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Files input for Turbogrid

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Old   July 10, 2014, 23:34
Default Files input for Turbogrid
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Jun Milan
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Hi all,

I want to do simulations with CFX on an axial rotor but first I must do the meshing on Turbogrid. I read the tutorial and it was saying that I need to input the files: hub.curve; blade.curve and shroud.curve into Turbogrid.

Can you give me please more details on how to make these files ? (do you have any documentary on this or show me please how to do it)
More precisely, I mean:
1) The coordinates of the points that consist the hub; the shroud and the blade must be all expressed in the same cartesian coordinate ?? or can I have different cartesian references, one for the hub, one for the shroud and one for the blade ?
2) My blade consist of 11 airfoils. Is it important that the first airfoil be on the hub and the last airfoil be on the shroud ? I have done a test where in the input files (hub.curve; blade.curve and shroud.curve) there is a gap between the blade and the shroud; and on the other hand the blade interfere with the hub. But when I load them in Turbogrid, there is no gap nor interference (the blade fits well within the shroud and the hub). Apparently, Turbogrid is cutting the geometry next to the hub and extruding it next to the shroud. Do you know what turbo grid is exactly doing here? In this case, does Turbogrid change the geometry ? And what is best to do ? I mean is it better that in the files, the blade fit the hub and the shroud ? Or it does not matter, I can have gaps or interferences between them, and turbogrid will correct them itself ?
3) Are the order of the points in the input files (blade.curve, hub.curve and shroud.curve) important ?

4) I need to mesh the rotor and stator of an axial compressor. I'm planning to do the rotor and stator separately on two turbogrid sessions (with WORKBENCH) and then load both of the geometry in Pre CFX and CFX. My question is this: does the points that consist the hub, shroud and blade of both rotor and stator be expressed in the same cartesian coordinate ? Or can I have two cartesian reference, one for the rotor (hub, blade, shroud) and one for the stator (hub, blade, shroud) ? And what about the interaction surface between them? Any idea on how to define it ?

Thank you very much for your help,

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