From 6c0ee61d6fa356a9bac99bc5dea24ab1d63fba82 Mon Sep 17 00:00:00 2001
From: Tobias Meyer Andersen <tobiasmeyer.andersen@sintef.no>
Date: Tue, 28 Nov 2023 10:59:46 +0100
Subject: [PATCH] add ILUn smoother

---
 opm/simulators/linalg/PreconditionerFactory_impl.hpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/opm/simulators/linalg/PreconditionerFactory_impl.hpp b/opm/simulators/linalg/PreconditionerFactory_impl.hpp
index 1531477d5..e147d104e 100644
--- a/opm/simulators/linalg/PreconditionerFactory_impl.hpp
+++ b/opm/simulators/linalg/PreconditionerFactory_impl.hpp
@@ -262,6 +262,15 @@ struct StandardPreconditioners
               auto crit = AMGHelper<O,C,M,V>::criterion(prm);
               PrecPtr prec = std::make_shared<Dune::Amg::AMGCPR<O, V, Smoother, C>>(op, crit, sargs, comm);
               return prec;
+            }
+            else if (smoother == "ILUn") {
+              using SeqSmoother = SeqILU<M, V, V>;
+              using Smoother = Dune::BlockPreconditioner<V, V, C, SeqSmoother>;
+              using SmootherArgs = typename Dune::Amg::SmootherTraits<Smoother>::Arguments;
+              SmootherArgs sargs;
+              auto crit = AMGHelper<O,C,M,V>::criterion(prm);
+              PrecPtr prec = std::make_shared<Dune::Amg::AMGCPR<O, V, Smoother, C>>(op, crit, sargs, comm);
+              return prec;
             }else {
               OPM_THROW(std::invalid_argument, "Properties: No smoother with name " + smoother + ".");
             }