Figure 10: Base flow for the cylinder test case
Cylinder-Base.xml can be found inside the $NEKTUTORIAL/Cylinder/Base folder. This is the
Nektar++ file generated using $NEK/MeshConvert and augmented with all the configuration
settings that are required. In this case, CFL conditions can be particularly restrictive and the
time step must be set around 8 × 10−4. We will be using Reynolds number Re = 42 for this
study.
The supplied file Cylinder-Base.bse is the converged base flow required for the analysis and is the result
of running Cylinder-Base.xml. To have a steady solution it was necessary to evolve the fields for a
non-dimensional time τ ≥ 300 and it is very important to be sure that the solution is steady. This can be
verified by putting several history points on the centre line of the flow and monitoring their
variation.
The base flow should look like the one in figure 10.