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114 lines
3.0 KiB
Python
114 lines
3.0 KiB
Python
# Creating a hexahedral mesh on a cylinder.
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#
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# This example uses Partition to divide the cylinder into blocks, which is
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# a general approach. But for the case of cylinder there is a dedicated
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# command creating a blocked cylinder: geompy.MakeDividedCylinder()
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import salome
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salome.salome_init()
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import GEOM
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from salome.geom import geomBuilder
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geompy = geomBuilder.New(salome.myStudy)
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import SMESH, SALOMEDS
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from salome.smesh import smeshBuilder
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smesh = smeshBuilder.New(salome.myStudy)
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import math
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# Parameters
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# ----------
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radius = 50
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height = 200
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# Build a cylinder
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# ----------------
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base = geompy.MakeVertex(0, 0, 0)
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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
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# ------------
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size = radius/2.0
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box_rot = geompy.MakeBox(-size, -size, 0, +size, +size, height)
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box_axis = geompy.MakeLine(base, direction)
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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
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plane_a = geompy.MakePlane(base, geompy.MakeVectorDXDYDZ(1, 0, 0), plane_trim)
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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"])
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blocks_list = [box] + geompy.SubShapeAll(blocks_part, geompy.ShapeType["SOLID"])
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blocks_all = geompy.MakeCompound(blocks_list)
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blocks = geompy.MakeGlueFaces(blocks_all, 0.0001)
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geompy.addToStudy(blocks, "cylinder:blocks")
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# Build geometric groups
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# ----------------------
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def group(name, shape, type, base=None, direction=None):
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t = geompy.ShapeType[type]
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g = geompy.CreateGroup(shape, t)
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geompy.addToStudyInFather(shape, g, name)
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if base!=None:
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l = geompy.GetShapesOnPlaneWithLocationIDs(shape, t, direction, base, GEOM.ST_ON)
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geompy.UnionIDs(g, l)
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return g
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group_a = group("baseA", blocks, "FACE", base, direction)
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base_b = geompy.MakeVertex(0, 0, height)
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group_b = group("baseB", blocks, "FACE", base_b, direction)
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group_1 = group("limit", blocks, "SOLID")
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group_1_all = geompy.SubShapeAllIDs(blocks, geompy.ShapeType["SOLID"])
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geompy.UnionIDs(group_1, group_1_all)
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group_1_box = geompy.GetBlockNearPoint(blocks, base)
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geompy.DifferenceList(group_1, [group_1_box])
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# Mesh the blocks with hexahedral
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# -------------------------------
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smesh.SetCurrentStudy(salome.myStudy)
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def discretize(x, y, z, nbSeg, shape=blocks):
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vert = geompy.MakeVertex( x, y, z )
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edge = geompy.GetEdgeNearPoint( shape, vert )
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algo = hexa.Segment( edge )
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algo.NumberOfSegments( nbSeg )
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algo.Propagation()
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hexa = smesh.Mesh(blocks)
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hexa_1d = hexa.Segment()
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hexa_1d.NumberOfSegments(1)
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discretize(+radius , +radius, 0, 5)
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discretize(-radius , +radius, 0, 8)
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discretize((radius+size)/2, 0, 0, 10)
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discretize( +radius, 0, height/2, 20)
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hexa.Quadrangle()
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hexa.Hexahedron()
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hexa.Compute()
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hexa.Group(group_a)
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hexa.Group(group_b)
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hexa.Group(group_1)
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