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[ICEM] Editing Hexa mesh for Vane tidal turbine

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Old   April 26, 2014, 05:37
Unhappy Editing Hexa mesh for Vane tidal turbine
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Hi all,
My name is Charlie Nguyen who is living in South Koea. I am doing reasearch on Vane tidal turbine using Ansys CFX. I used ICEM for meshing this model. Initially, I made block 2D surface for the 12 blades and converted it into unstructed mesh. And then I extruded them along a curve of 0.62 meters. After that, I used "Rotate" option in Edit Mesh tool for turning a half of Blades's width with 15 degrees. It means that if I choose a plane at the middle of the initially meshed blades width as a center, then look from the left to right, the left half will have 12 blades as the initial state before rotating, and the right one will have 12 blades with rotated 15 degrees. After converting it into unstructed mesh, I exported the Ansys CFX file *.cfx5" for running in CFX-Pre. Unfortunately, it seemed that the Ansys did not recognized what I have done in ICEM. I mean the rotated 15 Blades on the right half are the same as the initial meshing blades before rotating. I do not understand why it is so. What problem did I get in my works on ICEM? Could anyone help me explain why?
Thank you so much and I hope to see any helpful comments from you!
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Old   April 28, 2014, 16:05
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Sebastian Engel
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You wrote that you converted the premesh to unstructured mesh twice. Once before the rotation and once after the rotation. This of course would remove your modifications on the unstructured mesh.

So just for clarification, please check the following...
Did you do the extrusion from the premesh/blocking or from the converted unstructured mesh?
And, did you applied rotation on the blocking or unstructured mesh?

I guess it's also a common mistake, when you work on the premesh forgetting to convert to unstructed mesh before exporting.
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Old   April 28, 2014, 23:22
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Quote:
Originally Posted by bluebase View Post
You wrote that you converted the premesh to unstructured mesh twice. Once before the rotation and once after the rotation. This of course would remove your modifications on the unstructured mesh.

So just for clarification, please check the following...
Did you do the extrusion from the premesh/blocking or from the converted unstructured mesh?
And, did you applied rotation on the blocking or unstructured mesh?

I guess it's also a common mistake, when you work on the premesh forgetting to convert to unstructed mesh before exporting.
Hi Bluebase,
Thank you for your response. After blocking them and converting to unstructed mesh, I extruded the converted unstructured mesh first, and then I rotated a half of blade's width as I mentioned ealier. Finally, I exported them as *.cfx5 for CFX-Pre. I don't know why Ansys CFX-Pre did not regconize what I have done with the steps of rotation in previous step. Do you know why, Bluebase?
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Old   April 29, 2014, 05:30
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Sebastian Engel
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I don't really have an idea why this could happen. I assume there is a small mistake in icem before exporting the mesh.
Did you select shell AND volume cells for rotation?
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