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76 lines
2.6 KiB
Python
76 lines
2.6 KiB
Python
# Usage of Extrusion 3D meshing algorithm
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import salome
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salome.salome_init_without_session()
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from salome.geom import geomBuilder
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from salome.smesh import smeshBuilder
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geom_builder = geomBuilder.New()
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smesh_builder = smeshBuilder.New()
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OX = geom_builder.MakeVectorDXDYDZ(1,0,0)
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OY = geom_builder.MakeVectorDXDYDZ(0,1,0)
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OZ = geom_builder.MakeVectorDXDYDZ(0,0,1)
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# Y ^ Make geometry of a "pipe" with the following base (cross section).
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# | Big central quadrangles will be meshed with triangles, walls
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# of the pipe will be meshed with quadrilaterals
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# +--+--+--+--+--+--+
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# | | | | | | |
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# +--+--+--+--+--+--+
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# | | | | |
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# +--+ | +--+
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# | | | | |
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# +--+-----+-----+--+
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# | | | | |
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# +--+ | +--+
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# | | | | |
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# +--+--+--+--+--+--+
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# | | | | | | | -->
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# +--+--+--+--+--+--+ X
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quadBig = geom_builder.MakeFaceHW( 20,20, 1 )
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quadBig = geom_builder.MakeTranslation( quadBig, 15,15,0 )
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quadSmall = geom_builder.MakeFaceHW( 10,10, 1 )
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smallQuads1 = geom_builder.MakeMultiTranslation1D( quadSmall, OX, 10, 3 )
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smallQuads2 = geom_builder.MakeMultiTranslation1D( quadSmall, OY, 10, 3 )
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smallQuads2 = geom_builder.SubShapeAllSortedCentres( smallQuads2, geom_builder.ShapeType["FACE"])[1:]
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base = geom_builder.MakeCompound( smallQuads2 + [smallQuads1, quadBig])
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axis = geom_builder.MakeLine( geom_builder.MakeVertex( 25,25,0), OZ )
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base = geom_builder.MultiRotate1DNbTimes( base, axis, 4)
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base = geom_builder.MakePartition( [base], theName="base")
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path = geom_builder.MakeSketcher("Sketcher:F 0 0:TT 0 100:R 0:C -90 180:T 0 -150",[0,0,0, 0,-1,0, 1,0,0])
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# Make the pipe, each quadrangle of the base turns into a prism with composite wall faces
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pipe = geom_builder.MakePipe( base, path )
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prisms = geom_builder.MakePartition( [pipe], theName="prisms")
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# get base faces of the prism to define sub-mesh on them
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smallQuad = geom_builder.GetFaceNearPoint( prisms, geom_builder.MakeVertex( 0,0,0 ), "smallQuad")
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bigQuad = geom_builder.GetFaceNearPoint( prisms, geom_builder.MakeVertex( 15,15,0 ), "bigQuad")
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mesh = smesh_builder.Mesh( prisms )
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# assign Global hypotheses
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# 1D algorithm and hypothesis for division along the pipe
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mesh.Segment().NumberOfSegments(15)
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# Extrusion 3D algo
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mesh.Prism()
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# assign Local hypotheses
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# 1D and 2D algos and hyps to mesh smallQuad with quadrilaterals
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mesh.Segment(smallQuad).LocalLength( 3 )
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mesh.Quadrangle(smallQuad)
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# 1D and 2D algos and hyps to mesh bigQuad with triangles
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mesh.Segment(bigQuad).LocalLength( 3 )
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mesh.Triangle(bigQuad)
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# compute the mesh
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if not mesh.Compute(): raise Exception("Error when computing Mesh")
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