# Thread: Apply a "skin" or surface to a skeleton of paralle

1. ## Apply a "skin" or surface to a skeleton of paralle

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I’m trying to create an accurate 3D model in order to be input into FEA and CFD solvers. Therefore the geometry needs to be pretty accurate!

I need to essentially draw a pipe with an asymmetric “bulge” in the middle. I have equations that describe how the diameter of the bulge changes with z, and also how the deviation of the centroid of the bulge changes with z.

From these equations I have drawn 240 circles parallel to each other in the z-dir that accurately describe the geometry of the problem, but what I need to do now is add a surface to the outer edge of the circles. Can someone help!? I can’t for the life of me work out how to do it!

Many thanks!

2. Also, I should have added that this pipe has a wall thickness, which varies in the "bulge" section. I again have an equation describing this variation and have drawn a set of offset circles outside of the inner circles in order to represent and inner and outer wall.

Therefore once I have my inner and outer surfaces created I need to fill them in to create the solid wall thickness region.

Unfortunately I have very limited experience of drawing in 3D, as up until now I have always been able to stay in the comfort of 2 dimensions!

I'm using AutoCAD 2004 Full Version.

3. WOW, got any images of what you are trying to do? I just can't see that one, well I have an idea but not sure if that is what you are doing.

4. I'm afraid of the number of 240, i.e 2x249 eccentric cones and then 239 differences - that means: it is possible...
Regards
Jochen

5. OK, sorry for my poor explanation. See the image below, this is of the skeleton that will make up the inner wall

As you can (hopefully) see this is the 240 circles that I need to apply a surface to the outer shape of.

6. Anyone!?

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why not try drawing a series of arcs down each line of quadrants, break each circle at each quadrant and create 956 faces using the surface edge command i will only take you until next word cup.

but seriousy i don't know. spacepig is good with polymesh as far as i can remember, he might know the answer to your question.

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