doc/examples/creating_meshes_ex06.py

   1 # Creating a hexahedral mesh on a cylinder.
   2 #
   3 # This example uses Partition to divide the cylinder into blocks, which is
   4 # a general approach. But for the case of cylinder there is a dedicated
   5 # command creating a blocked cylinder: geom_builder.MakeDividedCylinder()
   6
   7 import math
   8
   9 import salome
  10 salome.salome_init_without_session()
  11
  12 import GEOM
  13 from salome.geom import geomBuilder
  14 from salome.smesh import smeshBuilder
  15
  16 geom_builder = geomBuilder.New()
  17 smesh_builder = smeshBuilder.New()
  18
  19 # Parameters
  20 # ----------
  21
  22 radius =  50
  23 height = 200
  24
  25 # Build a cylinder
  26 # ----------------
  27
  28 base      = geom_builder.MakeVertex(0, 0, 0)
  29 direction = geom_builder.MakeVectorDXDYDZ(0, 0, 1)
  30
  31 cylinder = geom_builder.MakeCylinder(base, direction, radius, height)
  32
  33 geom_builder.addToStudy(cylinder, "cylinder")
  34
  35 # Build blocks
  36 # ------------
  37
  38 size = radius/2.0
  39
  40 box_rot  = geom_builder.MakeBox(-size, -size, 0,  +size, +size, height)
  41 box_axis = geom_builder.MakeLine(base, direction)
  42 box      = geom_builder.MakeRotation(box_rot, box_axis, math.pi/4)
  43
  44 hole = geom_builder.MakeCut(cylinder, box)
  45
  46 plane_trim = 2000
  47
  48 plane_a = geom_builder.MakePlane(base, geom_builder.MakeVectorDXDYDZ(1, 0, 0), plane_trim)
  49 plane_b = geom_builder.MakePlane(base, geom_builder.MakeVectorDXDYDZ(0, 1, 0), plane_trim)
  50
  51 blocks_part = geom_builder.MakePartition([hole], [plane_a, plane_b], [], [], geom_builder.ShapeType["SOLID"])
  52 blocks_list = [box] + geom_builder.SubShapeAll(blocks_part, geom_builder.ShapeType["SOLID"])
  53 blocks_all  = geom_builder.MakeCompound(blocks_list)
  54 blocks      = geom_builder.MakeGlueFaces(blocks_all, 0.0001)
  55
  56 geom_builder.addToStudy(blocks, "cylinder:blocks")
  57
  58 # Build geometric groups
  59 # ----------------------
  60
  61 group_a = geom_builder.CreateGroup(blocks, geom_builder.ShapeType["FACE"])
  62 geom_builder.addToStudyInFather(blocks, group_a, "baseA")
  63 items = geom_builder.GetShapesOnPlaneWithLocationIDs(blocks, geom_builder.ShapeType["FACE"], direction, base, GEOM.ST_ON)
  64 geom_builder.UnionIDs(group_a, items)
  65
  66 base_b = geom_builder.MakeVertex(0, 0, height)
  67 group_b = geom_builder.CreateGroup(blocks, geom_builder.ShapeType["FACE"])
  68 geom_builder.addToStudyInFather(blocks, group_b, "baseB")
  69 items = geom_builder.GetShapesOnPlaneWithLocationIDs(blocks, geom_builder.ShapeType["FACE"], direction, base_b, GEOM.ST_ON)
  70 geom_builder.UnionIDs(group_b, items)
  71
  72 group_1 = geom_builder.CreateGroup(blocks, geom_builder.ShapeType["SOLID"])
  73 geom_builder.addToStudyInFather(blocks, group_1, "limit")
  74 group_1_all = geom_builder.SubShapeAllIDs(blocks, geom_builder.ShapeType["SOLID"])
  75 geom_builder.UnionIDs(group_1, group_1_all)
  76 group_1_box = geom_builder.GetBlockNearPoint(blocks, base)
  77 geom_builder.DifferenceList(group_1, [group_1_box])
  78
  79 # Mesh the blocks with hexahedral
  80 # -------------------------------
  81
  82 smesh_builder.UpdateStudy()
  83
  84 hexa = smesh_builder.Mesh(blocks)
  85
  86 hexa_1d = hexa.Segment()
  87 hexa_1d.NumberOfSegments(1)
  88
  89 vertex = geom_builder.MakeVertex(+radius, +radius, 0)
  90 edge = geom_builder.GetEdgeNearPoint(blocks, vertex)
  91 algo = hexa.Segment(edge)
  92 algo.NumberOfSegments(5)
  93 algo.Propagation()
  94
  95 vertex = geom_builder.MakeVertex(-radius, +radius, 0)
  96 edge = geom_builder.GetEdgeNearPoint(blocks, vertex)
  97 algo = hexa.Segment(edge)
  98 algo.NumberOfSegments(8)
  99 algo.Propagation()
 100
 101 vertex = geom_builder.MakeVertex((radius+size)/2, 0, 0)
 102 edge = geom_builder.GetEdgeNearPoint(blocks, vertex)
 103 algo = hexa.Segment(edge)
 104 algo.NumberOfSegments(10)
 105 algo.Propagation()
 106
 107 vertex = geom_builder.MakeVertex(+radius, 0, height/2)
 108 edge = geom_builder.GetEdgeNearPoint(blocks, vertex)
 109 algo = hexa.Segment(edge)
 110 algo.NumberOfSegments(20)
 111 algo.Propagation()
 112
 113 hexa.Quadrangle()
 114 hexa.Hexahedron()
 115
 116 hexa.Compute()
 117
 118 hexa.Group(group_a)
 119 hexa.Group(group_b)
 120 hexa.Group(group_1)