XDMF.h file

XDMF 3 domain writer for temporal visualization output.

This file defines the IO::XDMF class, which produces XDMF 3 XML documents that reference HDF5 heavy-data files for mesh topology, geometry, and grid function attribute datasets.

The XDMF writer follows a split-file design:

One HDF5 file per mesh snapshot
One HDF5 file per grid function attribute per snapshot
One XDMF XML file referencing all HDF5 files

In distributed (MPI) mode, each rank writes its own rank-specific HDF5 visualization files using {rank} in the file patterns. Only the root rank (configurable, default 0) writes the master .xdmf XML file that references all rank-local piece files as a Spatial collection. For transient output, the master XDMF uses a Temporal collection of Spatial collections.

Typical Workflow

IO::XDMF xdmf("output/simulation");

xdmf.setMesh(mesh)
     .add("velocity", u, IO::XDMF::Center::Node)
     .add("pressure", p, IO::XDMF::Center::Node);

for (size_t step = 0; step < nSteps; ++step)
{
  // ... solve ...
  xdmf.write(time);
}

xdmf.close();  // writes the XDMF XML; also called by destructor

Namespaces

namespace Rodin: The Rodin library for finite element methods and shape optimization.
namespace Rodin::IO: Module for mesh and grid function input/output.

Classes

class Rodin::IO::XDMF: XDMF domain writer for static or transient visualization output.
struct Rodin::IO::XDMF::Keyword: XML element names used in the XDMF 3 document format.
struct Rodin::IO::XDMF::FilePatterns: File naming patterns used by the writer.
struct Rodin::IO::XDMF::GridOptions: Per-grid export options.
class Rodin::IO::XDMF::Grid: Handle to one named grid inside the XDMF domain.
struct Rodin::IO::XDMF::SnapshotRecord::PieceMeta: Per-rank mesh metadata cached during write().