FlexPDE 5 allows
the definition of mesh-moving equations, and
applies an Arbitrary Lagrange/Eulerian
(ALE) formulation. This allows several
optional behaviors:
By locking the
mesh to the fluid velocity, you can create a
fully Lagrangian model.
Or, you can
define a relaxive mesh within moving boundaries
to maintain mesh integrity.
Or, by omitting
the mesh moving equations, you can perform a
fully Eulerian computation.
In any case,
FlexPDE automatically corrects the PDE system to
represent the motion of the mesh.
The problem shown
here computes the motion of a gas in a compressor
cylinder.
