[cig-commits] r15550 - short/3D/PyLith/trunk/doc/releasenotes

[brad at geodynamics.org]

Author: brad
Date: 2009-08-17 11:53:29 -0700 (Mon, 17 Aug 2009)
New Revision: 15550

Added:
   short/3D/PyLith/trunk/doc/releasenotes/announce_v1.4.2.txt
Log:
Added draft of release announcement for v1.4.2.

Added: short/3D/PyLith/trunk/doc/releasenotes/announce_v1.4.2.txt
===================================================================
--- short/3D/PyLith/trunk/doc/releasenotes/announce_v1.4.2.txt	                        (rev 0)
+++ short/3D/PyLith/trunk/doc/releasenotes/announce_v1.4.2.txt	2009-08-17 18:53:29 UTC (rev 15550)
@@ -0,0 +1,51 @@
+Greetings,
+
+I am pleased to announce the release of PyLith 1.4.2, a finite-element
+code designed to solve dynamic elastic problems and quasi-static
+viscoelastic problems in tectonic deformation.
+
+This release fixes several bugs that in the v1.4.0 and v1.4.1
+releases, including (1) parameters in the power-law rheology are now
+consistent with laboratory experiments, (2) fixed implementation
+errors in point forces, (3) increased the stable time step for
+implicit time-stepping with linear viscoelastic models from 0.1 times
+the Maxwell time to 0.2 times the Maxwell time based on accuracy
+tests, and (4) eliminated several memory leaks associated with output
+and running in parallel.  
+
+We strongly recommend all users of previous PyLith releases to switch
+to this latest release. Switching from v1.4.0 or v1.4.1 to v1.4.2 only
+requires changes to parameter files when using adaptive time stepping
+with a non-default stability factor (see the release notes below for
+details). See the README file for changes required to switch to the
+v1.4.x release series from previous versions.
+
+You can download the source code and binaries from
+
+    http://geodynamics.org/cig/software/packages/short/pylith
+
+Detailed installation instructions are in the User Manual with example
+installation procedures for a few platforms in the bundled doc/install
+directory.
+
+
+RELEASE NOTES
+
+ * Bug fixes
+
+  - Parameters for the power-law rheology are now consistent with the
+    parameters often reported in laboratory experiments. This should
+    make it easier to use values from laboratory experiments. See the
+    user manual for details.
+
+  - Numerous errors in the Python and SWIG point source implementation
+    were fixed. Point forces did not work in v1.4.1.
+
+  - Based on accuracy tests the stable time step for implicit
+    time-stepping for the Maxwell viscoelastic models has been
+    increased to 0.2 times the Maxwell time. The default stability
+    factor in the adaptive time-stepping has been corresponding
+    adjusted to provide a time step of 0.1 times the Maxwell time.
+
+  - Several memory leaks associated with output and running in
+    parallel have been fixed.