No, with 7 or 4 gauss points on a guadratic (6 nodes) triangle, you will see the result as 'coloured spheres' on your gauss point locations,
and some options, like smooth contour fill won't be available, because there is not implemented the extrapolation from results on your gauss points to the element nodes.
We usually use the 'shape functions' of the element to do this extrapolation to nodes: this require the same amount of nodes that gauss points (to have the same number of equations that unknowns).
Also the trivial case of 1 gauss point is implemented, then the constant result is extrapolated to nodes without need to solve any linear system equations.
We have not implemented a more general extrapolation mode, for a generic amount of gauss points in arbitrary locations.
But as I've explained, you can do you own extrapolation from your calculated gauss points, to our 'internal' gauss points (6 gauss points for the quatratic triangle), or better write as a 'nodal result' instead of a elemental gauss-point result, averaging as you want the results on nodes belonging to several triangles.
Enrique
----- Original Message -----
From: Nunzio Losacco
To:
gidlist at listas.cimne.upc.edu
Sent: Thursday, December 06, 2012 1:01 PM
Subject: Re: [GiDlist] non-standard number of gauss points
Hi Enrique,
thanks for your reply.
I'm not sure I understood well. If I have results at, say, 7 or 4 gauss points, will I be able, following directions of the Customization manual, to visualize results as continuous fields over elements (or over the whole domain using the "smooth" results option)?
Thanks again,
N.
Il giorno 03/dic/2012 15:34, "Enrique Escolano"
escolano at cimne.upc.edu ha scritto:
6-nodes quadratic triangles are useful in GiD, and for this element our default number of gauss point is also 6 (then we can extrapolate results from gauss points to nodes using the element shape funcions, solving a 6x6 linear equation system)
For other number of gauss points, e.g. 4 we can't extrapolate results to nodes, and some features become unavailable, and we represent the results as spheres located on the described gauss points location.
See GiD help on GiD Customization-POSTPROCESS DATA FILES-Postprocess results format: ProjectName.post.res-Gauss Points
to know how are defined our 'internal' gauss points. If your solver uses a different location, you must describe it in the definition of gauss points of your results file.
Although your solver uses other gauss points, for results visualization pourposes you can write the results file using our internal definition, or also using a different number of gauss points, or better avoiding gauss points results and writting the resuls as nodal ones (averaging the nodal result to have a continuous field)
Enrique Escolano
----- Original Message -----
From: Nunzio Losacco
To:
gidlist at listas.cimne.upc.edu
Sent: Monday, December 03, 2012 3:07 PM
Subject: [GiDlist] non-standard number of gauss points
Hi all,
the software I'm working with uses 6 noded triangular elements with an odd number of integration points (i.e. either 4 or 6). GiD seems not to be able to take this into account; is there a way to teach GiD to consider that number of gauss points with their position?
Regards,
N.
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