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Some of the left-handed face problems can be fixed using the following text user interface command In T-Grid: /boundary/repair-face-handedness In Fluent: /define/boundary-conditions/modify-zones/repair-face-handedness define/boundary-conditions/modify-zones/repair-face-node-order If you are still not able to resolve the issue, check the location of left handed faces in T-Grid using the GUI: Display-> Grid-> Faces->Left Handed Inspect the mesh visually near the left handed faces. Look for any problems in mesh. Check if there is any erroneous element. Take appropriate action to repair mesh.