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Extract Surface Data from 3D-Plot

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Old   December 22, 2016, 07:20
Question Extract Surface Data from 3D-Plot
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Hey everyone,

I am currently trying to extract CFD surface data from the 3D-Model of a blade tip.

In other words, I want to extract the coordinates and cell data from one 3D surface area of the blade and then Project those on a 2D-plane.

Unfortunately, I could not get on with this point so far. So any Ideas/Suggestions are very appreciated.

Thanks!
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Old   December 22, 2016, 14:33
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Germán Salazar
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Say, what kind of elements is your 3D model made out of?

Also, Are you asking how to do it withing tecplot itself or any other way?

Not knowing tecplot well, my two ideas include writing some code to retrieve the information.
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Old   December 22, 2016, 23:57
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Hi,

thanks for your reply.

I am interested in any method to extract the data, so it doesn't need to be in tecplot.

The 3D Model ist made out of FE triangles.
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Old   December 23, 2016, 06:06
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So, if I understand it correctly:
  • you have a 3D surface made out of triangles,
  • you have a model of a blade, and
  • interested in retrieving the blade-tip cells

Assuming the radial direction of the blade is in the same direction of the z-axis, how about you simply calculate the normal of each cell and if it is "mostly" in the z-coord, then it is "flat" enough to be declared a tip cell.

By "mostly" in the z-coord, you can try different values and see which one works, this is simple; for example, for a given cell, if the z-component of the normal divided by its own length > 0.75, then we have "flat" enough cell to be declared a tip cell.

In order to stay away from similarly "flat" cells at the root of the blade, you need to calculate the normal and the flatness test only for cells that are towards the top of the blade, say, above the average z-coord of entire blade; or, if you want, you can hard code some known value but this limits the usage of your script with other blades.

Is this clear? does it help?
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Old   December 23, 2016, 08:25
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Thanks for your help! I'll try it that way.
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