6.5.2 Repairing Face Handedness and Node Order

The mesh check report will indicate if the mesh contains left-handed faces and/or faces that have the wrong node order. You must take steps to repair such meshes, since you cannot obtain a flow solution until all of the faces are right handed and have the proper node order.

If your mesh contains both left-handed faces and faces with the wrong node order, begin by repairing the node order with the following text command:

define $\rightarrow$ boundary-conditions $\rightarrow$ modify-zones $\rightarrow$ repair-face-node-order

Since the left-handed faces may be a result of improper face node order, the previous text command may resolve both issues at the same time. Be sure to perform another mesh check after entering the repair-face-node-order command, to see if the mesh has been fully repaired.

If at any point the mesh check reveals that the mesh contains left-handed faces without any node order issues, you can attempt to repair the face handedness by modifying the cell centroids with the following text command:

define $\rightarrow$ boundary-conditions $\rightarrow$ modify-zones $\rightarrow$ repair-face-handedness

Once again, perform a mesh check to see if the text command was successful. The repair-face-handedness text command is most effective for cells with high aspect ratios.