Application #56. Mesh Movement Strategies

Contributed by Eric Nielsen, NASA Langley

Comparison of mesh movement schemes for highly-stretched grids.

The spring analogy is a commonly-used technique and is blended here with a distance function-based rigid body motion near viscous surfaces. The scheme has failed to handle many cases in a robust manner and here an alternative grid-transparent PDE-based method by using the equations of elasticity is examined. By using a locally modified value of Poisson’s ratio, the PDE method has proven much more robust for viscous and 3D applications. It also lends itself naturally to an adjoint implementation for computing sensitivities of the movement scheme.