http://www.wiki.mohid.com/index.php?action=history&feed=atom&title=RelaxationRelaxation - Revision history2026-04-04T20:17:40ZRevision history for this page on the wikiMediaWiki 1.28.0http://www.wiki.mohid.com/index.php?title=Relaxation&diff=812&oldid=prevGuillaume: 1 revision2008-12-03T10:39:03Z<p>1 revision</p>
<table class="diff diff-contentalign-left" data-mw="interface">
<tr style='vertical-align: top;' lang='en'>
<td colspan='1' style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan='1' style="background-color: white; color:black; text-align: center;">Revision as of 10:39, 3 December 2008</td>
</tr><tr><td colspan='2' style='text-align: center;' lang='en'><div class="mw-diff-empty">(No difference)</div>
</td></tr></table>Guillaumehttp://www.wiki.mohid.com/index.php?title=Relaxation&diff=811&oldid=prev192.168.23.108 at 12:01, 30 November 20072007-11-30T12:01:48Z<p></p>
<p><b>New page</b></p><div>Relaxation schemes are used in [[MOHID Water]] to relax computed solutions to a reference solution. The standard method follows the equation: <br />
<br />
<math> \frac{\partial \phi}{\partial t} = \frac{ \phi_{ref} - \phi}{\tau}</math><br />
<br />
where <math>\phi</math> is the relaxed variable, <math>\phi_{ref}</math> is the reference solution and <math>\tau</math> relaxation time scale. <br />
<br />
In MOHID Water, the reference fields and the relaxation time scales are read and handled by [[Module Assimilation]]. The relaxation algorithm itself is implemented in [[Module Hydrodynamic]] and [[Module WaterProperties]] to apply the relaxation scheme to properties such as velocity U, velocity V, water level, temperature, salinity, etc. It is normally applied in the boundary condition computation, usually when [[nesting models]] or using a climatological reference field, via the definition of a "sponge layer" around the open boundary. However it can also be applied to the entire simulation domain.<br />
<br />
<br />
[[Category: MOHID Water]]</div>192.168.23.108