Arbitrary Lagrange/Eulerian moving mesh*

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.

Animate

Mesh

Gas Pressure

Gas Density

Gas Motion

(All animations are FlexPDE native graphical output, assembled into a movie by AnimationShop)

View the problem script

*Note: FlexPDE 5.0 does not support slip surfaces.

Gas Pressure
Use Table at left
to animate display