smesh/test/SMESH_create_dual_mesh_tpipe.py

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#!/usr/bin/env python3
import sys
import salome
import math
salome.salome_init()
import GEOM
from salome.geom import geomBuilder
geompy = geomBuilder.New()
# first cylinder
r1 = 0.5
h1 = 5
# second cylinder
r2 = 0.3
h2 = 3
length_piquage = 1.5
O = geompy.MakeVertex(0, 0, 0)
OX = geompy.MakeVectorDXDYDZ(1, 0, 0)
OY = geompy.MakeVectorDXDYDZ(0, 1, 0)
OZ = geompy.MakeVectorDXDYDZ(0, 0, 1)
geompy.addToStudy( O, 'O' )
geompy.addToStudy( OX, 'OX' )
geompy.addToStudy( OY, 'OY' )
geompy.addToStudy( OZ, 'OZ' )
Cylinder_1 = geompy.MakeCylinderRH(r1, h1)
Cylinder_2 = geompy.MakeCylinderRH(r2, h2)
Rotation_1 = geompy.MakeRotation(Cylinder_2, OY, -90*math.pi/180.0)
Translation_1 = geompy.MakeTranslation(Rotation_1, 0, 0, length_piquage)
tpipe = geompy.MakeFuseList([Cylinder_1, Translation_1], True, True)
geompy.addToStudy( tpipe, 'tpipe' )
Inlet_z = geompy.GetFaceNearPoint(tpipe, O)
geompy.addToStudyInFather( tpipe, Inlet_z, 'Inlet_z' )
p_inlet_x = geompy.MakeVertex(-h2, 0, length_piquage)
Inlet_x = geompy.GetFaceNearPoint(tpipe, p_inlet_x)
geompy.addToStudyInFather( tpipe, Inlet_x, 'Inlet_x' )
p_outlet = geompy.MakeVertex(0, 0, h1)
Outlet = geompy.GetFaceNearPoint(tpipe, p_outlet)
geompy.addToStudyInFather( tpipe, Outlet, 'Outlet' )
Wall = geompy.CreateGroup(tpipe, geompy.ShapeType["FACE"])
faces = geompy.SubShapeAll(tpipe, geompy.ShapeType["FACE"])
geompy.UnionList(Wall, faces)
geompy.DifferenceList(Wall, [Inlet_x, Inlet_z, Outlet])
geompy.addToStudyInFather( tpipe, Wall, 'Wall' )
p_corner = geompy.MakeVertex(-r2, 0, length_piquage+r2)
corner = geompy.GetVertexNearPoint(tpipe, p_corner)
geompy.addToStudyInFather( tpipe, corner, 'corner' )
geom_groups = [Inlet_x, Inlet_z, Outlet, Wall]
volumeGEOM = geompy.BasicProperties(tpipe)[2]
###
### SMESH component
###
import SMESH, SALOMEDS
from salome.smesh import smeshBuilder
from salome.StdMeshers import StdMeshersBuilder
smesh = smeshBuilder.New()
# Coarse mesh with default hypothesis
Mesh_1 = smesh.Mesh(tpipe, "Mesh_coarse")
Mesh_1.Triangle(algo=smeshBuilder.NETGEN_1D2D)
algo3d = Mesh_1.Tetrahedron(algo=smeshBuilder.NETGEN_3D)
algo3d.MaxElementVolume(0.0002)
isDone = Mesh_1.Compute()
if not isDone:
raise Exception("Error when computing Mesh")
# Create groups
d_geom_groups = {}
d_mesh_groups = {}
for geom_group in geom_groups:
gr = Mesh_1.Group(geom_group)
gr_name = gr.GetName()
d_mesh_groups[gr_name] = gr
d_geom_groups[gr_name] = geom_group
# Check tetra mesh volume
tetra_volume = smesh.GetVolume(Mesh_1)
shape_volume = geompy.BasicProperties(tpipe)[2]
assert abs(tetra_volume-shape_volume)/shape_volume < 0.05
dual_Mesh_raw_1 = smesh.CreateDualMesh(Mesh_1, 'dual_Mesh_raw_1', False)
# check polyhedrons
assert dual_Mesh_raw_1.NbPolyhedrons() > 0
assert dual_Mesh_raw_1.NbPolyhedrons() == dual_Mesh_raw_1.NbVolumes()
# Check dual mesh volume
dual_raw_volume = dual_Mesh_raw_1.GetVolume()
assert abs(dual_raw_volume-shape_volume)/shape_volume < 0.14
# Check groups
dual_Mesh_raw_groups = dual_Mesh_raw_1.GetGroups()
dual_Mesh_raw_group_names = dual_Mesh_raw_1.GetGroupNames()
assert len(dual_Mesh_raw_groups) == 4
## Create dual mesh with projection on faces
dual_Mesh_1 = smesh.CreateDualMesh(Mesh_1, 'dual_Mesh_1', True)
# Check dual mesh volume
dual_volume = dual_Mesh_1.GetVolume()
print("shape_volume: ", shape_volume)
print("tetra_volume: ", tetra_volume)
print("dual_volume: ", dual_volume)
print("dual_raw_volume: ", dual_raw_volume)
assert (dual_volume >= dual_raw_volume)
assert abs(dual_volume-shape_volume)/shape_volume < 0.14
assert abs(dual_raw_volume-tetra_volume)/tetra_volume < 1e-12
# Check groups
dual_Mesh_groups = dual_Mesh_1.GetGroups()
dual_Mesh_group_names = dual_Mesh_1.GetGroupNames()
d_mesh_dual_groups = {}
for gr_name, gr in zip(dual_Mesh_group_names, dual_Mesh_groups):
gr_name = gr_name.strip()
d_mesh_dual_groups[gr_name] = gr
for gr_dual_raw, gr_name in zip(dual_Mesh_raw_groups, dual_Mesh_raw_group_names):
gr_name = gr_name.strip()
gr_tri = d_mesh_groups[gr_name]
gr_dual = d_mesh_dual_groups[gr_name]
gr_geom = d_geom_groups[gr_name]
area_gr_geom = geompy.BasicProperties(gr_geom)[1]
area_gr_tri = smesh.GetArea(gr_tri)
area_gr_dual_raw = smesh.GetArea(gr_dual_raw)
area_gr_dual = smesh.GetArea(gr_dual)
print(gr_name)
print("Area geom: ", area_gr_geom)
print("Area tri: ", area_gr_tri)
print("Area dual raw:", area_gr_dual_raw)
print("Area dual:", area_gr_dual)
assert abs(area_gr_geom-area_gr_dual)/area_gr_geom < 0.015
assert abs(area_gr_tri-area_gr_dual_raw)/area_gr_tri < 1e-3
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