wdf test add mehrdads bed

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          <h2>Mehrdad's Bed</h2>

          <p>Qualitative Benchmarking: Ordered bubbling via periodic fluidization</p>

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            Typical random bubbling patterns under uniform fluidization can be driven to ordered 

            states under periodic fluidization. At certain system sizes and conditions, a regular 

            <a href="https://doi.org/10.1016/j.powtec.2018.06.049">left-right alternating single 

            bubble pattern</a> can be achieved. The animation, rendered in 

            <a href="https://www.blender.org">Blender</a>, shows time 10s to 15s played back at 

            1/4x speed. Simulation considers 166k particles run with MFiX Exa 19.08 using 32 CPU 

            cores.

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            Animation courtesy of Justin Weber & wdf, 

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

            NETL, Morgantown WV. 

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