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BDDC: cellwise subdomains, matfree MatIS, and user-defined primal vertices #4757

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BDDC: cellwise subdomains, matfree MatIS, and user-defined primal vertices #4757

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@pbrubeck pbrubeck commented Nov 28, 2025 •
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Description

This PR adds new features for BDDC.

  1. The solver option -bddc_cellwise enables cellwise subdomains.
  2. The solver option -bddc_matfree enables a matfree MatIS to be used for the interior solver.
  3. User-defined coarse degrees of freedom can be specified through appctx["primal_markers"].

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@pbrubeck