Super_element_control
Contents
Data Structure: Super_element_control |
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Description |
Group data for reduced order |
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Super_element_control NUM=ival where ival is the data structure number |
Description |
Overview The super element approach allows to reduce the degrees of freedom of a system by substituting regions of the model domain mesh by single super elements that describe the behavior of that region of the domain. In other words it allows to replace many finite elements into a single super element which response is identical to the response obtained by the original mesh discretization. This reduces the number of equations to be solved and hence the memory required to solve a problem which can be advantageous when using an implicit solver. To do the super element substitution a partial solve needs to be performed in the regions to be substituted by super elements and hence given the CPU time required to perform such operation this approach is only advantageous if numerous simulations need to be undertaken (e.g. boundary conditions optimization, sensitivity analyses, etc.). It should be noted that the super element substitution is performed only in regions of the model which are not of primary interest for the present application whereas regions of the model that are of interest are kept discretized with the original finite element mesh (e.g. if the region of interest is a reservoir, the super element approach may be used to reduce the number of elements in the under-burden, overburden and side burden).
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 | Directory Output directory for superelement file |
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Output directory for the generated super element file (default to directory containing data file) (Max Characters 256)
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| File_name Name of generated superelement file |
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Name of generated super element file defined without an extension. (Max Characters 60) The format of the file can be either HDF or ASCII using standard ParaGeo ASCII keywords and is defined using File_format keyword.
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| File_format Format of the geometry file |
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The format of the file can be either: • "hdf" - HDF format (default) • "ASCII" - ASCII using standard ParaGeo ASCII keywords
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| Solution_type Type of solution to be performed |
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Type of operation to be performed in the current simulation. Valid values are: • "Create" - Create and write the super element to the file defined using File_name keyword and exit • "Use" - Read the super element file previously defined as File_name, and perform a simulation using the super element • "Reflate" - Reflate the super element to provide results for the complete mesh
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| Retained_groups List of retained groups |
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List of groups to be retained; i.e. retained in the model and not to be included in the super element
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| Retained_geometry_sets List of retained geometry sets |
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List of geometry sets to be retained. When specified all nodes corresponding to the geometry sets will be retained in the model; i.e. excluded from the super element
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| Retained_history_sets List of retained history sets |
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List of history sets to be retained. When specified all nodes corresponding to elements required to compute the history set variables will be retained in the model; i.e. excluded from the super element. Generally at least one element will be retained for each history point, with more elements/history point if average element output is specified In the history data
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| Retained_contact_sets List of retained contact sets |
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List of contact sets to be retained. When specified all nodes corresponding to the contact sets will be retained in the model; i.e. excluded from the super element
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| Retained_couple_freedoms List of retained couple freedoms |
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List of couple freedoms to be retained. When specified all master nodes the couple freedom sets will be retained in the model; i.e. excluded from the super element
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| Zero_value_inclusion_factor Zero value inclusion factor |
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In order to exclude insignificant entries from the stiffness, only entries satisfying ABS(Value) > Tol are admitted, where Tol = (Value of minimal diagonal entry) x Zero_value_inclusion_factor. The default value of Zero_value_inclusion_factor =1E-14
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| Output_level Defines output to the log file for the conversion process |
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Defines output to the log file for the conversion process. Valid output levels are: • 0 - No output data • 1 - Summary data (Default) • 2 - Detailed information
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| Solver_optimisation_flag Reduces solver time for Inverse modelling where multiple simulations are performed |
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Reduces solver time for Inverse modelling where multiple simulations are performed by saving solver preparation data on the first "Use" simulation for use in subsequent simulations • 0 - Do not save solver information (default) • 1 - Save solver information on first USE simulation to reduce CPU on subsequent simulations
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| Domain Domain number the super element is associated with |
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Domain number the super element is associated with: •0 - Sequential (Default) •1,2 ... - Domain based
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