From: Peter Munch <peterrmuench@gmail.com>
Date: Thu, 9 Jul 2020 18:01:26 +0000 (+0200)
Subject: Add check to step-12
X-Git-Tag: v9.3.0-rc1~1304^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F10680%2Fhead;p=dealii.git

Add check to step-12
---

diff --git a/examples/step-12/step-12.cc b/examples/step-12/step-12.cc
index fcec1e2c1f..70a6bd64c6 100644
--- a/examples/step-12/step-12.cc
+++ b/examples/step-12/step-12.cc
@@ -126,7 +126,9 @@ namespace Step12
     Point<dim> wind_field;
     wind_field(0) = -p(1);
     wind_field(1) = p(0);
-    wind_field /= wind_field.norm();
+
+    if (wind_field.norm() > 1e-10)
+      wind_field /= wind_field.norm();
 
     return wind_field;
   }