by HM Ngo EDF / DPN / UTO and T. De Soza, EDF R&D / AMA
This simulation represents a roll-expanded tube in a hemispherical bottom, subjected to pressure loading. The model is fairly large : 750.000 degrees of freedom with a quadratic mesh. It has two major nonlinearities :
The computation time is mainly related to the linear systems solving, it is crucial to reduce the cost of this phase.
In version 10, with some care in the setting of the direct solver MUMPS, the calculation requires about 23 GB of memory and does not even converge in more than 12 hours.
In version 11, three recent advances in Code_Aster can be used to advantage :
This calculation was at the limit of feasibility with the version 10. In the end, it runs with the version 11 in 35 minutes on 64 processors with a global required memory less than 15 Go.