94 lines
3.3 KiB
Markdown
94 lines
3.3 KiB
Markdown
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# Add Node attribute voronoi volume
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For a tet or tri mesh, an attribute can be added for each node giving the voronoi volume.
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This uses the same routine used to calculate voronoi volumes for the FEHM stor file.
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The commands for 3D tet and 2D tri are slightly different.
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## 2D Voronoi area node attribute
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We do not have a voronoi area option for 2D except as represented each of the x y z components for the Voronoi areas formed by the nodes. As long your surface is planar, you will get the values you want.
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That is if your surface has normal in z direction, the z component will be your voronoi area.
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In this example we create the attributes xvarea, yvarea, zvarea and write a truncated AVS file
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which writes only node attributes. The file can be written for all nodes, or just a selected set.
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After reading the tri surface into a mesh object named *mo_tri*:
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```
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# add attribute to save node id as attribute
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# this is important if you subset or re-order nodes
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cmo/set_id/mo_tri/ node / id_node
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# create 3 attributes with voronoi areas
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cmo/addatt/mo_tri/ voronoi_varea / xvarea yvarea zvarea
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# display the min and max values of attributes
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cmo printatt mo_tri -all- minmax
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# turn off extra attributes for writing
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cmo/modatt/mo_tri/ itp / ioflag / l
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cmo/modatt/mo_tri/ isn / ioflag / l
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cmo/modatt/mo_tri/ icr / ioflag / l
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# write node attributes with avs flag
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dump/avs/node_values.dat/ mo_tri 0 0 1 0
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# find nodes along well and subset to the well nodes
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# we copy nodes to new cmo to remove connectivity
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cmo/create/motmp
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copypts/motmp/mo_tri
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cmo/select/motmp
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pset/pwell/attribute imt/1,0,0/ eq 4
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pset/pdel/ not pwell
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rmpoint/pset,get,pdel
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rmpoint compress
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dump/avs/node_well_values.dat/ motmp 0 0 1 0
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finish
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```
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The output AVS attribute file will look similar to this with attribute names first,
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and the attribute values for rest of file. In this example
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the triangle surface is xz, so voronoi areas are in yvarea attribute.
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If you have a planar mesh, only one component of the xvarea, yvarea, zvarea will be non-zero. You can turn off all the attributes you don’t want so that when you write out the AVS attributes file it will just be a single column of floating point values, or perhaps more useful would be a file with two columns of output where column 1 would be the integer vertex id number and the second column would be the floating point area.
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node_well_values.dat
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<pre class="lg-output">
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0 0 5 0 0
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00005 1 1 1 1 1
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imt1, integer
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id_node, integer
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xvarea, real
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yvarea, real
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zvarea, real
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1 4 182 0.000000000000E+00 -0.100000000000E+05 0.000000000000E+00
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2 4 210 0.000000000000E+00 -0.100000000000E+05 0.000000000000E+00
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3 4 238 0.000000000000E+00 -0.100000000000E+05 0.000000000000E+00
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4 4 266 0.000000000000E+00 -0.100000000000E+05 0.000000000000E+00
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</pre>
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## 3D Voronoi volume node attribute
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The following will create a node attribute with the voronoi volume for each tet node.
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The mesh object name is *cmotet* and the added attribute name is *vorvol*.
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```
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quality
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cmo/addatt/cmotet/vor_volume/vorvol
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cmo/printatt/cmotet/vovol/minmax
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# select set of points by imt and sum voronoi volume
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cmo setatt cmotet vol_tot 0.
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pset/p1/attribute imt/1,0,0/ eq MATNO
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math/sum/cmotet/vol_tot/pset,get,p1/cmotet/vorvol
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pset/p1/delete
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```
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