|
[Sponsors] |
[blockMesh] How to increase Mesh near the surface of the model |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
September 1, 2008, 09:23 |
How to increase Mesh near the surface of the model
|
#1 |
Senior Member
weihong yao
Join Date: Mar 2009
Posts: 117
Rep Power: 17 |
hi,
i am use OF1.4,i don't know how to increase Mesh near the surface of the model? |
|
September 1, 2008, 11:19 |
If you talk about the surface
|
#2 |
Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Copenhagen, Denmark
Posts: 1,900
Rep Power: 37 |
If you talk about the surface of some multiphase flow, then I do not think it is straight forward.
If you talk about increasing the number of computational cells toward the boundaries of your computational domain, then look into the user guide, the meshing chapter and especially the grading routines. - Niels
__________________
Please note that I do not use the Friend-feature, so do not be offended, if I do not accept a request. |
|
September 1, 2008, 20:16 |
hi,
I think i have got your m
|
#3 |
Senior Member
weihong yao
Join Date: Mar 2009
Posts: 117
Rep Power: 17 |
hi,
I think i have got your message.thank you! |
|
September 1, 2008, 21:20 |
hi,
i have followed your sugg
|
#4 |
Senior Member
weihong yao
Join Date: Mar 2009
Posts: 117
Rep Power: 17 |
hi,
i have followed your suggestion.but it can not increase nunber of the cells.my blockMesh.file are follow: vertices ( (-3 -3 0) (3 -3 0) (3 3 0) (-3 3 0) (-3 -3 6) (3 -3 6) (3 3 6) (-3 3 6) (-39 -3 0) (-39 3 0) (-39 -3 6) (-39 3 6) (153 -3 0) (153 3 0) (153 -3 6) (153 3 6) (-3 -60 0) (3 -60 0) (-3 -60 6) (3 -60 6) (-3 60 0) (3 60 0) (-3 60 6) (3 60 6) (-39 -60 0) (153 -60 0) (153 60 0) (-39 60 0) (-39 -60 6) (153 -60 6) (153 60 6) (-39 60 6) (-39 -60 60) (153 -60 60) (153 60 60) (-39 60 60) (-39 -3 60) (-39 3 60) (-3 -60 60) (3 -60 60) (153 -3 60) (153 3 60) (-3 60 60) (3 60 60) (-3 -3 60) (3 -3 60) (3 3 60) (-3 3 60) ); blocks ( hex (24 16 0 8 28 18 4 10) (36 57 6) simpleGrading (1 1 1) hex (28 18 4 10 32 38 44 36) (36 57 54) simpleGrading (1 1 1) hex (16 17 1 0 18 19 5 4) (6 57 6) simpleGrading (1 1 1) hex (18 19 5 4 38 39 45 44) (6 57 54) simpleGrading (1 1 1) hex (17 25 12 1 19 29 14 5) (150 57 6) simpleGrading (1 1 1) hex (19 29 14 5 39 33 40 45) (150 57 54) simpleGrading (1 1 1) hex (1 12 13 2 5 14 15 6) (150 6 6) simpleGrading (1 1 1) hex (5 14 15 6 45 40 41 46) (150 6 54) simpleGrading (1 1 1) hex (2 13 26 21 6 15 30 23) (150 57 6) simpleGrading (1 1 1) hex (6 15 30 23 46 41 34 43) (150 57 54) simpleGrading (1 1 1) hex (3 2 21 20 7 6 23 22) (6 57 6) simpleGrading (1 1 1) hex (7 6 23 22 47 46 43 42) (6 57 54) simpleGrading (1 1 1) hex (9 3 20 27 11 7 22 31) (36 57 6) simpleGrading (1 1 1) hex (11 7 22 31 37 47 42 35) (36 57 54) simpleGrading (1 1 1) hex (8 0 3 9 10 4 7 11) (36 6 6) simpleGrading (1 1 1) hex (10 4 7 11 36 44 47 37) (36 6 54) simpleGrading (1 1 1) hex (4 5 6 7 44 45 46 47) (6 6 54) simpleGrading (1 1 1) ); edges ( ); patches ( patch inlet ( (27 9 11 31) (37 11 31 35) (9 8 10 11) (11 10 36 37) (8 24 28 10) (10 28 32 36) ) patch outlet ( (25 12 14 29) (29 14 40 33) (12 13 15 14) (14 15 41 40) (13 26 30 15) (15 30 34 41) ) wall front ( (0 3 7 4) ) wall <back> ( (1 2 6 5) ) wall <left> ( (0 1 5 4) ) wall <right> ( (2 3 7 6) ) wall <top> ( (4 5 6 7) ) empty <wall> ( (24 16 18 28) (28 18 38 32) (16 17 19 18) (18 19 39 38) (17 25 29 19) (19 29 33 39) (26 21 23 30) (30 23 43 34) (21 20 22 23) (23 22 42 43) (20 27 31 22) (22 31 35 42) (32 38 44 36) (44 36 37 47) (47 37 35 42) (38 39 45 44) (44 45 46 47) (47 46 43 42) (39 33 40 45) (40 45 46 41) (41 46 43 34) (16 24 8 0) (0 8 9 3) (3 9 27 20) (17 16 0 1) (2 3 20 21) (25 17 1 12) (12 1 2 13) (13 2 21 26) ) wall <bottom> ( ) ); mergePatchPairs ( ); I change the simpleGrading(1 1 1) by (1 1 5).my geometry is very simple ,just put the 6*6*6 cube into 192*120*60 box.my purpose is increasing grid near the surface of the cube. would someone help me? |
