[web] Added a short description about the DECOCALEX-THMC based benchmark

Documentation/bibliography.bib

@@ -143,4 +143,13 @@
   doi = "https://doi.org/10.1016/j.cma.2011.02.011",
   url = "https://www.sciencedirect.com/science/article/pii/S0045782511000466",
   author = "Kim, J. and Tchelepi, H.A. and Juanes, R"
+}
+
+@TECHREPORT{BirEtAl:2008,
+    author = "Birkholzer, J. and Rutqvist, J. and Sonnenthal, E. and Barr, D.",
+    title = {DECOVALEX-THMC Project, Task D: Long-term permeability/porosity changes in the EDZ and near field due to THM and THC processes in volcanic and crystalline-bentonite systems},
+    institution = {SKI},
+    address     = {Stockholm},
+    number      = {2008:45},
+    year = 2008
 }
\ No newline at end of file

web/content/docs/benchmarks/hydro-thermal/decovalex-TH.md

++++
+project = "Parabolic/HT/StaggeredCoupling/ADecovalexTHMCBasedHTExample/th_decovalex.prj"
+author = "Wenqing Wang"
+date = "2018-02-13T12:42:53+01:00"
+title = "An example of the coupled thermal hydraulic processes in the FEBEX type repository"
+weight = 161
+
+[menu]
+  [menu.benchmarks]
+    parent = "hydro-thermal"
+
++++
+
+{{< data-link >}}
+
+## Problem description
+
+This example is based on the The TASK D_THM1 of the DECOVALEX-THMC project.
+The TASK D_THM1 of the DECOVALEX-THMC project studies the coupled thermal hydraulic
+ and mechanical (THM) processes in the FEBEX type nuclear waster repository.
+ In the FEBEX type repository, nuclear waster canisters are stored in the
+ drifts excavated in the deep rock mass of granite, which is fully water
+ saturated, and they are sealed with bentonite. Initiallly, the betonite,
+ the sealing material, is partially saturated. TASK D_THM1 defines a 2D model
+ about the FEBEX type repository \cite BirEtAl:2008. In this example,
+ TASK D_THM1 is simplified in order to test the staggered scheme for TH process
+ in ogs6. The simplifications are
+<ol>
+<li><p>resizing the domain to an area that can represent the near field of an
+ installed nuclear water canister,</p></li>
+<li><p>assuming the the betonite is fully saturated from the beginning,</p></li>
+<li><p>ignoring the mechanical process.</p></li>
+</ol>
+<p>With such simplifications, the geometry of the present example is illustrated
+ in the following figure:</p>
+{{< img src="../decovalex_TH_domain.png" >}}
+<p>In the above figure, the domain in the annulus sector represents the sealing
+ material, bentonite. A heat power, which is generated by the nuclear waste with
+ one million year variation, is applied onto the inner arc of the annulus
+ sector. On the top boundary, the boundary conditions are
+ <span class="math inline"><em>p</em> = 4.3 ⋅ 10<sup>6</sup></span> Pa,
+ <span class="math inline"><em>T</em> = 294</span> K.
+ While on the bottom boundary, the boundary conditions are set as
+ <span class="math inline"><em>p</em> = 4.7 ⋅ 10<sup>6</sup></span> Pa,
+ <span class="math inline"><em>T</em> = 310</span> K.
+ The initial conditions are given as
+ <span class="math inline"><em>p</em> = 4.7 ⋅ 10<sup>6</sup></span> Pa,
+ <span class="math inline"><em>T</em> = 298</span> K.</p>
+<p>The material properties are shown in the following table:</p>
+<table>
+<caption>Material properties</caption>
+<thead>
+<tr class="header">
+<th align="left">Property</th>
+<th align="left">Value</th>
+<th align="left">Unit</th>
+</tr>
+</thead>
+<tbody>
+<tr class="odd">
+<td align="left"><em>Bentonite</em></td>
+<td align="left"></td>
+<td align="left"></td>
+</tr>
+<tr class="even">
+<td align="left">Density</td>
+<td align="left"><span class="math inline"><em>k</em><em>g</em>/<em>m</em><sup>3</sup></span></td>
+<td align="left">1600</td>
+</tr>
+<tr class="odd">
+<td align="left">Porosity</td>
+<td align="left">-</td>
+<td align="left">0.01</td>
+</tr>
+<tr class="even">
+<td align="left">Thermal conductivity</td>
+<td align="left"><span class="math inline"><em>W</em>/(<em>m</em><em>K</em>)</span></td>
+<td align="left">3</td>
+</tr>
+<tr class="odd">
+<td align="left">Specific heat capacity</td>
+<td align="left"><span class="math inline"><em>J</em>/(<em>k</em><em>g</em><em>K</em>)</span></td>
+<td align="left">3</td>
+</tr>
+<tr class="even">
+<td align="left">Saturated permeability</td>
+<td align="left"><span class="math inline"><em>m</em><sup>2</sup></span></td>
+<td align="left"><span class="math inline">2.0 ⋅ 10<sup>−21</sup></span></td>
+</tr>
+<tr class="odd">
+<td align="left"><em>Granite</em></td>
+<td align="left"></td>
+<td align="left"></td>
+</tr>
+<tr class="even">
+<td align="left">Density</td>
+<td align="left"><span class="math inline"><em>k</em><em>g</em>/<em>m</em><sup>3</sup></span></td>
+<td align="left">2700</td>
+</tr>
+<tr class="odd">
+<td align="left">Porosity</td>
+<td align="left">-</td>
+<td align="left">0.41</td>
+</tr>
+<tr class="even">
+<td align="left">Thermal conductivity</td>
+<td align="left"><span class="math inline"><em>W</em>/(<em>m</em><em>K</em>)</span></td>
+<td align="left">3</td>
+</tr>
+<tr class="odd">
+<td align="left">Specific heat capacity</td>
+<td align="left"><span class="math inline"><em>J</em>/(<em>k</em><em>g</em><em>K</em>)</span></td>
+<td align="left">900</td>
+</tr>
+<tr class="even">
+<td align="left">Saturated permeability</td>
+<td align="left"><span class="math inline"><em>m</em><sup>2</sup></span></td>
+<td align="left"><span class="math inline">10<sup>−17</sup></span></td>
+</tr>
+</tbody>
+</table>
+
+## Solution
+<p>As the reference results, the temperature and pressure distributions in the
+ domain at the time of 18 years are shown in the following figure, in which the
+ thermal convection effective can be seen clearly.</p>
+
+{{< img src="../decovalex_TH_domain_pT.png" >}}
+
+## Reference
+
+{{< bib id="BirEtAl:2008" >}}