# [Gmsh] Gmsh: Unstructured to Structured Mesh geometry

 Register Blogs Members List Search Today's Posts Mark Forums Read November 22, 2016, 12:55 Gmsh: Unstructured to Structured Mesh geometry #1 New Member   Paul Join Date: Jun 2016 Posts: 21 Rep Power: 6 Hi all, I've got a file that creates an unstructured mesh using Gmsh - a cuboidal region containing a series of nested cylinders. I would love to make it a structured mesh but have been having problems getting gmsh to do it. Does anyone know of a straightforward way to make it structured? I fear gmsh may be ill-equipped but I would be very happy to be proven wrong. Cheers. Code: ```//Inputs m=1; //scale w = 0.0126*m;//m width of cell h = w;//m height of cell r0 = 0.004095*m;//m pin radius r1= 0.003738206*m;//zone1 outer radius r2 = 0.003343553*m; //zone2 outer radius r3 = 0.002895602*m;//zone3 outer radius r4= 0.002364249*m;//zone4 outer radius r5=0.001671777*m; t = 0.000655*m;//m clad thickness gridsize = w/6; cladgrid=w/6; d = w/10; //Define cell border Point(1) = {0, 0, 0, gridsize}; Point(2) = {w, 0, 0, gridsize}; Point(3) = {w, h, 0, gridsize}; Point(4) = {0, h, 0, gridsize}; Point(5) = {w/2, h/2, 0, gridsize}; //Clad outer radius points Point(6) = {(r0+t+w/2), h/2, 0, cladgrid}; Point(7) = {w/2, (r0+t+h/2), 0, cladgrid}; Point(8) = {(-r0-t+w/2), h/2, 0, cladgrid}; Point(9) = {w/2, (-r0-t+h/2), 0, cladgrid}; //Radius 0 Point(10) = {(r0+w/2), h/2, 0, cladgrid}; Point(11) = {w/2, (r0+h/2), 0, cladgrid}; Point(12) = {(-r0+w/2), h/2, 0, cladgrid}; Point(13) = {w/2, (-r0+h/2), 0, cladgrid}; //Radius 1 Point(14) = {(r1+w/2), h/2, 0, cladgrid}; Point(15) = {w/2, (r1+h/2), 0, cladgrid}; Point(16) = {(-r1+w/2), h/2, 0, cladgrid}; Point(17) = {w/2, (-r1+h/2), 0, cladgrid}; //Radius 2 Point(18) = {(r2+w/2), h/2, 0, cladgrid}; Point(19) = {w/2, (r2+h/2), 0, cladgrid}; Point(20) = {(-r2+w/2), h/2, 0, cladgrid}; Point(21) = {w/2, (-r2+h/2), 0, cladgrid}; //Radius 3 Point(22) = {(r3+w/2), h/2, 0, cladgrid}; Point(23) = {w/2, (r3+h/2), 0, cladgrid}; Point(24) = {(-r3+w/2), h/2, 0, cladgrid}; Point(25) = {w/2, (-r3+h/2), 0, cladgrid}; //Radius 4 Point(26) = {(r4+w/2), h/2, 0, cladgrid}; Point(27) = {w/2, (r4+h/2), 0, cladgrid}; Point(28) = {(-r4+w/2), h/2, 0, cladgrid}; Point(29) = {w/2, (-r4+h/2), 0, cladgrid}; //Radius 5 Point(30) = {(r5+w/2), h/2, 0, cladgrid}; Point(31) = {w/2, (r5+h/2), 0, cladgrid}; Point(32) = {(-r5+w/2), h/2, 0, cladgrid}; Point(33) = {w/2, (-r5+h/2), 0, cladgrid}; //Cell border Line(1) = {4, 3}; Line(2) = {3, 2}; Line(3) = {2, 1}; Line(4) = {1, 4}; //Clad circumference Circle(5) = {8, 5, 7}; Circle(6) = {7, 5, 6}; Circle(7) = {6, 5, 9}; Circle(8) = {9, 5, 8}; //Pin R0 Circle(9) = {12, 5, 11}; Circle(10) = {11, 5, 10}; Circle(11) = {10, 5, 13}; Circle(12) = {13, 5, 12}; //R1 Circle(13)={16,5,15}; Circle(14)={15,5,14}; Circle(15)={14,5,17}; Circle(16)={17,5,16}; //R2 Circle(17) = {20,5,19}; Circle(18)={19,5,18}; Circle(19)={18,5,21}; Circle(20)={21,5,20}; //R3 Circle(21)={24,5,23}; Circle(22)={23,5,22}; Circle(23)={22,5,25}; Circle(24)={25,5,24}; //R4 Circle(25)={28,5,27}; Circle(26)={27,5,26}; Circle(27)={26,5,29}; Circle(28)={29,5,28}; //R5 Circle(29)={32,5,31}; Circle(30)={31,5,30}; Circle(31)={30,5,33}; Circle(32)={33,5,32}; Line Loop(1) = {4, 1, 2, 3}; Line Loop(2) = {5, 6, 7, 8}; Line Loop(3) = {9, 10, 11, 12}; Line Loop(4) = {13,14,15,16}; Line Loop(5) = {17,18,19,20}; Line Loop(6) = {21,22,23,24}; Line Loop(7) = {25,26,27,28}; Line Loop(8) = {29,30,31,32}; Plane Surface(1) = {1,2}; Ruled Surface(2) = {2, 3}; Ruled Surface(3) = {3, 4}; Ruled Surface(4) = {4,5}; Ruled Surface(5) = {5,6}; Ruled Surface(6) = {6, 7}; Ruled Surface(7) = {7,8}; Ruled Surface(8) = {8}; surfaceVector[] = Extrude {0, 0, d} { Surface{1}; Layers{1}; Recombine;}; Physical Volume("moderator") = surfaceVector; Physical Surface("LeftWall")=surfaceVector; Physical Surface("RightWall")=surfaceVector; Physical Surface("BottomWall")=surfaceVector; Physical Surface("TopWall")=surfaceVector; surfaceVector[] = Extrude {0, 0, d} { Surface{2}; Layers{1}; Recombine;}; Physical Volume ("clad") = surfaceVector; surfaceVector[] = Extrude {0, 0, d} { Surface{3}; Layers{1}; Recombine;}; Physical Volume ("fuel1") = surfaceVector; surfaceVector[] = Extrude {0, 0, d} { Surface{4}; Layers{1}; Recombine;}; Physical Volume ("fuel2") = surfaceVector; surfaceVector[] = Extrude {0, 0, d} { Surface{5}; Layers{1}; Recombine;}; Physical Volume ("fuel3") = surfaceVector; surfaceVector[] = Extrude {0, 0, d} { Surface{6}; Layers{1}; Recombine;}; Physical Volume ("fuel4") = surfaceVector; surfaceVector[] = Extrude {0, 0, d} { Surface{7}; Layers{1}; Recombine;}; Physical Volume ("fuel5") = surfaceVector; surfaceVector[] = Extrude {0, 0, d} { Surface{8}; Layers{1}; Recombine;}; Physical Volume ("fuel6") = surfaceVector;```  Thread Tools Search this Thread Show Printable Version Email this Page Search this Thread: Advanced Search Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules Similar Threads Thread Thread Starter Forum Replies Last Post quarkz Pointwise & Gridgen 2 March 5, 2019 22:05 Althea FLUENT 22 January 4, 2017 03:19 Jvb ANSYS Meshing & Geometry 6 January 2, 2012 11:41 kawamatt2 ANSYS Meshing & Geometry 17 December 20, 2011 11:45 SSL FLUENT 2 January 26, 2008 11:55