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Quality Meshes for Converged and Accurate CFD

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Mesh quality is where you have the largest impact on solution quality - after all, the numerical algorithms and physical models are dictated by choice of the solver. A high quality mesh increases the accuracy of the CFD solution and improves convergence relative to a poor quality mesh. Therefore, it is important for a mesher to provide tools for obtaining and improving a mesh. Some meshing software uses hundreds of unnecessary blocks as a crutch to obtain a decent mesh. Pointwise's mesh methods, on the other hand, have been honed through years of application on analyses for which accuracy, and hence mesh quality, are critical.

mesh quality assessment

The Examine command provides capabilities for computing and displaying many different mesh quality metric functions.

Mesh quality tools in Pointwise keep you in control of mesh metrics relative to your acceptance criteria. Metrics can be examined graphically in great detail down to the cell-to-cell level. Cutting planes can be used to dissect the mesh to see the interior, graphical tools can be used to zoom in on the cells with the minimum and maximum metric values, and simply pointing at a cell will display its metric value.

Mesh and Geometry Metric Functions
Jacobian Smoothness I
Volume Smoothness J
Component Volume Smoothness K
Area Minimum Included Angle
Length Maximum Included Angle
Length I Equiangle Skewness
Length J Equiarea Skewness
Length K Equivolume Skewness
Volume Ratio Centroid Skewness
Area Ratio Wall Spacing
Length I Ratio Wall Orthogonality
Length J Ratio Database Associativity
Length K Ratio Boundary Proximity
Aspect Ratio Surface Proximity

Monitor Quality Proactively Using Rules

Rules can be applied to proactively monitor the mesh quality. You define the acceptable values of any metric function (for example, minimum included angle must be greater than 5 degrees). Then as you are creating the mesh, pressing one button at the top level of the interface will immediately display all grids that violate the rule.

rules provide proactive mesh quality assessment

By creating rules that define acceptable values of mesh quality metrics, you will immediately be notified when and where those rules are broken. This image shows a broken rule for cell spacing ratio on curves (red) and another broken rule for surface mesh cell included angle (yellow).

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