From 37e49a62c831fb537c4937a27faee217c0fae0b8 Mon Sep 17 00:00:00 2001
From: Robert Kloefkorn <robert.kloefkorn@iris.no>
Date: Tue, 9 Feb 2016 16:39:30 +0100
Subject: [PATCH] BlackoilModelBase: use single precision for solver when dt <
 20 days.

---
 opm/autodiff/BlackoilModelBase_impl.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/opm/autodiff/BlackoilModelBase_impl.hpp b/opm/autodiff/BlackoilModelBase_impl.hpp
index 6eb4ece58..49721c6b4 100644
--- a/opm/autodiff/BlackoilModelBase_impl.hpp
+++ b/opm/autodiff/BlackoilModelBase_impl.hpp
@@ -250,7 +250,8 @@ namespace detail {
         const bool converged = asImpl().getConvergence(dt, iteration);
         const bool must_solve = (iteration < nonlinear_solver.minIter()) || (!converged);
         if (must_solve) {
-            residual_.singlePrecision = false ;
+            // enable single precision for solvers when dt is smaller then 20 days
+            residual_.singlePrecision = (unit::convert::to(dt, unit::day) < 20.) ;
 
             // Compute the nonlinear update.
             V dx = asImpl().solveJacobianSystem();