René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Improving Mesh Quality of Turbulent Onera M6 mesh","articleBody":"Hi guys,\n\nI was looking for a hex mesh of the Onera M6 airfoil and came across your tutorial + provided grid. I encounter the issue, though, that a few elements are distorted, i.e., the hexes/quads are effectively degenerated to prisms/triangles. When executing the example with `SU2_CFD` you actually get a corresponding warning:\n\n```\n------------------- Geometry Preprocessing ( Zone 0 ) -------------------\nThree dimensional problem.\n46417 grid points.\n43008 volume elements.\n3 surface markers.\n2560 boundary elements in index 0 (Marker = FARFIELD).\n1408 boundary elements in index 1 (Marker = WING).\n2688 boundary elements in index 2 (Marker = SYMMETRY).\n43008 hexahedra.\nSetting point connectivity.\nRenumbering points (Reverse Cuthill McKee Ordering).\nRecomputing point connectivity.\nSetting element connectivity.\nChecking the numerical grid orientation.\n\u003e\u003e\u003e WARNING: 18 HEXAHEDRON, volume elements are distorted.\n    It was not possible to determine if their orientation is correct.\nThere has been a re-orientation of 4 QUADRILATERAL surface elements.\n\u003e\u003e\u003e WARNING: 1 QUADRILATERAL surface elements are distorted.\n    It was not possible to determine if their orientation is correct.\n```\n\nHere are two screenshots of the troubling quad\n\n![Image](https://github.com/user-attachments/assets/8a365f37-3b37-48c2-9331-1ed8887cbcad)\n\n![Image](https://github.com/user-attachments/assets/785d962c-f053-4996-bb4e-5ee5d1660207)\n\n\nSo my question is twofold: \n\n1. Do you also provide the corresponding grid generation software, s.t. I can try improving the grid myself?\n2. Is there a way to access the (possibly) improved grid? Based on `There has been a re-orientation of 4 QUADRILATERAL surface elements.` I have hope that the grid is improved at runtime. Using that grid might actually be good enough for me.\n\nBest,\nDaniel\n","author":{"url":"https://github.com/DanielDoehring","@type":"Person","name":"DanielDoehring"},"datePublished":"2025-02-05T08:11:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/59/Tutorials/issues/59"}