doc/salome/examples/creating_meshes_ex06.py

   1 # Creating a hexahedral mesh on a cylinder.
   2 # Note: it is a copy of 'ex24_cylinder.py' from SMESH_SWIG
   3
   4 import math
   5
   6 import geompy
   7 import smesh
   8 import salome
   9 geo = geompy
  10
  11 # Parameters
  12 # ----------
  13
  14 radius =  50
  15 height = 200
  16
  17 # Build a cylinder
  18 # ----------------
  19
  20 base = geo.MakeVertex(0, 0, 0)
  21 direction = geo.MakeVectorDXDYDZ(0, 0, 1)
  22
  23 cylinder = geo.MakeCylinder(base, direction, radius, height)
  24
  25 geo.addToStudy(cylinder, "cylinder")
  26
  27 # Build blocks
  28 # ------------
  29
  30 size = radius/2.0
  31
  32 box_rot = geo.MakeBox(-size, -size, 0,  +size, +size, height)
  33 box_axis = geo.MakeLine(base, direction)
  34 box = geo.MakeRotation(box_rot, box_axis, math.pi/4)
  35
  36 hole = geo.MakeCut(cylinder, box)
  37
  38 plane_trim = 2000
  39
  40 plane_a = geo.MakePlane(base, geo.MakeVectorDXDYDZ(1, 0, 0), plane_trim)
  41 plane_b = geo.MakePlane(base, geo.MakeVectorDXDYDZ(0, 1, 0), plane_trim)
  42
  43 blocks_part = geo.MakePartition([hole], [plane_a, plane_b], [], [], geo.ShapeType["SOLID"])
  44 blocks_list = [box] + geo.SubShapeAll(blocks_part, geo.ShapeType["SOLID"])
  45 blocks_all = geo.MakeCompound(blocks_list)
  46 blocks = geo.MakeGlueFaces(blocks_all, 0.0001)
  47
  48 geo.addToStudy(blocks, "cylinder:blocks")
  49
  50 # Build geometric groups
  51 # ----------------------
  52
  53 def group(name, shape, type, base=None, direction=None):
  54     t = geo.ShapeType[type]
  55     g = geo.CreateGroup(shape, t)
  56
  57     geo.addToStudy(g, name)
  58     g.SetName(name)
  59
  60     if base!=None:
  61         l = geo.GetShapesOnPlaneWithLocationIDs(shape, t, direction, base, geo.GEOM.ST_ON)
  62         geo.UnionIDs(g, l)
  63
  64     return g
  65
  66 group_a = group("baseA", blocks, "FACE", base, direction)
  67
  68 base_b  = geo.MakeVertex(0, 0, height)
  69 group_b = group("baseB", blocks, "FACE", base_b, direction)
  70
  71 group_1 = group("limit", blocks, "SOLID")
  72 group_1_all = geo.SubShapeAllIDs(blocks, geo.ShapeType["SOLID"])
  73 geo.UnionIDs(group_1, group_1_all)
  74 group_1_box = geo.GetBlockNearPoint(blocks, base)
  75 geo.DifferenceList(group_1, [group_1_box])
  76
  77 # Mesh the blocks with hexahedral
  78 # -------------------------------
  79
  80 smesh.SetCurrentStudy(salome.myStudy)
  81
  82 def discretize(x, y, z,  n, s=blocks):
  83     p = geo.MakeVertex(x, y, z)
  84     e = geo.GetEdgeNearPoint(s, p)
  85     a = hexa.Segment(e)
  86     a.NumberOfSegments(n)
  87     a.Propagation()
  88
  89 hexa = smesh.Mesh(blocks)
  90
  91 hexa_1d = hexa.Segment()
  92 hexa_1d.NumberOfSegments(1)
  93
  94 discretize(+radius        , +radius,        0,   5)
  95 discretize(-radius        , +radius,        0,   8)
  96 discretize((radius+size)/2,       0,        0,  10)
  97 discretize(        +radius,       0, height/2,  20)
  98
  99 hexa.Quadrangle()
 100 hexa.Hexahedron()
 101
 102 hexa.Compute()
 103
 104 hexa.Group(group_a)
 105 hexa.Group(group_b)
 106 hexa.Group(group_1)