Submodeling

Contents

Submodeling

Description

The sub-modeling work-flow in ParaGeo is performed through 4 steps which are summarized as:

•Step 1 - Large Scale model run: Running the large scale model from which the sub-model is going to be extracted

•Step 2 - Sub-model geometry creation: Definition of the sub-model geometry and export of the boundaries as "blank" spatial grids (no other data apart from grid coordinates)

•Step 3 - Sub-model boundary conditions extraction: The previously exported "blank" spatial grids is used to read boundary conditions for the sub-model from the large scale model so that new spatial grids containing the boundary conditions are generated.

•Step 4 - Sub-model run: Running the sub-model.

For more information about the sub-modeling workflow see Sub-modeling.

In this section therefore, special data structures required to perform Step 2 and Step 3 of the sub-modeling workflow are described.

Sub-model boundary export

Sub-model boundary conditions generation

Usage

*BOUNDARY GENERATION, NAME=Name_ID, FILE=File_name, START=Value, END=Value, INCREMENT=Value

Description

*BOUNDARY GENERATION is equivalent to ParaGeo Spatial_grid_output data structure. It is used to extract boundary conditions from the large scale model at sub-model boundaries. This will generate a new spatial grid file containing the spatial grids with the boundary conditions for all sub-model boundaries. Note that the files containing the "blank" spatial grids generated during Step 2 of sub-modeling workflow (via *BOUNDARY EXPORT) should be included into the main datafile using the data structure *INCLUDE. Note that the restart file containing the results for the Large Scale model should be read as well.

Following *BOUNDARY GENERATION keyword and its corresponding parameters a list of boundary names (Geometry_set / NSET) together with specification of variables to be extracted should be provided. The numbers for each extractable variable are:

1 - Disp_x (Displacement in X-direction)

2 - Disp_y (Displacement in Y-direction)

3 - Disp_z (Displacement in Z-direction)

4 - Pore_nod (Nodal Pore Pressure)

5 - Temp_nod (Nodal Temperature)

Compulsory Parameters
NAME	Defines a name to be added as a suffix for the generated file containing the spatial grids with sub-model boundary conditions. The complete generated file name will then be "LargeScaleModelName_Name.spat". Note that the keyword FILE may be used instead to define the complete exported file name.
FILE	If defined allows to define the complete name for the file to be generated which will contain the sub-model boundary conditions. The file name will the be "FileName.spat".
END	Defines the end time for boundary condition extraction from large scale model.

Optional Parameters
START	Defines the start time for boundary condition extraction from large scale (Default: 0.0)
INCREMENT	Defines the time increment for boundary condition extraction from large scale model. The boundary conditions (prescribed values) will be linearly interpolated between two consecutive time increments (Default: START and END time only).

Sub-Keywords

List of spatial grids defining boundaries

List of variables to defining the boundary conditions

Examples

*BOUNDARY GENERATION, NAME=Disp, FILE=Displacements, START=0.0, END=0.5, INCREMENT=0.25

*SPATIAL GRIDS

North, South, East, West

*VARIABLES

Disp_x, Disp_y

1The keywords NAME and FILE are set so that a file named Displacements.spat containing the extracted boundary conditions will be generated

2Boundary conditions will be extracted from the large scale model starting at times 0.0, 0.25 and 0.5 as indicated by keywords START, END and INCREMENT

3Displacements in X and Y directions will be extracted for North, South, East, West.