Fixes for BDDC#5152
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default values for options should guarantee robustness wrt H1,Hdiv and Hcurl problems
pbrubeck
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Jun 15, 2026
pbrubeck
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Jun 15, 2026
| @@ -34,9 +34,12 @@ class BDDCPC(PCBase): | |||
| the options: | |||
| - ``'bddc_cellwise'`` to set up a MatIS on cellwise subdomains if P.type == python, | |||
| - ``'bddc_matfree'`` to set up a matrix-free MatIS if A.type == python, | |||
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Can you do matrix-free MatIS? Then the divergence matrix can be passed that way, I only need the action of its local part (in MATIS sense) on a given vector
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I think we need to fix support for matfree A in BDDC
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Description
Internal fixes required for BDDCPC to work on primal elasticity problems.
Adds new options
-pc_bddc_use_divergence_matand-pc_bddc_use_discrete_gradient. Their defaults are the correct ones for the Riesz map in the de Rham complex, H(curl) needs the gradient, while H(div) needs the divergence. The H1 Riesz map does not need an extra operator. However, elasiticity problems are posed on H1, but BDDC would need to be aware of the divergence, so in this case the user must prescribe it.