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native_cuda_synopsis.md

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The native-cuda update introduced some major updates to the lettuce structure. Here, you find the main changes. Below, you find the steps to update your runfiles:

Changes

  1. lt.Lattice is deprecated.

The device and dtype fields moved to lt.Context. The Stencil object or class (either works) is passed to Flow.__init__.

  1. lt.Streaming is deprecated.

Streaming is now always handled as defined in lt.StandardStreaming.

  1. lt.Stencil is stored in a field of lt.Flow and D is now lower case.

So, the Dimensions can be accessed via flow.stencil.d instead of flow.units.lattice.D.

  1. Further changes:
  • lt.Collision does not neet lattice definition.
  • reporters was renamed to reporter
  • no_collision_mask now includes the boundary's identifier (important for custom flows).
  • flow.u_pu directly returns velocity field in physical units as a property. Same counts for flow.p_pu (pressure) and flow.rho_pu (density).
  • units (a lt.UnitConverter) can be called from both lt.Simulation and lt.Flow

Updating runfiles

  1. Move device and dtype declarations into lt.Context and remove all lattice declarations.
  2. Move stencil declaration to lt.Flow and add context declaration.
  3. Remove lt.Streaming initialization and occurences.
  4. Rename reporters to reporter