Troubleshooting

FAQ

Regarding the structure of some of the database files

Question:

Can anyone tell me what the columns of the SPECFEM2D boundary condition files in SPECFEM2D/DATA/ Mesh_canyon are?

    SPECFEM2D/DATA/Mesh_canyon/canyon_absorbing_surface_file
    SPECFEM2D/DATA/Mesh_canyon/canyon_free_surface_file

Answer:

canyon_absorbing_surface_file refers to parameters related to the absorbing conditions: The first number (180) is the number of absorbing elements (nelemabs in the code). Then the columns are:

the element number
the number of nodes of this element that form the absorbing surface
the first node
the second node

canyon_free_surface_file refers to the elements of the free surface (relevant for enforcing free surface condition for acoustic media): The first number (160) is the number of elements of the free surface. Then the columns are (similar to the absorbing case):

the element number
the number of nodes of this element that form the absorbing surface
the first node
the second node

Concerning the free surface description file, nodes/edges pertaining to elastic elements are discarded when the file is read (if for whatever reason it was simpler to include all the nodes/edges on one side of a studied area and that there are among them some elements that are elastic elements, only the nodes/edges of acoustic elements are kept).

These files are opened and read in meshfem2D.F90 using subroutines read_abs_surface() and read_ acoustic_surface(), which are in part_unstruct.F90

This documentation has been automatically generated by pandoc based on the User manual (LaTeX version) in folder doc/USER_MANUAL/ (Dec 20, 2023)