99 lines
2.4 KiB
Plaintext
Executable File
99 lines
2.4 KiB
Plaintext
Executable File
.. _massage2:
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 _place_holder;
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> **_MASSAGE2_**
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>
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> **MASSAGE2** iteratively calls MASSAGE to refine adaptively according to a
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gradient field. Thus, the **bisection_length** option must be a field.
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>
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> FORMAT:
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>
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> **massage2** / file_name / min_scale / bisection_length / merge_length /
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toldamage / [tolroughness] / [ifirst,ilast,istride]/
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 _place_holder; _place_holder; _place_holder; [**nosmooth**]/[**no
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recon**][**strictmergelength**]/[**ignoremats**]/[**lite]**/[**checkaxy**]/[**
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semiexclusive**]/**[exclusive**]
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>
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>
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**file_name** is a file which contains a set of LaGriT commands that calculates the gradient field based on the distance field. In other words, the gradient field is a function of the distance field. It is necessary to have this file when using this routine, as the field must be updated after each refinement iteration.
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**_Creating user function file for MASSAGE2 routine_**
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>
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> This file contains a set of LaGriT commands which calculate the gradient
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field for refinement based on the distance field.
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>
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> A file could be written like this:
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>
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> #user_function.mlgi
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#An example of calculating the gradient field **F** as a linear function of
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the distance field **D**
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#Define some coefficients for the function
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define / COEF_A /
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define / COEF_B /
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#Formula **F** = COEF_A * **D** + COEF_B
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#First remove any distance field that exists and recompute the distance field
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cmo / DELATT / mo_sink / dfield
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compute / distance_field / mo_sink / mo_src / dfield
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#Calculate **F**
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math / multiply / mo_sink / ref_field / 1,0,0 / mo_sink / dfield / COEF_A
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math / add / mo_sink / ref_field / 1,0,0 / mo_sink / ref_field / COEF_B
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finish The user does not have to put a floor value for the gradient field in
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this case (unlike in MASSAGE), as MASSAGE2 will calculate the floor value
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automatically. However, the minimum length scale 'min_scale' must be
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specified.
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The user must also create a node-based attribute for the gradient field before
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calling MASSAGE2. In the example above, attribute 'ref_field' must already
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exist in the mesh object. The name of the field must also match the
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'field_name' argument in the MASSAGE2 command.
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**min_scale** is the minimum length scale of the mesh (the minimum desired edge length).
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See [**MASSAGE**](MASSAGE.html) for other arguments.
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>
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> EXAMPLE:
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>
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> **massage2** / user_function.mlgi / 0.1 / ref_field / 1.e-5 / 1.e-5 /
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strictmergelength
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