Creating path lines on a curved surface

[mariadcauchi]

Hi,

I am trying to create a path line on a curved surface (meshed with
shell elements with thickness 1mm) in Ansys. I am currently selecting
the nodes defining the path I want on this curved surface. The problem
is that I am getting some discontinuties in the data I get as if Ansys
is joining straight lines between given nodes and missing the
curvature on the surface. Also the values obtained do not make sense
as in they vary a lot (maybe something to do with the shell
elements?).

Any help pls?

Thanks a lot,
Marija

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[Santhosh Kumar]

Hi Marija,

If the curvature has a constant radius, i.e part of a circle, then you can create a local CYLINDRICAL coordinate system at the CENTER of the circle such that Y(theta) axis is along the circumferential direction of the curve.  Then change the activate coordinate system to this local local coordinate system. Now you pick start and end node of the curve. It should pick all the node along the curve.

If you are not create a path in cylindrical coordinate system ( i.e if you creating it in default CSYS,0), then pick start and end point of the curve will create only the straight line path between start and end point, it will miss all the nodes along the curvature. Hence you will discontinuity.

The shape of the interpolated path geometry will follow the currently active CSYS coordinate system. Alternatively, you can specify a coordinate system for geometry interpolation (CS argument on the PPATH command).

If you not comfortable in creating local CS, then pick ALL the nodes  along the curvature in the path definition, this should also work.

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Regards
Aerosanth.