Merge branch 'develop' into feature/logging-updates

LLNL · Oct 21, 2024 · d037cb4 · d037cb4
2 parents 6e58390 + 5473f16
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,14 @@
 
 ### New Features and Enhancements
 
+The following DIRK schemes now have coefficients accurate to quad precision:
+* `ARKODE_BILLINGTON_3_3_2`
+* `ARKODE_KVAERNO_4_2_3`
+* `ARKODE_CASH_5_2_4`
+* `ARKODE_CASH_5_3_4`
+* `ARKODE_KVAERNO_5_3_4`
+* `ARKODE_KVAERNO_7_4_5`
+
 The default value of `CMAKE_CUDA_ARCHITECTURES` is no longer set to `70` and is
 now determined automatically by CMake. The previous default was only valid for
 Volta GPUs while the automatically selected value will vary across compilers and

diff --git a/doc/arkode/guide/source/Butcher.rst b/doc/arkode/guide/source/Butcher.rst
@@ -1407,12 +1407,12 @@ Here, the higher-order embedding is less stable than the lower-order method
 
    \renewcommand{\arraystretch}{1.5}
    \begin{array}{r|ccc}
-     0.292893218813 & 0.292893218813 & 0 & 0 \\
-     1.091883092037 & 0.798989873223 & 0.292893218813 & 0 \\
-     1.292893218813 & 0.740789228841 & 0.259210771159 & 0.292893218813 \\
+     1 - \frac{1}{\sqrt{2}} & 1 - \frac{1}{\sqrt{2}} & 0 & 0 \\
+     \frac{27}{\sqrt{2}} - 18 & 14 \sqrt{2} - 19 & 1 - \frac{1}{\sqrt{2}} & 0 \\
+     2 - \frac{1}{\sqrt{2}} & \frac{53 - 5 \sqrt{2}}{62} & \frac{9 + 5 \sqrt{2}}{62} & 1 - \frac{1}{\sqrt{2}} \\
      \hline
-     2 & 0.740789228840 & 0.259210771159 & 0 \\
-     3 & 0.691665115992 & 0.503597029883 & -0.195262145876
+     2 & \frac{53 - 5 \sqrt{2}}{62} & \frac{9 + 5 \sqrt{2}}{62} & 0 \\
+     3 & \frac{263 - 95 \sqrt{2}}{186} & \frac{47 + 33 \sqrt{2}}{186} & \frac{\sqrt{2} - 2}{3}
    \end{array}
 
 .. figure:: /figs/arkode/stab_region_12.png

diff --git a/doc/shared/RecentChanges.rst b/doc/shared/RecentChanges.rst
@@ -2,6 +2,20 @@
 
 **New Features and Enhancements**
 
+The following DIRK schemes now have coefficients accurate to quad precision:
+
+* ``ARKODE_BILLINGTON_3_3_2``
+
+* ``ARKODE_KVAERNO_4_2_3``
+
+* ``ARKODE_CASH_5_2_4``
+
+* ``ARKODE_CASH_5_3_4``
+
+* ``ARKODE_KVAERNO_5_3_4``
+
+* ``ARKODE_KVAERNO_7_4_5``
+
 The default value of :cmakeop:`CMAKE_CUDA_ARCHITECTURES` is no longer set to
 ``70`` and is now determined automatically by CMake. The previous default was
 only valid for Volta GPUs while the automatically selected value will vary