### 2.1.1. Pull-Down Menu - File - New

This menu is available only when Autodyn is started outside Workbench.

Starts the creation of a new model.

Folder

  Shows the folder where files for the model will be kept.

  Click the Browse button to select a different folder.

  Click the Folder List button to select a folder from your current list of folders or manage your folder list

Ident

  Enter an Ident for your model in this field.

  The Ident you choose is used to identify all the files created for your model.

  For example, If your Ident is MyImpactProblem, then the cycles zero Save file for the problem will be named MyImpactProblem_0.ad.

Heading

  Enter a heading for your model in this field.

  Headings appear in plots and other output for your model.

Description

  Enter a more detailed description of your model here if you want.

Symmetry

  Select the dimension (2D or 3D) and symmetry you want to use for your model.

  - In 2D you must choose either Axial or Planar symmetry

  - In 3D you do not need to choose a symmetry, but you can optionally select X, Y and/or Z symmetry.

    (For example, if you select X symmetry, then the plane X=0 is assumed to be a symmetry plane).

Units

  Select the units of length, mass and time you want to use for your model.

  The default units (mm, mg, ms) will give good results, with small rounding errors, for most models.

US Customary Units

  US customary units have been added to units options when creating a new model.

  These are:

  - Length unit (inch or foot)

  - Mass unit (pound)

  These units can be written in short as "in", "ft", and "lb". One of the three time units can be used in conjunction with the US customary units: microsecond, millisecond, or second.

  Note they cannot be used together with Metric Units. For example, you cannot use inch for length unit and kilogram for the mass unit.

  The following table shows the unit for each type of physical variables in the US customary system.

| in, lb, s | in, lb, ms | in, lb, μs | ft, lb, s | ft, lb, ms | ft, lb, μs
--- | --- | --- | --- | --- | --- | ---
Length | in | in | in | ft | ft | ft
Mass | lb | lb | lb | lb | lb | lb
Time | s | ms | μs | s | ms | μs
Temperature | K | K | K | K | K | K
Density | lb.s2/in4 | lb.ms2/in4 | lb.μs2/in4 | lb.s2/ft4 | lb.ms2/ft4 | lb.μs2/ft4
Inertia | lb.s2.in | lb.ms2.in | lb.μs2.in | lb.s2.ft | lb.ms2.ft | lb.μs2.ft
Volume | in3 | in3 | in3 | ft3 | ft3 | ft3
Force | lb | lb | lb | lb | lb | lb
Pressure | psi | psi | psi | psf | psf | psf
Impulse | lb.s | lb.ms | lb.μs | lb.s | lb.ms | lb.μs
Velocity | in/s | in/ms | in/μs | ft/s | ft/ms | ft/μs
Work | lb.in | lb.in | lb.in | lb.ft | lb.ft | lb.ft
Strain Rate | 1/s | 1/ms | 1/μs | 1/s | 1/ms | 1/μs
Energy | lb.in | lb.in | lb.in | lb.ft | lb.ft | lb.ft
Energy/Unit Mass | in2/s2 | in2/ms2 | in2/μs2 | ft2/s2 | ft2/ms2 | ft2/μs2
Energy/Unit Volume | lb/in2 | lb/in2 | lb/in2 | lb/ft2 | lb/ft2 | lb/ft2
Fracture Energy | lb.s | lb.ms | lb.μs | lb.s | lb.ms | lb.μs
Fracture Toughness Squared | lb2/in2 | lb2/in2 | lb2/in2 | lb2/ft2 | lb2/ft2 | lb2/ft2
Specific Head Capacity | in2/s2.K | in2/ms2.K | in2/μs2.K | ft2/s2.K | ft2/ms2.K | ft2/μs2.K
Thermal Conductivity | lb.s/K | lb.ms/K | lb.μs/K | lb.s/K | lb.ms/K | lb.μs/K

Micron Unit System

  A new micron (μm) length system has been introduced. This can be used in conjunction with a mass unit of picogram (pg) and time unit of microsecond or millisecond.

Release 18.2 - © ANSYS, Inc. All rights reserved.