smesh/doc/examples/defining_hypotheses_ex08.py

# Propagation

import salome
salome.salome_init_without_session()

from salome.geom import geomBuilder
from salome.smesh import smeshBuilder

geom_builder = geomBuilder.New()
smesh_builder = smeshBuilder.New()

# create a box
base = geom_builder.MakeSketcher("Sketcher:F 0 0:TT 10 0:TT 20 10:TT 0 10:WF", theName="F")
box  = geom_builder.MakePrismDXDYDZ( base, 0,0,10 )
geom_builder.addToStudy(box, "Box")

# get one edge of the box to put local hypothesis on
p5 = geom_builder.MakeVertex(5., 0., 0.)
EdgeX = geom_builder.GetEdgeNearPoint(box, p5)
geom_builder.addToStudyInFather(box, EdgeX, "Edge [0,0,0 - 10,0,0]")

# create a hexahedral mesh on the box
hexa = smesh_builder.Mesh(box, "Propagation of hypothesis")

# set global algorithms and hypotheses
algo1D = hexa.Segment()
hexa.Quadrangle()
hexa.Hexahedron()
algo1D.NumberOfSegments(4)

# create a sub-mesh with local 1D hypothesis and "Propagation of 1D Hypothesis"
algo_local = hexa.Segment(EdgeX)

# define "Arithmetic1D" hypothesis to cut an edge in several segments with increasing length
algo_local.Arithmetic1D(1, 4)

# define "Propagation" hypothesis that propagates "Arithmetic1D" hypothesis
# from 'EdgeX' on opposite sides of all quadilateral faces
algo_local.Propagation()

# compute the mesh which contains prisms
if not hexa.Compute(): raise Exception("Error when computing Mesh")

# create another mesh on the box
mesh = smesh_builder.Mesh(box, "Propagation of distribution of nodes")

# set global algorithms and hypotheses
algo1D = mesh.Segment()
mesh.Quadrangle()
mesh.Hexahedron()
algo1D.NumberOfSegments(4)

# create a sub-mesh with local 1D hypothesis and "Propagation of Node Distribution"
algo_local = mesh.Segment(EdgeX)
algo_local.Arithmetic1D(1, 4)

# define "Propagation Of Distribution" hypothesis that propagates
# distribution of nodes generated by "Arithmetic1D" hypothesis
# from 'EdgeX' on opposite sides of all quadilateral faces
algo_local.PropagationOfDistribution()

# compute the mesh which contains hexahedra only
if not mesh.Compute(): raise Exception("Error when computing Mesh")