Nastran Format - Family Names.

[zampa]

Hi.

I am working on a 3D mesher. As output, I want to use the NASTRAN format.

For this, I have two questions:

1. How do I include family names to my mesh? For example, I write a mesh with Hexa8 elements, and want to specify the inlet/outlet/... I do this using Quad4 elemnts, referenced to a ID, for example:

CQUAD4 0053308 0000033 0047394 0047640 0047646 0047400

is shell 0053308 referenced to ID 0000033.

How can I give this ID a name, for example Inlet.

Now I only specify:

PSOLID 0000001 0000003 0000011 0000001 (for the volumen)
PSHELL 0043761 0000004 0000011 0000001 (for surface shells).

2. How do I increase my accuracy? I can only write coordinates using 8 digits. Is this rigth?

$---1--|---2---|---3---|---4---|---5---|---6---|---7---|---8---|---9---|--10---|
GRID 0000001 0.000 0.000 16.500

Thank you,
Zampa.

 

[johnhors]

1. I don't think you can do this. But you can specify element sets.

2. you change the number of columns from 8 to 16 by using the * format,
for example:-

GRID*
PSOLID*
PSHELL*

Items in fields 2 to 9 occupy 16 columns. Line length must not exceed 80 columns so you have to use continuations.

Otherwise there is also a free-format option, but most if not all pre-processors using the 8 or 16 column formatted version of the bdf.

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quality, cost effective FEA solutions

 

[zampa]

Thank you johnhors.

So, you mean by using the * after the keyword GRID y can use fields with 16 columns... Great! I will try it.


Concerning the first question: there must be a way to define a family name, string, or something like that...