smesh/doc/salome/examples/creating_meshes_ex06.py

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# Creating a hexahedral mesh on a cylinder.
#
# This example uses Partition to divide the cylinder into blocks, which is
# a general approach. But for the case of cylinder there is a dedicated
# command creating a blocked cylinder: geompy.MakeDividedCylinder()
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import salome
salome.salome_init()
import GEOM
from salome.geom import geomBuilder
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geompy = geomBuilder.New()
import SMESH, SALOMEDS
from salome.smesh import smeshBuilder
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smesh = smeshBuilder.New()
import math
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# Parameters
# ----------
radius = 50
height = 200
# Build a cylinder
# ----------------
base = geompy.MakeVertex(0, 0, 0)
direction = geompy.MakeVectorDXDYDZ(0, 0, 1)
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cylinder = geompy.MakeCylinder(base, direction, radius, height)
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geompy.addToStudy(cylinder, "cylinder")
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# Build blocks
# ------------
size = radius/2.0
box_rot = geompy.MakeBox(-size, -size, 0, +size, +size, height)
box_axis = geompy.MakeLine(base, direction)
box = geompy.MakeRotation(box_rot, box_axis, math.pi/4)
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hole = geompy.MakeCut(cylinder, box)
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plane_trim = 2000
plane_a = geompy.MakePlane(base, geompy.MakeVectorDXDYDZ(1, 0, 0), plane_trim)
plane_b = geompy.MakePlane(base, geompy.MakeVectorDXDYDZ(0, 1, 0), plane_trim)
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blocks_part = geompy.MakePartition([hole], [plane_a, plane_b], [], [], geompy.ShapeType["SOLID"])
blocks_list = [box] + geompy.SubShapeAll(blocks_part, geompy.ShapeType["SOLID"])
blocks_all = geompy.MakeCompound(blocks_list)
blocks = geompy.MakeGlueFaces(blocks_all, 0.0001)
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geompy.addToStudy(blocks, "cylinder:blocks")
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# Build geometric groups
# ----------------------
group_a = geompy.CreateGroup(blocks, geompy.ShapeType["FACE"])
geompy.addToStudyInFather(blocks, group_a, "baseA")
items = geompy.GetShapesOnPlaneWithLocationIDs(blocks, geompy.ShapeType["FACE"], direction, base, GEOM.ST_ON)
geompy.UnionIDs(group_a, items)
base_b = geompy.MakeVertex(0, 0, height)
group_b = geompy.CreateGroup(blocks, geompy.ShapeType["FACE"])
geompy.addToStudyInFather(blocks, group_b, "baseB")
items = geompy.GetShapesOnPlaneWithLocationIDs(blocks, geompy.ShapeType["FACE"], direction, base_b, GEOM.ST_ON)
geompy.UnionIDs(group_b, items)
group_1 = geompy.CreateGroup(blocks, geompy.ShapeType["SOLID"])
geompy.addToStudyInFather(blocks, group_1, "limit")
group_1_all = geompy.SubShapeAllIDs(blocks, geompy.ShapeType["SOLID"])
geompy.UnionIDs(group_1, group_1_all)
group_1_box = geompy.GetBlockNearPoint(blocks, base)
geompy.DifferenceList(group_1, [group_1_box])
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# Mesh the blocks with hexahedral
# -------------------------------
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smesh.UpdateStudy()
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hexa = smesh.Mesh(blocks)
hexa_1d = hexa.Segment()
hexa_1d.NumberOfSegments(1)
vertex = geompy.MakeVertex(+radius, +radius, 0)
edge = geompy.GetEdgeNearPoint(blocks, vertex)
algo = hexa.Segment(edge)
algo.NumberOfSegments(5)
algo.Propagation()
vertex = geompy.MakeVertex(-radius, +radius, 0)
edge = geompy.GetEdgeNearPoint(blocks, vertex)
algo = hexa.Segment(edge)
algo.NumberOfSegments(8)
algo.Propagation()
vertex = geompy.MakeVertex((radius+size)/2, 0, 0)
edge = geompy.GetEdgeNearPoint(blocks, vertex)
algo = hexa.Segment(edge)
algo.NumberOfSegments(10)
algo.Propagation()
vertex = geompy.MakeVertex(+radius, 0, height/2)
edge = geompy.GetEdgeNearPoint(blocks, vertex)
algo = hexa.Segment(edge)
algo.NumberOfSegments(20)
algo.Propagation()
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hexa.Quadrangle()
hexa.Hexahedron()
hexa.Compute()
hexa.Group(group_a)
hexa.Group(group_b)
hexa.Group(group_1)