[Gmsh] How to generate 'plugin crack' for post processing

[Xiaoxin Lu]

Hello, 

I am a PhD student using GMSH to generate crack faces. However, I could not find any example for this kind of post processing. 
My .geo file is attached below, I put 'plugin crack' command inside but it did not work, I was wondering how to generate a post process file for this command. 

Thank you for your help. 

best regards, 
Xiaoxin 
//start of the file 
lc1 = 3; 
lc2 = 3; 

// We proceed by defining some elementary entities describing a cube: 

Point(1) = {0,0,0,lc1}; 
Point(2) = {40,0,0,lc1}; 
Point(3) = {40,40,0,lc1}; 
Point(4) = {0,40,0,lc1}; 
Point(5) = {0,0,40,lc1}; 
Point(6) = {40,0,40,lc1}; 
Point(7) = {40,40,40,lc1}; 
Point(8) = {0,40,40,lc1}; 

Line(30)={1,2}; 
Line(31)={2,3}; 
Line(32)={3,4}; 
Line(33)={4,1}; 
Line(34)={5,6}; 
Line(35)={6,7}; 
Line(36)={7,8}; 
Line(37)={8,5}; 
Line(38)={1,5}; 
Line(39)={2,6}; 
Line(40)={3,7}; 
Line(41)={4,8}; 
Line Loop(42)={30,31,32,33}; 
Plane Surface(14)={42}; 
Line Loop(43)={-37,-36,-35,-34}; 
Plane Surface(16)={43}; 
Line Loop(44)={38,34,-39,-30}; 
Plane Surface(18)={44}; 
Line Loop(45)={-32,40,36,-41}; 
Plane Surface(20)={45}; 
Line Loop(46)={-33,41,37,-38}; 
Plane Surface(22)={46}; 
Line Loop(47)={39,35,-40,-31}; 
Plane Surface(24)={47}; 
vol1[]=Extrude{0,0,40}{Surface{14};}; 
Delete {Volume{vol1[1]};} 
vol2[]=Extrude{0,40,0}{Surface{18};}; 
Delete {Volume{vol2[1]};} 
vol3[]=Extrude{40,0,0}{Surface{22};}; 
Delete {Volume{vol3[1]};} 
Physical Surface(1)={14}; 
Physical Surface(2)={vol1[0]}; 
Physical Surface(3)={18}; 
Physical Surface(4)={vol2[0]}; 
Physical Surface(5)={22}; 
Physical Surface(6)={vol3[0]}; 
Surface Loop(1)={14,vol2[0],vol3[0],18,22,vol1[0]}; 
Volume(1)={1}; 
Physical Volume(1)={1}; 

//n=1; add a crack surface. 
Point(5000)={1.645000e+01,7.466800e+00,5.890600e+00,lc2}; 
Point(5001)={1.728000e+01,2.112300e+01,1.204100e+01,lc2}; 
Point(5002)={2.823700e+01,1.636900e+01,2.111600e+01,lc2}; 
Point(5003)={2.740700e+01,2.713500e+00,1.496600e+01,lc2}; 
Line(5004)={5000,5001}; 
Line(5005)={5001,5002}; 
Line(5006)={5002,5003}; 
Line(5007)={5003,5000}; 
Line Loop(5008)={5004,5005,5006,5007}; 
Plane Surface(5009)={5008}; 
Physical Surface(11)={5009}; 
Surface{5009} In Volume{1}; 

Plugin(Crack).Dimension = 2 ; 
Plugin(Crack).PhysicalGroup = 11 ; 
Plugin(Crack).OpenBoundaryPhysicalGroup = 0 ; 
Plugin(Crack).Run ; 
//end of the file 
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