OOF2: The Manual
| OOF.Settings.Mesh_Defaults.Numerical_Differentiation | ||
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6.2.268. OOF.Settings.Mesh_Defaults Commands |  |
Name
OOF.Settings.Mesh_Defaults.Numerical_Differentiation — Set the increment used for approximate derivatives when exact derivatives are not available.
Synopsis
OOF.Settings.Mesh_Defaults.Numerical_Differentiation(epsilon)
Details
- Parent Menu: OOF.Settings.Mesh_Defaults
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Callback: function
_numericalDiffin moduleooflib.engine.IO.meshmenu -
Parameters:
epsilon- Increment for numerical differentiation Type: A real number.
Description
When solving nonlinear equations with Newton's method, OOF2 needs to know
the derivatives of some of the material Properties with respect to
the Field values. If the Properties don't provide code that
evaluates the derivatives, OOF2 can still use Newton's method by evaluating the
derivatives numerically. epsilon sets the size
of the perturbation, relative to the Field value, that is applied
to the Field values when differentiating the Property.
The default value of the relative perturbation is 10-5. An absolute perturbation less than 16 times the double precision machine epsilon will never be used.
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| OOF.Settings.Mesh_Defaults.Data_Cache_Type |  |
OOF.Settings.Mesh_Defaults.SelfConsistency |