158 lines
10 KiB
Markdown
158 lines
10 KiB
Markdown
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<!-- Begin breadcrumb -->
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<ul class="uk-breadcrumb">
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<li><a href="{{ "/pages/tutorial/index.html" | relative_url }}">Tutorials & Examples</a></li>
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<li><span>Stratigraphic Hex Mesh Tutorial</span></li>
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</ul>
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<!-- End breadcrumb -->
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<!-- Begin image -->
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<img data-src="{{ "/pages/tutorial/stratigraphy/images/21_tet_01_fehm_voronoi.png" | relative_url }}" width="639" height="525" alt="" uk-img>
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<br/>
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<!-- End image -->
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<h2 id="dump-fehm" class="uk-h3 uk-margin-remove">10. Write FEHM Files</h2>
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Write out a series of files for the FEHM flow and transport code.
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FEHM uses the control volume finite element method (CVFE) with node materials
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and properties assigned to the mesh nodes.
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The image shows the tetrahedral mesh colored by the 6 node `imt` (materials)
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values and showing the voronoi cell edges.
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These two close-up images show the relationship between the Delaunay tet mesh
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edges and the voronoi volumes, the latter of which are used by FEHM.
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The mesh nodes are the vertices of the tetrahedral elements and are the center
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of each voronoi volume.
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<!-- Lightbox -->
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<div class="uk-child-width-1-2@m" uk-grid uk-lightbox="animation: slide">
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<div>
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<a class="uk-inline" href="{{ "/pages/tutorial/stratigraphy/images/21_tet_01_fehm_tet_a.png" | relative_url }}" data-caption="Close-up view of mesh with Delaunay tetrahedral cells">
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<img src="{{ "/pages/tutorial/stratigraphy/images/21_tet_01_fehm_tet_a.png" | relative_url }}" alt="">
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</a>
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</div>
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<div>
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<a class="uk-inline" href="{{ "/pages/tutorial/stratigraphy/images/21_tet_01_fehm_vor_a.png" | relative_url }}" data-caption="Close-up view of mesh with Voronoi cells">
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<img src="{{ "/pages/tutorial/stratigraphy/images/21_tet_01_fehm_vor_a.png" | relative_url }}" alt="">
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</a>
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</div>
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</div>
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We prepare the tet mesh for FEHM with the following commands. These ensure
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that there are no duplicate nodes and sets the elements to a single material.
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We also make sure nodes are not doubly defined and parent-child chains are
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removed.
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```
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cmo/select/motet
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resetpts/parent
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filter/1,0,0
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rmpoint/compress
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```
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LaGriT can write a full set of FEHM model files with a single command.
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The `keepatt` option will save attributes tagging nodes on the outside boundaries.
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These can be used to define additional point sets and zones for FEHM.
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The following files are written:
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* `.fehm` - mesh coordinates and geometry
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* `_material.zone` - node imt (material) zone lists
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* `_outside.zone` - node external boundary zone lists
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* `_outside_vor.area` - node external boundary area lists
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* `_interface.zone` - zone lists for nodes along material interfaces
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* `_multi_mat.zone` - lists of node pairs connected across material interfaces
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* `.stor` - FEHM format file giving the voronoi (control volume) associated with each node and the sparce matrix structure
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```
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dump / fehm / mesh / motet / keepatt
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```
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Review the report written to the screen and the output file (`lagrit.out`) for
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mesh quantities.
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These are usful summaries and will help in finding problems in the mesh design.
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Check that material node counts are as expected.
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```
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*** Write FEHMN GEOM AND ZONE FILES ***
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*********dump_material_lists********
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Minimum material ID value = 1
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Maximum material ID value = 6
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Total possible materials = 6
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Material 1 has 23944 nodes. #nodes/nnodes is 0.207223027945
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Material 2 has 6867 nodes. #nodes/nnodes is 0.594303607941E-01
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Material 3 has 16072 nodes. #nodes/nnodes is 0.139094918966
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Material 4 has 33192 nodes. #nodes/nnodes is 0.287259727716
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Material 5 has 12871 nodes. #nodes/nnodes is 0.111391901970
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Material 6 has 22601 nodes. #nodes/nnodes is 0.195600062609
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```
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Check that the Sparse Matrix volumes are positive.
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Negative coefficient values can result from poorly formed tetrahedra.
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These usually occur on non-convex boundaries.
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FEHM will still run but accuracy may be impacted.
