add gallery granRT and SingBuB

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        <header class="major">

          <h2>Boyce Single Bubble</h2>

          <p>Qualitative Benchmarking: Single bubble injection</p>

        </header>

        <div class="row 50% uniform">

          <div class="4u 12u(small)">

            <center>

              <iframe src="https://widgets.figshare.com/articles/10299065/embed?show_title=0" 

               width="250" height="310" allowfullscreen="true" frameborder="0"></iframe>

            </center>

          </div>

          <div class="8u$ 12u(small)">

            Recent <a href="https://doi.org/10.1016/j.ces.2019.01.047">experiments</a>

            by C.M. Boyce and coworkers considers the rapid, high-speed injection 

            of a single bubble into an incipiently fluidized bed. Here, the 50 m/s jet is turned on 

            for 150 ms causing a single large bubble to form, rise through the 3 mm particle bed and

            erupt a the surface. <a href="https://ovito.org">Ovito</a> animaiton shows particles in 

            the center 10 mm thick slice of the 190 mm diameter bed, colored by their vercial 

            velocity ranging from -0.3 m/s (black) to 1.0 m/s (white). 

            Simulation models 260K particles with MFiX-Exa 19.08 using 32 CPU cores.

            <p><p>

            Animation courtesy William D. Fullmer,

            <a href="https://mfix.netl.doe.gov">Multiphase Flow Science Group</a>,

            NETL, Morgantown WV.

            </p>

          </div>

        </div>

        <p>

        <header class="major">

          <h2>Granular Rayleigh-Taylor</h2>

          <p>Qualitative Benchmarking: Gravitational granular flow instability</p>

        </header>

        <div class="row 50% uniform">

          <div class="8u 12u(small)">

            The "granular" variant of the classical RT instability superimposes an assemply of 

            1.12M random loose packed particles over air. The instability finger/bubble pattern 

            which reaches a (statistical) equilibrium between coarsening via finger merging and 

            refinement via bubble splitting. Black and white <a href="https://ovito.org">ovito</a> 

            animation shows particle location.

            Simulation performed with MFiX-Exa 19.08 238 16 CPU cores.

            <p><p>

            Animation courtesy of William D. Fullmer,

            <a href="https://mfix.netl.doe.gov">Multiphase Flow Science Group</a>,

            NETL, Morgantown WV.

            </p>

          </div>

          <div class="4u$ 12u(small)">

            <center>

              <iframe src="https://widgets.figshare.com/articles/10299014/embed?show_title=0" 

               width="250" height="310" allowfullscreen="true" frameborder="0"></iframe>

            </center>

          </div>

        </div>

        <p>

        <header class="major">

          <h2>Mehrdad's Bed</h2>