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Old   June 8, 2001, 12:20
Default Geometry of straight pipe
  #1
TUM
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Hello I have problems about how to create the straight pipe with slope 1.19 degree. I do not understand about the axis that i must input the coordinate in the axis block. Please suggest the way to create this model. I just study CFX-5 for one week. Thank you
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Old   June 10, 2001, 12:37
Default Re: Geometry of straight pipe
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Dan Williams
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If I had to do this I'd create a circle, rotate it by 1.19 degrees, and then extrude the circle the desired length along a direction vector which gives you a 1.19 degree slope.

Maybe you tried this already?

Dan.
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Old   July 16, 2001, 06:36
Default Re: Geometry of straight pipe
  #3
aoyi
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Hi,

I have a similar problem like that of TUM. Dan suggests that you create a circle and extrude. How do you do this???

I can only extrude a surface. Further, I am unable to create surface edges from a circle because, by defualt the surace should have at least 3 edges from 3 curves.

All i did was to rotate a point on XY plane 4 times in oder to create a circle(according to example 2 of Build). This worked but is there a shorter method?

aoyi

aon a circle beneed to re
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Old   July 16, 2001, 07:32
Default Re: Geometry of straight pipe
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janyatoyo
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Hi,

how do you extrude a circle?

janyatoto
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Old   July 16, 2001, 22:15
Default Re: Geometry of straight pipe
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Dan Williams
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You can create a curve which is a circle by simply rotating a point about a center. I think it's under Create->Curve->Revolve.

After that you need to rotate the circle by the desired angle. Transform->Rotate (or something like that), then create a surface by extruding along a direction vector. I think it's under Create->Surface->Extrude.

You'll need to add end surfaces to enclose the geometry so that you can make a b-rep. I'd just use trimmed surfaces for these.

Also, be careful if you are using CFX-5 before version 5.4. Before that the surface mesher could not mesh periodic (closed) surfaces. If that's the case then you'll need to split the original circle into two pieces.

Dan.
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Old   July 17, 2001, 08:09
Default Re: Geometry of straight pipe
  #6
aoyi
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Hi Dan,

Thanks for responding. For you to create a surface in cfx4.3,(Build) by default you need at least 3 edges, as i said earlier. It was not clear from your contribution how one can do this from a CIRCLE. tHAT IS IF YOU DO NOT STEP BY STEP rotate a point the create curve...revolve thing.

Under which menu option (in cfx4.3 build) do you add end surfaces?
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Old   July 18, 2001, 12:12
Default Re: Geometry of straight pipe
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tum
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i have been already to create circle>revolve... After that i exclude the surface of that circle to be the straight. Thank you
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Old   July 18, 2001, 21:33
Default Re: Geometry of straight pipe
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Dan Williams
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Sorry, I've never done this in CFX-4, so I'm not sure what the procedure would be. The original post was regarding CFX-5.

Dan.
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