smesh/doc/examples/creating_meshes_ex06.py

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3.6 KiB
Python

# 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: geom_builder.MakeDividedCylinder()
import math
import salome
salome.salome_init_without_session()
import GEOM
from salome.geom import geomBuilder
from salome.smesh import smeshBuilder
geom_builder = geomBuilder.New()
smesh_builder = smeshBuilder.New()
# Parameters
# ----------
radius = 50
height = 200
# Build a cylinder
# ----------------
base = geom_builder.MakeVertex(0, 0, 0)
direction = geom_builder.MakeVectorDXDYDZ(0, 0, 1)
cylinder = geom_builder.MakeCylinder(base, direction, radius, height)
geom_builder.addToStudy(cylinder, "cylinder")
# Build blocks
# ------------
size = radius/2.0
box_rot = geom_builder.MakeBox(-size, -size, 0, +size, +size, height)
box_axis = geom_builder.MakeLine(base, direction)
box = geom_builder.MakeRotation(box_rot, box_axis, math.pi/4)
hole = geom_builder.MakeCut(cylinder, box)
plane_trim = 2000
plane_a = geom_builder.MakePlane(base, geom_builder.MakeVectorDXDYDZ(1, 0, 0), plane_trim)
plane_b = geom_builder.MakePlane(base, geom_builder.MakeVectorDXDYDZ(0, 1, 0), plane_trim)
blocks_part = geom_builder.MakePartition([hole], [plane_a, plane_b], [], [], geom_builder.ShapeType["SOLID"])
blocks_list = [box] + geom_builder.SubShapeAll(blocks_part, geom_builder.ShapeType["SOLID"])
blocks_all = geom_builder.MakeCompound(blocks_list)
blocks = geom_builder.MakeGlueFaces(blocks_all, 0.0001)
geom_builder.addToStudy(blocks, "cylinder:blocks")
# Build geometric groups
# ----------------------
group_a = geom_builder.CreateGroup(blocks, geom_builder.ShapeType["FACE"])
geom_builder.addToStudyInFather(blocks, group_a, "baseA")
items = geom_builder.GetShapesOnPlaneWithLocationIDs(blocks, geom_builder.ShapeType["FACE"], direction, base, GEOM.ST_ON)
geom_builder.UnionIDs(group_a, items)
base_b = geom_builder.MakeVertex(0, 0, height)
group_b = geom_builder.CreateGroup(blocks, geom_builder.ShapeType["FACE"])
geom_builder.addToStudyInFather(blocks, group_b, "baseB")
items = geom_builder.GetShapesOnPlaneWithLocationIDs(blocks, geom_builder.ShapeType["FACE"], direction, base_b, GEOM.ST_ON)
geom_builder.UnionIDs(group_b, items)
group_1 = geom_builder.CreateGroup(blocks, geom_builder.ShapeType["SOLID"])
geom_builder.addToStudyInFather(blocks, group_1, "limit")
group_1_all = geom_builder.SubShapeAllIDs(blocks, geom_builder.ShapeType["SOLID"])
geom_builder.UnionIDs(group_1, group_1_all)
group_1_box = geom_builder.GetBlockNearPoint(blocks, base)
geom_builder.DifferenceList(group_1, [group_1_box])
# Mesh the blocks with hexahedral
# -------------------------------
smesh_builder.UpdateStudy()
hexa = smesh_builder.Mesh(blocks)
hexa_1d = hexa.Segment()
hexa_1d.NumberOfSegments(1)
vertex = geom_builder.MakeVertex(+radius, +radius, 0)
edge = geom_builder.GetEdgeNearPoint(blocks, vertex)
algo = hexa.Segment(edge)
algo.NumberOfSegments(5)
algo.Propagation()
vertex = geom_builder.MakeVertex(-radius, +radius, 0)
edge = geom_builder.GetEdgeNearPoint(blocks, vertex)
algo = hexa.Segment(edge)
algo.NumberOfSegments(8)
algo.Propagation()
vertex = geom_builder.MakeVertex((radius+size)/2, 0, 0)
edge = geom_builder.GetEdgeNearPoint(blocks, vertex)
algo = hexa.Segment(edge)
algo.NumberOfSegments(10)
algo.Propagation()
vertex = geom_builder.MakeVertex(+radius, 0, height/2)
edge = geom_builder.GetEdgeNearPoint(blocks, vertex)
algo = hexa.Segment(edge)
algo.NumberOfSegments(20)
algo.Propagation()
hexa.Quadrangle()
hexa.Hexahedron()
hexa.Compute()
hexa.Group(group_a)
hexa.Group(group_b)
hexa.Group(group_1)