# A question about patches

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 November 16, 2013, 11:55 A question about patches #1 Senior Member   Bobi Join Date: Oct 2012 Location: Chicago, Illinois Posts: 397 Rep Power: 7 Greetings all I am trying to make a 3D mesh with blockMesh utility. I have found an example of cylinder mesh in this subforum. I have a question about patches. The example mesh is as follows: Code: ``` vertices ( ( 1.25 0.0 1.25) // Vertex fiveoclocksqb = 0 (-1.25 0.0 1.25) // Vertex sevenoclocksqb = 1 (-1.25 0.0 -1.25) // Vertex elevenoclocksqb = 2 ( 1.25 0.0 -1.25) // Vertex oneoclocksqb = 3 ( 1.76776695455285 0.0 1.76776695137989) // Vertex fiveoclockcb = 4 (-1.76776695455285 0.0 1.76776695137989) // Vertex sevenoclockcb = 5 (-1.76776695455285 0.0 -1.76776695137989) // Vertex elevenoclockcb = 6 ( 1.76776695455285 0.0 -1.76776695137989) // Vertex oneoclockcb = 7 ( 1.25 100 1.25) // Vertex fiveoclocksqt = 8 (-1.25 100 1.25) // Vertex sevenoclocksqt = 9 (-1.25 100 -1.25) // Vertex elevenoclocksqt = 10 ( 1.25 100 -1.25) // Vertex oneoclocksqt = 11 ( 1.76776695455285 100 1.76776695137989) // Vertex fiveoclockct = 12 (-1.76776695455285 100 1.76776695137989) // Vertex sevenoclockct = 13 (-1.76776695455285 100 -1.76776695137989) // Vertex elevenoclockct = 14 ( 1.76776695455285 100 -1.76776695137989) // Vertex oneoclockct = 15 ); blocks ( //square block hex (1 0 3 2 9 8 11 10) (3 3 10) simpleGrading (1 1 1) //slice1 hex (5 4 0 1 13 12 8 9) (3 3 10) simpleGrading (1 1 1) //slice2 hex (1 2 6 5 9 10 14 13) (3 3 10)simpleGrading (1 1 1) ); //create the quarter circles edges ( arc 4 5 (0.0 0.0 2.5) arc 5 6 (-2.5 0.0 0.0) arc 6 7 (0.0 0.0 -2.5) arc 7 4 (2.5 0.0 0.0) ); patches ( patch outlet ( (2 4(0 3 2 1)) (2 4(0 4 7 3)) (2 4(4 0 1 5)) (2 4(1 2 6 5)) (2 4(3 7 6 2)) )``` My question is what are these 2 and 4 before (0 3 2 1) in the outlet patch? (2 4(0 3 2 1)) these 2 and 4 have been repeated for all other patches? Regards Bobi Last edited by babakflame; December 12, 2013 at 04:16.