Support multiple volumes in a discretization collection

.pylintrc-local.yml

@@ -1,14 +1,6 @@
 - arg: ignore
   val:
     - mappers
-    - gas_dynamics
-    - burgers.py
-    - diffusion.py
-    - dt_finding.py
-    - nd_calculus.py
-    - pml.py
-    - poisson.py
-    - second_order.py
 - arg: ignored-modules
   val:
   - sympy

doc/conf.py

@@ -35,6 +35,7 @@ def get_version():
     "https://documen.tician.de/arraycontext/": None,
     "https://documen.tician.de/meshmode/": None,
     "https://documen.tician.de/loopy/": None,
+    "https://mpi4py.readthedocs.io/en/stable": None,
     }
 
 # index-page demo uses pyopencl via plot_directive

examples/hello-grudge.py

@@ -14,7 +14,7 @@
 import grudge.op as op
 from meshmode.mesh.generation import generate_box_mesh
 from meshmode.array_context import PyOpenCLArrayContext
-from grudge.dof_desc import DTAG_BOUNDARY, FACE_RESTR_INTERIOR
+from grudge.dof_desc import BoundaryDomainTag, FACE_RESTR_INTERIOR
 
 
 ctx = cl.create_some_context()
@@ -51,8 +51,8 @@ def flux(dcoll, u_tpair):
 
 
 vol_discr = dcoll.discr_from_dd("vol")
-left_bndry = DTAG_BOUNDARY("left")
-right_bndry = DTAG_BOUNDARY("right")
+left_bndry = BoundaryDomainTag("left")
+right_bndry = BoundaryDomainTag("right")
 
 x_vol = actx.thaw(dcoll.nodes())
 x_bndry = actx.thaw(dcoll.discr_from_dd(left_bndry).nodes())

grudge/__init__.py

@@ -20,8 +20,9 @@
 THE SOFTWARE.
 """
 
-from grudge.discretization import DiscretizationCollection
+from grudge.discretization import (
+        DiscretizationCollection, make_discretization_collection)
 
 __all__ = [
-    "DiscretizationCollection"
+    "DiscretizationCollection", "make_discretization_collection"
 ]