From b471be590b4f31291704ed5a9bc0f063eb7ad4cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20Kl=C3=B6ckner?= <inform@tiker.net>
Date: Sun, 26 Apr 2020 20:10:15 +0200
Subject: [PATCH] Apply suggestion to grudge/symbolic/primitives.py
---
grudge/symbolic/primitives.py | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/grudge/symbolic/primitives.py b/grudge/symbolic/primitives.py
index 875a7bff..c2397c47 100644
--- a/grudge/symbolic/primitives.py
+++ b/grudge/symbolic/primitives.py
@@ -427,9 +427,17 @@ class Ones(HasDOFDesc, ExpressionBase):
class _SignedFaceOnes(HasDOFDesc, ExpressionBase):
- """Sets the face to :math:`-1` if its odd and :math:`+1` if its even.
+ """Produces DoFs on a face that are :math:`-1` if their corresponding
+ face number is odd and :math:`+1` if it is even.
+ *dd* must refer to a 0D (point-shaped) trace domain.
This is based on the face order of
:meth:`meshmode.mesh.MeshElementGroup.face_vertex_indices`.
+
+ .. note::
+
+ This is used as a hack to generate normals with the correct orientation
+ in 1D problems, and so far only intended for this particular use cases.
+ (If you can think of a better way, please speak up!)
"""
def __init__(self, dd):
--
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