Turbulent Intensity too large!

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 October 2, 2008, 12:25 Turbulent Intensity too large! #1 donde Guest   Posts: n/a Fluent's modeling of duct incompressible flow shows turbulent intensity about I=100-400% in regions closed to the walls, in the vortex wake after central body and outlet jet. Turbulence model is k-epsilon. Mesh is rather fine (y+=3). Pressure inlet and outlet conditions are set to I=1% and hydraulics diameter=2m. Would you help me?

 October 2, 2008, 15:09 Re: Turbulent Intensity too large! #2 John S. Guest   Posts: n/a What kind of mesh are you analyzing?

 October 2, 2008, 21:00 Re: Turbulent Intensity too large! #3 donde Guest   Posts: n/a Mesh generating fragments: 'undo begingroup' 'blayer create "bl_virtual_wall_3" first 0.0001 growth 1.2 total 0.0186688 \' 'rows 20 transition 1 trows 0 continuous' 'blayer attach "bl_virtual_wall_3" face "face_throat_1" edge "virtual_wall_3"' 'undo endgroup' ... 'face mesh "face_throat_1" triangle size 1' 'face mesh "face_throat_2" triangle size 1' 'face mesh "face_before_grid" triangle size 1' 'face mesh "face_grid" map size 1' 'face mesh "face_after_grid" map size 1' 'face mesh "face_camera" pave size 1' 'face mesh "face_dif" map size 1' 'face mesh "face_outlet" pave size 1'

 October 4, 2008, 05:36 Re: Turbulent Intensity too large! #4 Friend Guest   Posts: n/a Hi, May I suggest that you have a look into the reference values used in calculating the intensity as that may give you a clearer meaning of what that intensity means in your model.

 October 20, 2008, 13:22 Re: Turbulent Intensity too large! #5 donde Guest   Posts: n/a Friend: Thanks for the help!

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