From: Peter Munch <peterrmuench@gmail.com>
Date: Thu, 1 Jul 2021 13:04:32 +0000 (+0200)
Subject: Use prolongate_and_add() in Multigrid::level_v_step()
X-Git-Tag: v9.4.0-rc1~1173^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F12530%2Fhead;p=dealii.git

Use prolongate_and_add() in Multigrid::level_v_step()
---

diff --git a/include/deal.II/multigrid/multigrid.templates.h b/include/deal.II/multigrid/multigrid.templates.h
index b8a7f3ba6e..d8f40db0f2 100644
--- a/include/deal.II/multigrid/multigrid.templates.h
+++ b/include/deal.II/multigrid/multigrid.templates.h
@@ -139,11 +139,9 @@ Multigrid<VectorType>::level_v_step(const unsigned int level)
 
   // do coarse grid correction
   this->signals.prolongation(true, level);
-  transfer->prolongate(level, t[level], solution[level - 1]);
+  transfer->prolongate_and_add(level, solution[level], solution[level - 1]);
   this->signals.prolongation(false, level);
 
-  solution[level] += t[level];
-
   // get in contribution from edge matrices to the defect
   if (edge_in != nullptr)
     {