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From greve at lowtem.hokudai.ac.jp  Mon Nov 12 08:42:00 2018
From: greve at lowtem.hokudai.ac.jp (Ralf Greve)
Date: Mon, 12 Nov 2018 16:42:00 +0900
Subject: [SICOPOLIS:67] Manual configuration vs. GNU Autotools
Message-ID: <504f955a-83e9-79ad-d02d-2081e196a8df@lowtem.hokudai.ac.jp>

Dear colleagues,

coming back to my mail of 31 October [SICOPOLIS:66]:

For the time being, I have kept the build option with GNU Autotools in 
the code. However, I have changed the default to manual configuration. 
This means for the new versions of the shell scripts sico.sh, 
multi_sico_1/2.sh and tools.sh (revision 1370):

* Default is manual configuration rather than build by GNU Autotools.
* Option -z for choosing manual configuration can still be used, but
   it is redundant.
* New option -u for choosing GNU Autotools build introduced.

As always, the version-controlled scripts are placed in the templates 
subdirectories of sicopolis/runs and sicopolis/tools. Please merge them 
with your versions in the main directories. If you haven't changed 
anything, simply copying them is of course fine.

I have also updated the Quick Start Manual such that it explains the new 
options (revision 1371).

Best regards,

Ralf

-- 
Dr. Ralf Greve
Professor, Glacier and Ice Sheet Research
Institute of Low Temperature Science
Hokkaido University
Kita-19, Nishi-8, Kita-ku
Sapporo 060-0819, Japan
Phone: (+81)-(0)11-706-6891
greve at lowtem.hokudai.ac.jp
http://wwwice.lowtem.hokudai.ac.jp/~greve/

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From greve at lowtem.hokudai.ac.jp  Mon Nov 19 11:56:39 2018
From: greve at lowtem.hokudai.ac.jp (Ralf Greve)
Date: Mon, 19 Nov 2018 19:56:39 +0900
Subject: [SICOPOLIS:68] Stability of the SSA/SStA solver
Message-ID: <340b8f93-5732-6640-9c69-a3a444ec5d10@lowtem.hokudai.ac.jp>

Dear colleagues,

the recent revisions 1376 and 1377 are very beneficial for the numerical 
stability of the SSA/SStA (shallow-shelf/shelfy-stream) solver.

The important change is that the limiter for the horizontal velocity 
(parameter VH_MAX) is now applied after each nonlinear iteration, 
whereas previously, it was applied only once after all iterations. The 
new method keeps unrealistic speeding of some isolated areas very 
efficiently under control and thus helps keeping the iterations stable. 
Therefore, I recommend to update.

Best regards,

Ralf

-- 
Dr. Ralf Greve
Professor, Glacier and Ice Sheet Research
Institute of Low Temperature Science
Hokkaido University
Kita-19, Nishi-8, Kita-ku
Sapporo 060-0819, Japan
Phone: (+81)-(0)11-706-6891
greve at lowtem.hokudai.ac.jp
http://wwwice.lowtem.hokudai.ac.jp/~greve/

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