From: David Wells <drwells@email.unc.edu>
Date: Sat, 28 May 2022 00:25:31 +0000 (-0400)
Subject: Fix ARKODE 3 test.
X-Git-Tag: v9.4.0-rc1~82^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=93d31b7a85585c10b3bfe2c77b0174460721a5de;p=dealii.git

Fix ARKODE 3 test.

This works with both 5.4 and 6.2 now.
---

diff --git a/tests/sundials/arkode_03.output b/tests/sundials/arkode_03.output
index 503f3a999d..4d8a78f72d 100644
--- a/tests/sundials/arkode_03.output
+++ b/tests/sundials/arkode_03.output
@@ -1,12 +1,12 @@
 
 DEAL::0.00000 3.900000000 1.100000000 2.800000000
-DEAL::1.000000000 2.075274578 1.059601971 2.499947291
-DEAL::2.000000000 1.100460018 1.723610111 2.499972248
-DEAL::3.000000000 0.7896202372 2.326668043 2.499980243
-DEAL::4.000000000 0.8117726433 2.725583965 2.499982784
-DEAL::5.000000000 1.187002916 2.595541878 2.499973234
-DEAL::6.000000000 1.887311324 1.494098057 2.499934582
-DEAL::7.000000000 1.323271340 1.619016372 2.499963670
-DEAL::8.000000000 0.9217874641 2.130219386 2.499972986
-DEAL::9.000000000 0.8495425770 2.539475069 2.499983024
-DEAL::10.00000000 1.064969831 2.595955794 2.499973386
+DEAL::1.000000000 2.075274578 1.059601971 2.499947382
+DEAL::2.000000000 1.100460018 1.723610111 2.499972220
+DEAL::3.000000000 0.7896202372 2.326668043 2.499980117
+DEAL::4.000000000 0.8117726433 2.725583965 2.499984008
+DEAL::5.000000000 1.187002916 2.595541878 2.499971084
+DEAL::6.000000000 1.887311324 1.494098057 2.499930049
+DEAL::7.000000000 1.323271341 1.619016372 2.499966501
+DEAL::8.000000000 0.9217874641 2.130219386 2.499975040
+DEAL::9.000000000 0.8495425770 2.539475069 2.499979558
+DEAL::10.00000000 1.064969831 2.595955794 2.499973382
diff --git a/tests/sundials/arkode_03_in.prm b/tests/sundials/arkode_03_in.prm
index ce054b3b58..f035bb5164 100644
--- a/tests/sundials/arkode_03_in.prm
+++ b/tests/sundials/arkode_03_in.prm
@@ -2,14 +2,18 @@ set Final time                        = 10
 set Initial time                      = 0
 set Time interval between each output = 0.1
 subsection Error control
-  set Absolute error tolerance = 0.00000001
-  set Relative error tolerance = 0.00000001
+  # making this tolerance any lower prevents convergence in 5.4:
+  # this is fixed in 6.2
+  set Absolute error tolerance = 1e-8
+  set Relative error tolerance = 1e-8
 end
 subsection Running parameters
   set Implicit function is linear            = true
   set Implicit function is time independent  = true
-  set Initial step size                      = 0.010000
-  set Maximum number of nonlinear iterations = 10
+  set Initial step size                      = 1e-6
+  set Maximum number of nonlinear iterations = 30
   set Maximum order of ARK                   = 5
-  set Minimum step size                      = 0.000001
+  set Minimum step size                      = 1e-7
+  # A larger subspace, combined with looser tolerances, are required by 5.4
+  set Anderson-acceleration subspace         = 5
 end