Meshing and CFD Accuracy - ICM

Impact of Mesh Quality (1)
• Quality measures
– Skewness
– Change in cell-size (growth rate)
– Aspect ratio
– Alignment with the flow
• Impact on convergence
– Highly skewed cells harm convergence, often leading to
solution divergence due to large source terms.
– Quite frequently, solution diverges because of just a few
problematic cells.
– Highly stretched cells make the equations stiff, delaying
convergence considerably.
13