Note
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Export a field to VTKΒΆ
The objective here is to create a field and export it as a VTK file. A field is the agregation of a mesh of a domain and a sample of values in associated to each vertex of the mesh.
We note the vertices of and the associated values in .
A field is stored in the Field object that stores the mesh and the values at each vertex of the mesh. It can be built from a mesh and values or as a realization of a stochastic process.
import openturns as ot
import openturns.viewer as viewer
from matplotlib import pylab as plt
ot.Log.Show(ot.Log.NONE)
First, we define a regular 2-d mesh
discretization = [10, 5]
mesher = ot.IntervalMesher(discretization)
lowerBound = [0.0, 0.0]
upperBound = [2.0, 1.0]
interval = ot.Interval(lowerBound, upperBound)
mesh = mesher.build(interval)
graph = mesh.draw()
graph.setTitle("Regular 2-d mesh")
view = viewer.View(graph)
We now create a field from a mesh and some values
values = ot.Normal([0.0] * 2, [1.0] * 2, ot.CorrelationMatrix(2)).getSample(
len(mesh.getVertices())
)
for i in range(len(values)):
x = values[i]
values[i] = 0.05 * x / x.norm()
field = ot.Field(mesh, values)
We can export the field to a VTK files. It can be read later with an external program such as Paraview.
field.exportToVTKFile("field.vtk")
Display figures
plt.show()