# [blockMesh] Thin Vertical Wall - Bird Book problem 13.4

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 December 8, 2020, 13:35 Thin Vertical Wall - Bird Book problem 13.4 #1 New Member   Fortunato Neto Join Date: Dec 2020 Location: Brazil Posts: 3 Rep Power: 2 Hello everyone. I'm trying to simulate the Bird's problem in section of 13.4, that must use the dsmcFoam solver. But, in this case we must build a wall, something linke that: |--------------| |____|_____| The thin wall is in the bottom middle. Image the hifens as the domain roof. I'm new in OpenFoam and I noted that it have a problem in declaring internal faces, then I created four points twice declared as walls1 and walls2, as shown below. HTML Code: ```vertices ( (-5 0 0) // 0 (0 0 0) // 1 (0 10 0) // 2 (-5 10 0) // 3 (-5 0 36) // 4 (0 0 36) // 5 (0 10 36) // 6 (-5 10 36)// 7 (-5 0 18) // 8 (0 0 18) // 9 (0 10 18) // 10 (-5 10 18)// 11 (20 0 36) // 12 (20 10 36)// 13 (20 0 18) // 14 (20 10 18)// 15 (20 0 0) // 16 (20 10 0) // 17 (0 0 0) // 18 -1 (0 0 18) // 19 -9 (0 10 18) // 20 -10 (0 10 0) // 21 -2 ); blocks ( hex (0 1 2 3 8 9 10 11) (10 36 36) simpleGrading (1 1 1) // Block 1 hex (8 9 10 11 4 5 6 7) (10 36 36) simpleGrading (1 1 1) // Block 2 //hex (1 16 17 2 9 14 15 10) (40 36 36) simpleGrading (1 1 1) // Block 3 //hex (9 14 15 10 5 12 13 6) (40 36 36) simpleGrading (1 1 1) // Block 4 hex (18 16 17 21 19 14 15 20) (40 36 36) simpleGrading (1 1 1) // Block 3 hex (19 14 15 20 5 12 13 6) (40 36 36) simpleGrading (1 1 1) // Block 4 ); boundary ( flow { type patch; faces ( (4 5 6 7) (5 12 13 6) (0 8 11 3) (8 4 7 11) (3 11 10 2) (11 7 6 10) (6 13 15 20) (21 20 15 17) (0 8 9 1) (8 4 5 9) (18 19 14 16) (19 5 12 14) (12 13 15 14) (14 15 17 16) ); } plan1 { type symmetryPlane; faces ( (0 1 2 3) ); } plan2 { type symmetryPlane; faces ( (18 16 17 21) ); } walls1 { type wall; faces ( (2 10 9 1) ); } walls2 { type wall; faces ( (18 19 20 21) ); } )``` The problem runs, blockMesh works, dsmcInitialise works, but the code stops in first "particles inserted" count. I think is a problem about the "thin wall" inserted. Can anybody tell me if it is ok? Or, I must change it? __________________ Santos Dumont - Father of Aviation

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