|
September 1, 2008, 21:32 |
Hi, WeiHong,
First of all,
|
#5 |
Member
Ivan Lau
Join Date: Mar 2009
Location: Hong Kong
Posts: 56
Rep Power: 17 |
Hi, WeiHong,
First of all, changing simpleGrading, which is cell expansion ratios, will not increase the number of cells. Read the manual here: http://www.opencfd.co.uk/openfoam/do...#x25-1390005.3 Hmm.. I see what you try to do. Well, where do you put that (1 1 5)? If you really want to intensively increase the number of cells close to surface, I recommend you to add one more strip above.. It is not too hard, but tedious, somehow. iL |
|
September 1, 2008, 22:44 |
hi,ivan,
thank you for giving
|
#6 |
Senior Member
weihong yao
Join Date: Mar 2009
Posts: 117
Rep Power: 17 |
hi,ivan,
thank you for giving the feedback! first, i put the (1 1 5)into simpleGrading of the blocks,as follow: hex (24 16 0 8 28 18 4 10) (36 57 6) simpleGrading (1 1 5) hex (28 18 4 10 32 38 44 36) (36 57 54) simpleGrading (1 1 5) hex (16 17 1 0 18 19 5 4) (6 57 6) simpleGrading (1 1 5) hex (18 19 5 4 38 39 45 44) (6 57 54) simpleGrading (1 1 5) hex (17 25 12 1 19 29 14 5) (150 57 6) simpleGrading (1 1 5) hex (19 29 14 5 39 33 40 45) (150 57 54) simpleGrading (1 1 5) hex (1 12 13 2 5 14 15 6) (150 6 6) simpleGrading (1 1 5) hex (5 14 15 6 45 40 41 46) (150 6 54) simpleGrading (1 1 5) hex (2 13 26 21 6 15 30 23) (150 57 6) simpleGrading (1 1 5) hex (6 15 30 23 46 41 34 43) (150 57 54) simpleGrading (1 1 5) hex (3 2 21 20 7 6 23 22) (6 57 6) simpleGrading (1 1 5) hex (7 6 23 22 47 46 43 42) (6 57 54) simpleGrading (1 1 5) hex (9 3 20 27 11 7 22 31) (36 57 6) simpleGrading (1 1 5) hex (11 7 22 31 37 47 42 35) (36 57 54) simpleGrading (1 1 5) hex (8 0 3 9 10 4 7 11) (36 6 6) simpleGrading (1 1 5) hex (10 4 7 11 36 44 47 37) (36 6 54) simpleGrading (1 1 5) hex (4 5 6 7 44 45 46 47) (6 6 54) simpleGrading (1 1 5) ); is that the only way to increase the grid close the surface of cube?you mean that create more vertices and blocks? |
|
September 2, 2008, 12:10 |
hi, weihong,
Yes, you can cre
|
#7 |
Member
Ivan Lau
Join Date: Mar 2009
Location: Hong Kong
Posts: 56
Rep Power: 17 |
hi, weihong,
Yes, you can create more vertices and blocks next to surface and increase the number of cells here. Does your blockMesh work? If so, what you did now is to put the bottom cells with closer space and the top cells far apart.... Did you follow the meshing routine like what Niels suggest? Read words by words on manual of Meshing. You can easily solve this problem. Regards, iL |
|
September 3, 2008, 03:16 |
hi,
thank you!i solved th
|
#8 |
Senior Member
weihong yao
Join Date: Mar 2009
Posts: 117
Rep Power: 17 |
hi,
thank you!i solved the problem. thank you! |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Surface mesh from polygon model of motorcycle | Simonomis | Main CFD Forum | 3 | July 27, 2011 15:27 |
fluent add additional zones for the mesh file | SSL | FLUENT | 2 | January 26, 2008 11:55 |
Icemcfd 11: Loss of mesh from surface mesh option? | Joe | CFX | 2 | March 26, 2007 18:10 |
How to control Minximum mesh space? | hung | FLUENT | 7 | April 18, 2005 09:38 |
CFX4.3 -build analysis form | Chie Min | CFX | 5 | July 12, 2001 23:19 |