Adaptivity_control_data
Contents
Data Structure: Adaptivity_control_data |
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Adaptive control data structure |
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Adaptivity_control_data NUM=ival where ival is the data structure number |
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Overview The Adaptivity_control_data structure identifies that adaptivity is required and allows specification of the adaptivity control data. This includes; •Error estimation frequency •Maximum number of error checks between remeshes •Mapping control data •Adaptive/non-adaptive groups •Default maximum and minimum element sizes for the remesh
Notes •Adaptivity_control_data is only specified once but may be re-specified for each control stage. •At least one Adaptivity_set_data must be specified in conjunction with Adaptivity_control_data.
Examples demonstrating the usage of Adaptivity_control_data include: •adr_*.dat |
 | Error_evaluation_frequency Number of time steps between error/remesh checks |
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The maximum number of time steps between error computation/remeshing update checks is dependent on the the rate of deformation to the time step size. Generally Error_evaluation_frequency is set in the range 250 to 1000 time steps in a transient explicit analysis, or every step in an incremental or coupled analysis; i.e. where each increment may correspond to 100 to 500 steps.
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| Remesh_type Remesh type (Optional) |
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Defines the type of remeshing option to be performed. Valid types are: • "None" - Only compute error data. • "Global" - Global remesh, where the complete domain is remeshed (Default). • "Local" - Where only elements that exceed a target error are remeshed. • "Altern" - Local remesh combined with global mesh generation.
Notes •If Remesh_type is not specified it will be set to "Global" as default.
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| Remesh_curvature_sets List of remesh curvature sets |
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Remesh curvature sets may be used to define the mesh on particular geometry entities as a function of the curvature of the geometry for that entity. They therefore allow specification of mesh refinement in the neighbourhood of geometry entities (lines in 2-D or surfaces in 3-D) that are undergoing severe shear offset or bending.
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| Remesh_sets (or List_of_remesh_sets) List of remeshing sets |
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List of remeshing sets that are to be used for adaptive mesh generation. The remeshing set data defines the error estimation and mesh density control data for either the whole domain or part of the domain.
Notes •At least one remeshing set must be defined which generally defines the default data for the complete domain.
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| Default_element_sizes Maximum and Minimum target element size |
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Default_element_sizes is used to specify the maximum and minimum element sizes for the complete domain. Generally the values can be overwritten using the size data defined in the adaptivity set data. The data comprises: •Location 1 - Maximum element size •Location 2 - Minimum element size |
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| Maximum_remesh_frequency Maximum number of remesh checked before remesh is forced |
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In some cases it may be desirable to force a remesh: e.g. to change the mesh density for a problem where the error would be too small to trigger a remesh. In this case a remesh can be forced by specifying Maximum_remesh_frequency = Ncheck, where Ncheck is the maximum number of error check operations before a remesh is forced.
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| Mapping_output_flag Flag for output of plot file for mapping check |
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Flag for requesting output of plot files for mapping check. Valid values are: • 1 - Output plot file before and after each remesh. The remesh plot files will follow the same naming convention as the standard plot files by incrementing the plot file number. • 2 - Output plot file after each remesh. The remesh plot file will follow the same naming convention as the standard plot files by incrementing the plot file number. • 3 - Output plot file before remesh. The remesh plot file will follow the same naming convention as the standard plot files by incrementing the plot file number. • 4 - Output plot file before and after each remesh to ModelName_BeforeMap.plt and ModelName_AfterMap.plt files respectively. These files will be overwritten at each remesh so only the last remesh plot files will be available. • 5 - Output plot file after each remesh to ModelName_AfterMap.plt file. This file will be overwritten at each remesh so only the last remesh plot file will be available. • 6 - Output plot file before remesh to ModelName_BeforeMap.plt file. This file will be overwritten at each remesh so only the last remesh plot file will be available.
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| Output_level Flag to indicate the amount of output to the log (.res) file |
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Flag for indicating amount of output information relative to remesh operations to the log (.res) file. Valid values are: • 0 - Minimum output (default) • 1 - Medium level output • 2 - Maximum level output
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| Global_remesh_frequency Frequency for performing an optional global remesh |
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Frequency for performing an optional global remesh if local remeshing is also used.
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| Local_maximum_iterations Maximum number of iterations during local remeshing |
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Maximum number of update iterations during each local remeshing step (Default 10).
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| Local_remesh_quality_flag Element quality control flag for local remesh |
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Flag for local remesh element quality control. Valid values are: • 0 - Do nothing (default) • 1 - Sliver element removal • 2 - Short edge element removal • 3 - Do both above
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