(9 8 1 10)
(11 12 13 11)
(11 13 14 11)
(16 17 14 15)
(17 18 11 14)
(18 19 12 11)
(19 20 21 12)
);
}
);

mergePatchPairs
(
);
In the dynamicMeshDict i was thinking of using linearMotion or SDA. Could anyone please direct me towards a tutorial or idea on how to setup the dictionary?

Much obliged
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File Type: png start2.png (18.0 KB, 10 views)
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