[cig-commits] r19751 - in short/3D/PyLith/branches/v1.6-stable: . doc/releasenotes
brad at geodynamics.org
brad at geodynamics.org
Thu Mar 8 13:52:12 PST 2012
Author: brad
Date: 2012-03-08 13:52:11 -0800 (Thu, 08 Mar 2012)
New Revision: 19751
Modified:
short/3D/PyLith/branches/v1.6-stable/README
short/3D/PyLith/branches/v1.6-stable/doc/releasenotes/announce_v1.6.3.txt
Log:
Fixed typos in release announcement. Added release notes to README.
Modified: short/3D/PyLith/branches/v1.6-stable/README
===================================================================
--- short/3D/PyLith/branches/v1.6-stable/README 2012-03-08 21:32:19 UTC (rev 19750)
+++ short/3D/PyLith/branches/v1.6-stable/README 2012-03-08 21:52:11 UTC (rev 19751)
@@ -70,6 +70,74 @@
models.
----------------------------------------------------------------------
+Version 1.6.3
+----------------------------------------------------------------------
+
+* Bug fixes
+
+ - Improved error messages for problems encountered during processing
+ of parameters. A backtrace of the object hierarchy is now included
+ to pinpoint in which object the error occurred.
+
+ - Added a line search to the inner friction solve in quasi-static
+ simulations to increase the robustness of the nonlinear
+ solve. Simulations using rate and state friction now converge
+ under a much wider range of circumstances.
+
+ - Fixed bug in updating slip state variable in slip-weakening
+ friction. This caused slight errors in the cumulative slip. We
+ also added a parameter that forces healing to occur in a single
+ time step. This is used to confine slip to a single time step in
+ quasi-static simulations. See examples/3d/hex8/step13.cfg for an
+ example.
+
+ - Tuned parameters in the slip-weakening friction and rate and state
+ friction examples (step13.cfg and step14.cfg, respectively) in
+ examples/3d/hex8 to give stick-slip behavior.
+
+ - Fixed communication issue associated with writing boundary
+ condition information output in parallel.
+
+ - Changed info in Xdmf file for fields that are not scalars,
+ vectors, or tensors so that the each component is extracted,
+ facilitating visualization in ParaView. The corresponding HDF5
+ file remains the same.
+
+ - Added the ability to specify non-derived units (e.g., degree and
+ radian). This is useful in specifying parameters for the
+ Drucker-Prager elastoplastic rheologies. If no units are
+ specified, radians are assumed.
+
+* Internal changes
+
+ - Rate and state friction with ageing law
+
+ The implementation of rate and state friction with ageing law was
+ modified to work better with the iterative solver. We switched to
+ the conventional, unregularized formulation but added a minimum
+ cutoff for the slip rate. Below this cutoff friction has a linear
+ rather than logarithmic dependence on slip rate. As long as this
+ cutoff is close to the SNES solver tolerance, the difference in
+ behavior is negligible while improving the ability of the solver
+ to converge for very small deformations.
+
+KNOWN ISSUES
+
+ The rate and state friction with ageing law has not been tested for
+ dynamic rupture simulations. We plan to run the SCEC Dynamic Rupture
+ benchmarks for rate and state friction as soon as we add a
+ spatial-temporal specification of initial fault tractions, which are
+ required for the benchmark problems.
+
+ Running simulations with more than a million cells and large faults
+ in parallel can result in severe memory imbalances among
+ processors. Some processors around the fault may use 10x more memory
+ than processors away from the fault. We expect this problem to
+ disappear in v1.7 when we switch to new, more efficient Sieve
+ implementation.
+
+
+----------------------------------------------------------------------
Version 1.6.2
----------------------------------------------------------------------
Modified: short/3D/PyLith/branches/v1.6-stable/doc/releasenotes/announce_v1.6.3.txt
===================================================================
--- short/3D/PyLith/branches/v1.6-stable/doc/releasenotes/announce_v1.6.3.txt 2012-03-08 21:32:19 UTC (rev 19750)
+++ short/3D/PyLith/branches/v1.6-stable/doc/releasenotes/announce_v1.6.3.txt 2012-03-08 21:52:11 UTC (rev 19751)
@@ -21,9 +21,9 @@
* Bug fixes
- - Improved error messages for problems encountered during
- configuration. A backtrace of the object hierarchy is now included
- to pinpoint in which object the rror occurred.
+ - Improved error messages for problems encountered during processing
+ of parameters. A backtrace of the object hierarchy is now included
+ to pinpoint in which object the error occurred.
- Added a line search to the inner friction solve in quasi-static
simulations to increase the robustness of the nonlinear
@@ -35,7 +35,7 @@
also added a parameter that forces healing to occur in a single
time step. This is used to confine slip to a single time step in
quasi-static simulations. See examples/3d/hex8/step13.cfg for an
- exanple.
+ example.
- Tuned parameters in the slip-weakening friction and rate and state
friction examples (step13.cfg and step14.cfg, respectively) in
@@ -47,7 +47,7 @@
- Changed info in Xdmf file for fields that are not scalars,
vectors, or tensors so that the each component is extracted,
facilitating visualization in ParaView. The corresponding HDF5
- file does not change.
+ file remains the same.
- Added the ability to specify non-derived units (e.g., degree and
radian). This is useful in specifying parameters for the
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