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The mbtempest tool exposes the algorithms and interfaces to invoke TempestRemap through MOAB to generate remapping weights for combinations of discretizations and unstructured meshes defined on a source grid to a target grid. Most of the options supported by TempestRemap tools are provided in this unified interface with one key difference: the entire workflow makes use of MPI parallelism. This implies that the overlap mesh computation that would normally use the GenerateOverlapMesh tool in TempestRemap would be replaced by the MOAB's parallel implementation of an advancing front intersection computation. This intersection mesh can subsequently be written out to file as an intermediate step or used by mbtempest to generate the remapping weights needed to project a solution field from source to target component grid. Prescriptions to preserve conservation of scalar/flux data and to impose monotonicity constraints are also available as options to pass to the mbtempest tool.
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[bash]> tools/mbtempest -h
Usage: mbtempest --help | [options]
Options:
-h [--help] : Show full help text
-t [--type] <int> : Type of mesh (default=CS; Choose from [CS=0, RLL=1, ICO=2, OVERLAP_FILES=3, OVERLAP_MEMORY=4, OVERLAP_MOAB=5])
-r [--res] <int> : Resolution of the mesh (default=5)
-d [--dual] : Output the dual of the mesh (generally relevant only for ICO mesh)
-w [--weights] : Compute and output the weights using the overlap mesh (generally relevant only for OVERLAP mesh)
-c [--noconserve] : Do not apply conservation to the resultant weights (relevant only when computing weights)
-v [--volumetric] : Apply a volumetric projection to compute the weights (relevant only when computing weights)
-n [--monotonic] <int>: Ensure monotonicity in the weight generation
-l [--load] <arg> : Input mesh filenames (a source and target mesh)
-o [--order] <int>: Discretization orders for the source and target solution fields
-m [--method] <arg>: Discretization method for the source and target solution fields
-g [--global_id] <arg>: Tag name that contains the global DoF IDs for source and target solution fields
-f [--file] <arg> : Output remapping weights filename
-i [--intx] <arg> : Output TempestRemap intersection mesh filename |
The mbtempest tool can be used to generate CS (cubed-sphere), RLL (lat/lon), ICO (triangular) and polygonal (MPAS-like) meshes through appropriate invocation with the -t [--type] argument in combination with -r [--res] option. Some examples for these are provided below.
Cubed-Sphere meshes
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[bash]> tools/mbtempest -t 0 -r 120 -f outputCSMesh.exo
Creating TempestRemap Mesh object ...
=========================================================
..Generating mesh with resolution [120]
..Writing mesh to file [outputCSMesh.exo]
Nodes per element
..Block 1 (4 nodes): 86400
..Mesh generator exited successfully
=========================================================
[LOG] Time taken to create Tempest mesh: max = 0.0571213, avg = 0.0571213
[bash]> tools/mbsize outputCSMesh.exo
File outputCSMesh.exo:
type count total minimum average rms maximum std.dev.
------- ------ ------- ---------------------------------- ---------------------------------- ---------------------------------- ---------------------------------- ----------------------------------
Quad 86400 13 0.00012195 0.00014544 0.00014602 0.00017133 1.3029e-05
1D Side 345600 4.2e+03 0.0092562 0.01218 0.012217 0.01309 0.00094931
Vertex 86402
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