Nek5000 code is designed to simulate

Nek5000 is written in f77 and C. It uses MPI for message passing
(but can be compiled without MPI for serial applications)
and some LAPACK routines for eigenvalue computations (depending on
the particular solver employed). In addition, it can be optionally
coupled with MOAB, which provides an interface to meshes generated with
CUBIT. Nek5000 output formats can be read by the parallel visualization
package VisIt developed at LLNL/LBNL.
VisIt is mandatory for large problems (e.g., more than 100,000
spectral elements).

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