From: Marc Fehling Date: Thu, 26 Aug 2021 00:22:53 +0000 (-0600) Subject: Identity constraints in 3D are correct. X-Git-Tag: v9.4.0-rc1~1017^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F12711%2Fhead;p=dealii.git Identity constraints in 3D are correct. Fix description of test `hp/identity_constraints_02`. --- diff --git a/tests/hp/identity_constraints_02.cc b/tests/hp/identity_constraints_02.cc index 14103e1f5b..b48b161ed2 100644 --- a/tests/hp/identity_constraints_02.cc +++ b/tests/hp/identity_constraints_02.cc @@ -21,12 +21,14 @@ // On each of the four lines on the interface between the Q2 and Q4 element, the // central dofs are identical and will be treated with constraints. // -// If the dominating element in the collection of finite elements on the central -// line does not have a central dof, the dof duplicates on the elements Q2 and -// Q4 will not be recognized with constraints. -// This is the reason why there is one identity constraint less in scenario 1 -// than in scenario 2 -- the dominating Q1 element has no dofs on lines. -// This is a bug. +// We put special emphasis on the central line. +// - In scenario 1, the central dof of the central line will be constrained +// against the vertex dofs of the Q1 element. Thus, we only have 3 identity +// constraints in total on the remaining lines of the interface between the Q2 +// and Q4 element. +// - In scenario 2, the central dof of the central line belongs to the Q2 +// element and remains unconstrained. Thus, we end up with 4 identity +// constraints. // // Scenario 1: Scenario 2: // +----+----+ +----+----+