topoptlab.output_designs module

topoptlab.output_designs.export_stl(filename: str, nelx: int, nely: int, xPhys: ndarray, volfrac: float) → None[source]

Export design to a stl file for 3D printing.

Parameters:

  • filename (str) – filename without “.vtk” ending.

  • nelx (int) – number of elements in x direction.

  • nely (int) – number of elements in y direction.

  • xPhys (np.ndarray) – densities used to scale the material properties.

  • volfrac (float, optional) – volume fraction. If not None, then also a thresholded designed is stored. The default is None.

Return type:

None.

topoptlab.output_designs.export_vtk(filename: str, nelx: int, nely: int, xPhys: ndarray, nelz: None | int, x: None | ndarray = None, u: None | ndarray = None, f: None | ndarray = None, u_bw: None | ndarray = None, f_bw: None | ndarray = None, xTilde: None | ndarray = None, elem_size: None | float | ndarray = None, volfrac: None | float = None, stress_vm: None | float | ndarray = None, vectors: None | ndarray = None) → None[source]

Export design to a vtk file for visualisation e. g. with Paraview.

Parameters:

  • filename (str) – filename without “.vtk” ending.

  • nelx (int) – number of elements in x direction.

  • nely (int) – number of elements in y direction.

  • xPhys (np.ndarray) – densities used to scale the material properties.

  • nelz (int) – number of elements in z direction.

  • x (np.ndarray, optional) – interemdiary densities as (usually) returned by the optimizer.

  • u (np.ndarray, optional) – field variable (displacements, temperature) which is usually the left hand side of the generic matrix problem Ku=f. The default is None.

  • f (np.ndarray, optional) – flow variable (forces, heat sources/sinks) which is usually the right hand side of the generic matrix problem Ku=f

  • u_bw (np.ndarray, optional) – field variable of the final black/white design. The default is None.

  • f_bw (np.ndarray, optional) – flow variable of the final black/white design. The default is None.

  • xTilde (np.ndarray, optional) – interemdiary densities by the density filter. So far they only occur if Haeviside projections are used. The default is None.

  • elem_size (np.ndarray, float) – element size.

  • volfrac (float, optional) – volume fraction. If not None, then also a thresholded designed is stored. The default is None.

  • stress_vm (np.ndarray, optional) – von Mises stress.

  • vectors (np.ndarray) – vectors [cos(theta)cos(phi); sin(theta)cos(phi); -sin(phi)] used to show the orientation arrow field in Paraview.

Return type:

None.

topoptlab.output_designs.threshold(xPhys: ndarray, volfrac: float) → ndarray[source]

Threshold grey scale design to black and white design.

Parameters:

  • xPhys (np.array, shape (nel)) – element densities for topology optimization used for scaling the material properties.

  • volfrac (float) – volume fraction.

Returns:

xPhys – thresholded element densities for topology optimization used for scaling the material properties.

Return type:

np.array, shape (nel)