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axial velocity definition

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Old   May 18, 2014, 12:55
Default axial velocity definition
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Ali reza
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hi everyone
I have a question about axial velocity in fluent specially in 3D curved pipes.
It is an elbow which the velocity inlet is in X direction and I have got contour in X direction and it shows velocity correctly but in the same section I have got an axial velocity and it shows wrong contour and quantities I can't understand axial velocity and I don't know is it trustful or not?
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Old   May 19, 2014, 07:46
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A-A Azarafza
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Hi,
It seems that you didn't define the axial direction correctly in your geometry modeler. I think, you should redefine the coordinate.
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Old   May 19, 2014, 15:04
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Behrooz Jamshidi
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For axisymmetric problems, in which the rotation axis must be the x axis, the x direction is the axial direction and the y direction is the radial direction. (If you model axisymmetric swirl, the swirl direction is the tangential direction.)

Axial velocity means the velocity in x direction in axisymmetric problems. So when your solver is not axisymmetric, axial velocity is meaningless (but sometimes has meaning!).
Get your z-velocity contour. Is it the same as your axial velocity contour?
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Old   May 19, 2014, 15:33
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Ali reza
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thanks for support the velocity contour in z direction gives me just zero and I think at inlet I don't have any vector in z direction,
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Old   May 21, 2014, 19:10
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Sean Delfel
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Quote:
Originally Posted by 1988 View Post
hi everyone
I have a question about axial velocity in fluent specially in 3D curved pipes.
It is an elbow which the velocity inlet is in X direction and I have got contour in X direction and it shows velocity correctly but in the same section I have got an axial velocity and it shows wrong contour and quantities I can't understand axial velocity and I don't know is it trustful or not?
If I follow correctly, your simulation is 3D, correct? I don't have Fluent in front of me, but I believe you define the axis that sets the axial, radial and tangential directions for the contour plots under the cell zone conditions panel. Does that help?
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Old   May 22, 2014, 14:00
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Ali reza
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thanks for your support that's right but I don't know how to do that moreover the geometry was made by some pictures and I don't know all of angels and dimensions (it is 3d pipe that bends are not in the same plane) so finding axial velocity in each part by calculating the angels is some how needs great deal of effort.
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