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```
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*** Construct and Compress Sparse Matrix:3D ***
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*** Compress Area Coefficient Values ***
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AMatbld3d_stor: Matrix compress_eps: 0.1000000E-07
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AMatbld3d_stor: Local epsilon: 0.1000000E-14
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AMatbld3d_stor: *****Zero Negative Coefficients ******
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AMatbld3d_stor: Number of 'zero' (< compress_eps) coefs 0
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AMatbld3d_stor: npoints = 115547 ncoefs = 964637
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AMatbld3d_stor: Number of unique coefs = 313
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AMatbld3d_stor: Maximum num. connections to a node = 25
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AMatbld3d_stor: Volume min = 7.4999999E+02
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AMatbld3d_stor: Volume max = 7.6800000E+05
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AMatbld3d_stor: Total Volume: 2.3846400E+10
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AMatbld3d_stor: abs(Aij/xij) min = 0.0000000E+00
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AMatbld3d_stor: abs(Aij/xij) max = 1.3500000E+02
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AMatbld3d_stor: (Aij/xij) max = 0.0000000E+00
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AMatbld3d_stor: (Aij/xij) min = -1.3500000E+02
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AMatbld3d_stor Matrix coefficient values stored as scalar area/distance
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AMatbld3d_stor Matrix compression used for graph and coefficient values
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ascii STOR file written with name mesh.stor
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```
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Visually inspect the mesh for the assignment of boundary zones such as top nodes.
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<!-- Lightbox -->
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<div class="uk-child-width-1-2@m" uk-grid uk-lightbox="animation: slide">
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<div>
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<a class="uk-inline" href="{{ "/pages/tutorial/stratigraphy/images/21_tet_01_fehm_node_zone_top.png" | relative_url }}" data-caption="GMV visualization of mesh nodes, with top nodes colored red">
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<img src="{{ "/pages/tutorial/stratigraphy/images/21_tet_01_fehm_node_zone_top.png" | relative_url }}" alt="">
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</a>
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</div>
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</div>
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<ul class="uk-pagination">
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<li><a href="{{ "/pages/tutorial/stratigraphy/step_09.html" | relative_url }}"><span class="uk-margin-small-right" uk-pagination-previous></span> Previous</a></li>
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<li class="uk-margin-auto-left"><a href="{{ "/pages/tutorial/stratigraphy/step_10_exo.html" | relative_url }}">Next <span class="uk-margin-small-left" uk-pagination-next></span></a></li>
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</ul>
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<!-- Sidebar -->
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<div class="tm-sidebar-right uk-visible@l">
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<div uk-sticky="offset: 160" class="uk-sticky uk-active uk-sticky-fixed" style="position: fixed; top: 160px; width: 200px;">
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<ul uk-scrollspy-nav="closest: li; scroll: true; offset: 100" class="uk-nav uk-nav-default tm-nav uk-nav-parent-icon">
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/index.html" | relative_url }}">Index</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_01.html" | relative_url }}">1. Building a Hex Mesh</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_02.html" | relative_url }}">2. Define Boundaries Using Point Sets</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_03.html" | relative_url }}">3. Constructing Stratigraphy</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_04.html" | relative_url }}">4. Map Surfaces to Mesh</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_05.html" | relative_url }}">5. Constructing a Fault</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_06.html" | relative_url }}">6. Truncate with Polyline</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_07.html" | relative_url }}">7. Refine Fault</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_08.html" | relative_url }}">8. Insert Wells</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_09.html" | relative_url }}">9. Convert Hex Mesh to Tet</a></li>
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<li class="uk-active"><a href="#dump-fehm">10.1 Write FEHM Files</a></li>
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<li class=""><a href="{{ "/pages/tutorial/stratigraphy/step_10_exo.html" | relative_url }}">10.2 Write ExodusII Files</a></li>
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<li class="uk-nav-divider"></li>
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<!---->
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<li><a href="{{ "/pages/tutorial/stratigraphy/images/gallery.html" | relative_url }}" target="_blank"><span uk-icon="icon: image" class="uk-margin-small-right uk-icon"></span> <span class="uk-text-middle">Image Gallery</span></a></li>
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<li><a href="https://github.com/lanl/LaGriT/issues" target="_blank"><span uk-icon="icon: warning" class="uk-margin-small-right uk-icon"><svg width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg" data-svg="warning"><circle cx="10" cy="14" r="1"></circle><circle fill="none" stroke="#000" stroke-width="1.1" cx="10" cy="10" r="9"></circle><path d="M10.97,7.72 C10.85,9.54 10.56,11.29 10.56,11.29 C10.51,11.87 10.27,12 9.99,12 C9.69,12 9.49,11.87 9.43,11.29 C9.43,11.29 9.16,9.54 9.03,7.72 C8.96,6.54 9.03,6 9.03,6 C9.03,5.45 9.46,5.02 9.99,5 C10.53,5.01 10.97,5.44 10.97,6 C10.97,6 11.04,6.54 10.97,7.72 L10.97,7.72 Z"></path></svg></span> <span class="uk-text-middle">Report issue</span></a></li>
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<li><a href="mailto:lagrit-dev@lanl.gov" target="_blank"><span uk-icon="icon: commenting" class="uk-margin-small-right uk-icon"><svg width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg" data-svg="commenting"><polygon fill="none" stroke="#000" points="1.5,1.5 18.5,1.5 18.5,13.5 10.5,13.5 6.5,17.5 6.5,13.5 1.5,13.5"></polygon><circle cx="10" cy="8" r="1"></circle><circle cx="6" cy="8" r="1"></circle><circle cx="14" cy="8" r="1"></circle></svg></span> <span class="uk-text-middle">Get help</span></a></li>
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</ul>
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</div>
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</div>
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