1. Principle of the test

The problem is a very simple elastic mechanical problem.

Kinematic boundary conditions are not trivial: there are relationships between several degrees of freedom.

The reference calculation is obtained with solver MUMPS and using ELIM_LAGR =” NON “(default).

We do the same calculation with ELIM_LAGR =” OUI “and we check that we get the same result.

The method for eliminating the Lagrange equations is described in [R5.03.05]

The validation is complete:

• We check that the method works for the solvers: MUMPS, LDLT and PETSC

• We check that the method works with non-homogeneous linear relationships

• We check that the solution is well reconstituted on all degrees of freedom, including the Lagrange degrees of freedom (use of the STAT_NON_LINE command).

• We check that the method works on several processors (C and D models)