pmgbergen · Yuriyzabegaev · Nov 21, 2024 · Oct 24, 2024 · Nov 7, 2024 · Nov 8, 2024
@@ -5,11 +5,14 @@
 
 from __future__ import annotations
 
+import typing
+from pathlib import Path
 from typing import Optional
 
 import numpy as np
 
 import porepy as pp
+from porepy.fracs.fracture_network_2d import FractureNetwork2d
 
 
 def orthogonal_fractures_2d(
@@ -126,6 +129,35 @@ def benchmark_2d_case_3(size: pp.number = 1) -> list[pp.LineFracture]:
     return fractures
 
 
+def benchmark_2d_case_4() -> list[pp.LineFracture]:
+    """Returns a fracture set that corresponds to Case 4 from the 2D flow benchmark [1].
+
+    The setup is composed of 64 fractures grouped in 13 different connected networks,
+    ranging from isolated fractures up to tens of fractures each.
+
+    References:
+        - [1] Flemisch, B., Berre, I., Boon, W., Fumagalli, A., Schwenck, N.,
+        Scotti, A., ... & Tatomir, A. (2018). Benchmarks for single-phase flow in
+        fractured porous media. Advances in Water Resources, 111, 239-258.
+
+    """
+    fracture_network_path = (
+        Path(__file__).parent
+        / "gmsh_file_library"
+        / "benchmark_2d_case_4"
+        / "fracture_network_benchmark_2d_case_4.csv"
+    )
+    # ``network_2d_from_csv`` is called with ``return_frac_id=False``, i.e.,
+    # ``fracture_network`` is actually a ``FractureNetwork2D`` object.
+    fracture_network = typing.cast(
+        FractureNetwork2d,
+        pp.fracture_importer.network_2d_from_csv(str(fracture_network_path)),
+    )
+    # We return only the fractures to stay consistent with the other functions' API from
+    # this file.
+    return fracture_network.fractures
+
+
 def seven_fractures_one_L_intersection(size: pp.number = 1) -> list[pp.LineFracture]:
     """Return a list of seven fractures with one L intersection.
 

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