UG_IO SimSys NASTRAN 3D Grid File Type

A NASTRAN file contains a tria/quad face boundary surface grid and (optionally) a polyhedral element volume grid. See NASTRAN related documentation available from other sources for more information. The following types are supported.

    	GRID*	: grid coordinates in long format
    	GRID	: grid coordinates
    	CTRIA3	: 3-node tria surface faces
    	CQUAD4	: 4-node quad surface faces
    	CHEXA	: 8-node hexahedral elements
    	CPENTA	: 5-node pentahedral elements (node 5 equal to node 6)
    	CPENTA	: 6-node pentahedral elements
    	CTETRA	: 4-node tetrahedral elements

The optional boundary reconnection, boundary condition, initial normal spacing, and boundary-layer thickness data are supported using the following comment lines. This data is only used with boundary surface grids.

    	$Initial_Normal_Spacing #.#	: initial normal spacing
    					  one line for each surface node in
    					  sequential order
    	$BL_Thickness #.#		: BL thickness
    					  one line for each surface node in
    					  sequential order
    	$Surf_Grid_BC_Flag #		: surface grid boundary condition flag
    					  one line for each surface face in
    					  sequential order with data for surface
    					  trias listed first and then data for
    					  quads
    	$Surf_Reconnection_Flag #	: surface reconnection flag
    					  one line for each surface face in
    					  sequential order with data for surface
    					  trias listed first and then data for
    					  quads

The optional number of boundary-layer elements is supported using the following comment line. This data is only used with volume grids.

    	$Number_of_BL_Elements #	: number of BL elements

ASCII formatted is the only file format supported for NASTRAN type grid files.

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