Is the mesh quality satisfactory and could improving the mesh in
some way help convergence?
- In particular, is the mesh able to resolve the variations of the
flow? This can affect the convergence of the solution, and also the
accuracy of the resulting solutions. Quantities to look at are the
mesh density, grading, orthogonality, smoothness, skewness and cell
- Are there large residuals in a localised area of the flow, which
may be inhibiting convergence? Local mesh refinement or mesh
adaptation might help in this circumstance.
- It can help to have the mesh aligned with the flow. This can
improve accuracy and improve convergence.