[Roh]

Hi guys
I've a geometry and several days ago meshed it and ran a calculation (planar not axisymetric) in the fluent and everything was great and got a very well result. here is my mesh:



Some closer images:









Now just tried to ran a calculation in axisymmetric form. I checked the mesh in fluent and got this:

 Domain Extents:
   x-coordinate: min (m) = -1.083841e+01, max (m) = 4.101589e+00
   y-coordinate: min (m) = -6.191000e-01, max (m) = 1.870900e+00
 Volume statistics:
WARNING: 61090 cells with non-positive volume detected.
   minimum volume (m3): -1.734110e-03
   maximum volume (m3): 5.121033e-02
     total volume (m3): 1.510799e+02
   minimum 2d volume (m3): 3.523500e-07
   maximum 2d volume (m3): 4.443599e-03
 Face area statistics:
   minimum face area (m2): 1.683703e-04
   maximum face area (m2): 8.879440e-02
 Checking mesh..........
WARNING: left-handed faces detected on zone   1: 35898 right-handed,  3273 left-handed.
WARNING: left-handed faces detected on zone   8:   164 right-handed,    97 left-handed.
WARNING: left-handed faces detected on zone   9:     0 right-handed,     1 left-handed.
Info: Used modified centroid in 89 cell(s) to prevent left-handed faces.....
WARNING: Invalid axisymmetric mesh with nodes lying below the x-axis........................
Done.

WARNING: Mesh check failed.

WARNING: left-handed faces detected on zone   1: 12113 right-handed, 26134 left-handed.
WARNING: left-handed faces detected on zone   5:     0 right-handed,   144 left-handed.
WARNING: left-handed faces detected on zone   6:   170 right-handed,    96 left-handed.
WARNING: left-handed faces detected on zone   8:     0 right-handed,    45 left-handed.
WARNING: left-handed faces detected on zone   1: 13644 right-handed, 25817 left-handed.
WARNING: left-handed faces detected on zone   5:     0 right-handed,   101 left-handed.
WARNING: left-handed faces detected on zone   8:     0 right-handed,    76 left-handed.
WARNING: left-handed faces detected on zone   1:  9675 right-handed, 26530 left-handed.
WARNING: left-handed faces detected on zone   5:     0 right-handed,   120 left-handed.
WARNING: left-handed faces detected on zone   1: 11027 right-handed, 10339 left-handed.
WARNING: left-handed faces detected on zone   7:     0 right-handed,    40 left-handed.
WARNING: left-handed faces detected on zone   8:     0 right-handed,   202 left-handed.
WARNING: left-handed faces detected on zone   9:     0 right-handed,    33 left-handed.
WARNING: left-handed faces detected on zone   1: 12556 right-handed, 30261 left-handed.
WARNING: left-handed faces detected on zone   5:     0 right-handed,    95 left-handed.
WARNING: left-handed faces detected on zone   8:     0 right-handed,    82 left-handed.
WARNING: left-handed faces detected on zone   9:     0 right-handed,     6 left-handed.
To get more detailed information about the mesh check failure
increase the mesh check verbosity via the TUI command
/mesh/check-verbosity.
Fluent can also try to fix the mesh check problems via the TUI command
/mesh/repair-improve/repair.

And when hit the Quality, got this:

Mesh Quality:

Minimum Orthogonal Quality =  0.00000e+00
(To improve Orthogonal quality , use "Inverse Orthogonal Quality" in Fluent Meshing,
 where Inverse Orthogonal Quality = 1 - Orthogonal Quality)
Warning: minimum Orthogonal Quality below 0.01.

Maximum Aspect Ratio =  1.87832e+19

Fluent can try to improve the mesh quality via the TUI command
/mesh/repair-improve/improve-quality

Then I think I have three problem. Orthogonality, Aspect Ratio and cells with non-positive volume.
Must fix or remesh the geometry but don't know how. Two questions:
1- What kind of cell is better to choose? tetrahedron, tri,...?
2- How to grid edges/lines?

Any suggestion would be appreciate

[Gweher]

Hi Roh,

If you take a closer look at the output message you'll see a hint :

Originally Posted by Roh

[CODE] Domain Extents:
Checking mesh..........
WARNING: left-handed faces detected on zone 1: 35898 right-handed, 3273 left-handed.
WARNING: left-handed faces detected on zone 8: 164 right-handed, 97 left-handed.
WARNING: left-handed faces detected on zone 9: 0 right-handed, 1 left-handed.
Info: Used modified centroid in 89 cell(s) to prevent left-handed faces.....
WARNING: Invalid axisymmetric mesh with nodes lying below the x-axis........................
Done.

WARNING: Mesh check failed.

You need to create your geometry // mesh in the positive XY plane, it's a requirement for the axisym analysis.

Have fun