hmnast

hmnast translates Nastran ASCII punch files into HyperMesh binary results files. hmnast can be executed either independently or directly from HyperMesh.

To run hmnast independently, use the following syntax:

hmnast [arguments] <inputfile> <outputfile>

where [arguments] are optional arguments. Arguments such as displacements, stresses and strains are on by default. To obtain these arguments, use the command hmnast -u.

To run hmnast from Hypermesh:

1.	Select solver on the BCs page.

2.	Click the translator toggle and select hmnast.

3.	Click input file = and select the punch file.

4.	Click output file = and select the output file location and name.

5.	Enter the options. To create an H3D file for a specific result, add –h3d after the first option. For example, to create an H3D file of the displacement, the option should be: -d –h3d

6.	Click solve.

The following options are off by default:

Flag	Meaning
-m	Displacements and maximums
-minimums	Minimums instead of maximums
-iter	Nonlinear iterations (from SOL 106)
-trans	Transient thermal
-corner	Corner stresses (for CQUAD4 and solid elements)
-bulk	Reads element connectivity from the bulk file (for use with the corner option)
-noconv	Do not convert local displacements into global coordinates
-nolabels	Do not use subcase labels
-title	Use title for simulation name
-subtitle	Use subtitle for simulation name
-disk	Translation is performed on disk
-size	Number of entities (10000 = default)
-file	Scratch file name
-csa	Translates CSA/Nastran
-1Dforce	Reads all forces for 1-D elements
-1Dstress	Reads all stresses for 1-D elements
-2Dforce	Reads all forces for 2-D elements
-repR	Replaces R/NaN/nan fields with 0.0 (found in strain energy data types)
-h3d	Outputs file to an H3D file instead of an hmresults file. The hmresult file includes translated model and results information. The punch file must contain geometry for it to be output to an H3D file. If there is no geometry in the punch file, use –bulk <filename> in addition to –h3d. Example: hmnast -h3d -bulk myFile.dat myFile.pch myFile.h3d H3D files can be created either by using hmnast or from HyperMesh.

hmnast supports the following data types:

•	Displacements, rotations, velocities, and accelerations

•	SPC forces and SPC moments

•	Grid Point Force Balance (totals block only)

•	Real element forces Element name codes: 1, 2, 10, 11, 12, 33, 34, 74, 100

•	Real stresses Element name codes: 1, 2, 4, 10, 33, 34, 39, 64, 67, 68, 70, 74, 75, 82, 85, 88, 90, 91, 93, 144

•	Real strains Element name codes: 4, 33, 39, 64, 67, 68, 70, 74, 75, 82, 85, 88, 90, 91, 93, 144

•	Complex stresses Element name codes: 33, 39, 64, 67, 68, 70, 74, 75, 82

•	Complex strains Element name codes: 33, 39, 64, 67, 68, 70, 74, 75, 82

•	Temperatures

•

Flux

•	Strain energies

•

Time

•	Eigenvectors

•

Frequency

Notes:

•	To extract displacements and maximum von Mises stresses from the punch file, use the option -d -von_max.

•	To extract only the maximum values of the data types, specify the option -m.

•	For iterative solutions encountered in SOL 106, use the option -iter.

•	For transient solutions encountered in SOL 159, use the option -trans.

•	For nonlinear transient solutions encountered in SOL 129, use the options -trans -iter.

•	Corner stresses:

Use -corner option when STRESS(CORNER) or STRESS(BILIN) is used in the data file.

When using -corner option, hmnast requires the bulk data information. This can be done by using ECHO=PUNCH during analysis. Otherwise, use the -bulk <bulkfilename> option.

When using STRESS(CORNER), Nastran gives corner stresses on a per-element basis. However, hmnast averages the corner stresses at the nodes for adjacent elements.

•	HyperMesh converts the nodal displacements into global coordinates if there are non-zero values in the CD field of the GRID cards. To display the results in HyperMesh as they are reported in the punch file, use the option -noconv

•	Simulation names:

hmnast organizes the punch file results into a series of simulation names and data types. The simulation names correspond to the LABEL card of the punch file for SOL101. To create a simulation name, the first 27 characters from the LABEL card are appended with the SUBCASE ID. The corresponding data types are Displacements, von Mises Stress, and so on. If the option -nolabels is selected, the simulation name corresponds to the SUBCASE ID number.

Use -title to use the TITLE card of your punch file as the simulation name.

Use -subtitle to use the SUBTITLE card of your punch file as the simulation name.

The simulation name for SOL106 is SUBCASE # Iter #.

For modal frequency response problems, the simulation name is Mode # f #Hz.

For modal frequency response problems where the complex part of the eigenvalue is used (SOL 107 and SOL 110), the simulation name is Mode # f #Hz(c).

For direct frequency response, the simulation name is Subcase # f #.

For transient problems (SOL159, SOL129), the simulation name is Time #.

Do not use -nolabels for SOL106, SOL159, and SOL129.

•	If the size of the punch file is too large, use the option -disk -size n -file /temp/scratch.tmp, where n corresponds to the maximum number of nodes/elements in the model and scratch.tmp is the scratch file name that hmnast creates in the /tmp/ directory.

•	hmnast supports punch files for the following solutions:

SOL 101, 103, 105, 106, 107, 108, 109, 110, 111, 112, 129, 153 and 159

Both SORT1 and SORT2 formats are supported.

•

To extract only selected nodes from a punch file, use the option -selmodes <selmodesfile>, where selmodesfile contains the mode numbers that need to be extracted. These numbers must have spaces separating them. Any number of lines can be entered. A line cannot exceed 256 characters. To extract only a selected number of subcases, use the option -selsubc <selsubcfile>.

How do I...

Post-process Nastran results in HyperMesh

Create an h3d file from HyperMesh

hmnast

hmnast

hmnast

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