The onlyĭifference is that the Firedrake functions include an extra optional argumentĪxes to specify the matplotlib Axes object The functions tripcolor, tricontour, and so forth, all behave more or less like theirĬounterparts in matplotlib, and actually call them under the hood. The API for plotting mimics that of matplotlib as much as possible. Plotting with matplotlib ¶įiredrake includes support for plotting meshes and functions using matplotlib. Product of elements of degree 4 and 2 will be turned into a tensor Will be over the elements of the tuple too, meaning a tensor (this occurs when using tensor product elements), the the maximum The basis will be the maximum degree used over the spaces Output will use a piecewise discontinuous space. If any of theįunctions are at least partially discontinuous, again including theĬoordinate field (this occurs when using periodic meshes), then the \(H^1\)), then the output space will be a piecewise continuous space. Second, if all functions are continuous (i.e. Must be defined via the same cell type otherwise an exception will be To the same file must be represented in the same space, the rulesįor selecting the output space are as follows. write ( p, u, time = 1 ) Selecting the output space when outputting multiple functions ¶Īll functions, including the mesh coordinates, that are output write ( u, time = 1 ) # as does this outfile. U = Function ( V, name = "Velocity" ) p = Function ( P, name = "Pressure" ) outfile = File ( "output.pvd" ) outfile. The tessellatedĭata can also be saved for future reference. This issue: the Tessellate filter produces another unstructured grid from its inputs soĪlgorithms can be applied to both the tessellated and input unstructured grid. That might be applied to the original data or composed with the tools listed above.ĭocumentation on these interactions is sparse, but tessellation can be used to understand Maximum number of times an edge in the original geometry can be subdivided.īesides the two tools listed above, Paraview provides many other tools (filters) The Maximum Number of Subdivisions is the The midpoints of the edges of the tessellated geometry and the corresponding On the tessellated data is compared pointwise to the original data at Field Error is analogous to Chord Error: the error of the field Is a tessellation error metric, the distance between the midpoint of anyĮdge on the tessellated geometry and a corresponding point in the original Order geometry via subdividing cells into smaller linear cells. Tessellation is the process of approximating a higher The Tessellate filter can be applied to unstructured grid dataĪnd has three parameters: Chord Error, Maximum Number of Subdivisions,Īnd Field Error. Further, the Nonlinear Subdivision Level can also beĬhanged after applying filters such as Extract Surface. The display of unstructured grid data and can be used to present a plausibleĬurved geometry. The Nonlinear Subdivision Level can be increased this option controls Under the display properties of an unstructured grid, This approximation can be controlled in at least two ways: Paraview’s visualisation algorithims are typically exact on piecewise linear data,īut if you write higher order data, Paraview will produce an approximate visualisation. write ( f ) Using Paraview on higher order data ¶ Projected = File ( "proj_output.pvd", target_degree = 1, target_continuity = H1 ) projected. If we want it to be interpolated in the output file we can use For example,Īssume we wish to output a vector-valued function that lives in an \(H(\operatorname)\) Operations automatically, we just need to choose whether we want data to be Such a common operation, the File object is set up to manage these One option is to do so by hand before outputting.Įither by interpolating or else projecting Other than these spaces we must transform the data to thisįormat first. The mesh coordinates associated to a field must be represented Represented with an arbitrary order (possibly discontinuous) Lagrange basis.įurthermore, the fields must be in an isoparametric function space, meaning Visualisation of scalar-, vector-, or tensor-valued fields The file format Firedrake outputs to currently supports the write ( f, time = t ) t = dt Visualising high-order data ¶ outfile = File ( "timesteps.pvd" ) while t < T.
0 Comments
Leave a Reply. |