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-   -   Axisymmetric opposed jet configuration (http://www.cfd-online.com/Forums/openfoam-solving/59775-axisymmetric-opposed-jet-configuration.html)

gfcoppola March 20, 2007 09:39

Hi all, I am new to OF so m
 
Hi all,

I am new to OF so my question may be stupid, anyway, I am trying to simulate an axisymmetric opposed jet configuration, where each jet has a circular flange flat with the exit section. I am using icoFoam from FoamX and blockMesh to generate the mesh. Below is the blockMeshDict file:

arguments "/$HOME/OpenFOAM/$HOME-1.3/run/tutorials/icoFoam/counterflow" off;

convertToMeters 0.001;

vertices
(
(-14.5852 0 0)
(-0.297656 0 0)
(-0.297656 1.19063 -0.051984)
(-14.5852 1.19063 -0.051984)
(0.297656 0 0)
(0.297656 1.19063 -0.051984)
(14.5852 0 0)
(14.5852 1.19063 -0.051984)
(0.297656 100 -4.366094)
(-0.297656 100 -4.366094)
(-0.297656 1.19063 0.051984)
(-14.5852 1.19063 0.051984)
(0.297656 1.19063 0.051984)
(14.5852 1.19063 0.051984)
(0.297656 100 4.366094)
(-0.297656 100 4.366094)
);

blocks
(
hex (0 1 2 3 0 1 10 11) (39 20 1) simpleGrading (0.04 0.3 1)
hex (1 4 5 2 1 4 12 10) (10 20 1) simpleGrading (1 0.3 1)
hex (4 6 7 5 4 6 13 12) (39 20 1) simpleGrading (25 0.3 1)
hex (2 5 8 9 10 12 14 15) (10 395 1) simpleGrading (1 25 1)
);

edges
(
);
patches
(
empty axis
(
(0 1 1 0)
(1 4 4 1)
(4 6 6 4)
)

wedge back
(
(0 1 2 3)
(0 1 10 11)
(1 4 5 2)
(1 4 12 10)
)

wedge front
(
(4 6 7 5)
(4 6 13 12)
(2 5 8 9)
(10 12 14 15)
)

patch lx_inlet
(
(0 0 11 3)
)

patch rx_inlet
(
(6 6 7 13)
)

wall top_flange
(
(2 3 11 10)
(9 2 10 15)
)

wall btm_flange
(
(7 5 12 13)
(5 8 14 12)
)
patch outlet
(
(8 9 15 14)
)

);

mergePatchPairs
(
);


The axis of symmetry is along X, the radius along Y and the one cell thickness along Z. The mesh is quite corse and I do get the 'Severe skewness' warning, but I still expect the solution to be qualitatively correct.
When I run the simulation, the result seem to be much like the flow between 2D flanged jets, as the velocity between the flanges seem to be constant along the radius.
I also used another file, which gives the same result, but the FRONT and BACK (wedge) palnes are parallel for the flanges and at an angle for the jets.
I am very likely doing some very stupid mistake, and would appreciate if you could help.

Regards,
Gianfilippo

gfcoppola March 22, 2007 18:57

Hi all, I am trying to simu
 
Hi all,

I am trying to simulate an axisymmetric opposed jet configuration, where each jet has a circular flange at its exit section. I am using icoFoam from FoamX and blockMesh to generate the mesh.
The axis of symmetry is along X, the radius along Y and the one cell thickness along Z.
I am getting the right Vx profile, but a Vy=0 and Vz non zero.

Can someone comment on this, please ?

Thanks
Gianfilippo


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