# How to create a shaking container

Hi,

I'm trying to set up a shaking container (cylinder) of fluid using DualSPHysics. I created a volume with min (-0.05,-0.05,-0.5) max (0.25, 0.25, 0.5) containing a cylinder of radius 0.04 and points (0.05, 0.05, 0.0), (0.05, 0.05, 0.08), and used a fillbox to create some fluid inside the container:

```                  <setshapemode>actual | dp | bound</setshapemode>
<setmkbound mk="0" />
<setdrawmode mode="face" />
<point x="0.05" y="0.05" z="0.0" />
<point x="0.05" y="0.05" z="0.08" />
</drawcylinder>
<setmkfluid mk="0" />
<fillbox x="0.05" y="0.05" z="0.015" objname="FillBox">
<modefill>void</modefill>
<point x="0" y="0" z="0" />
<size x="0.1" y="0.1" z="0.031" />
</fillbox>
```

I tried to apply a sinusoidal rectilinear motion to the boundary particles to make them "shake", but I think I'm misunderstanding how the motion works. I tried this motion type:

```        <motion>
<objreal ref="0">
<begin mov="1" start="0" />
<mvrectsinu id="1" duration="1.0" anglesunits="degrees" next="1">
<freq x="0.0" y="0.0" z="1.0" units_comment="1/s" />
<ampl x="0.0" y="0.0" z="0.0001" units_comment="metres (m)" />
<phase x="0.0" y="0.0" z="0.0" units_comment="degrees" />
</mvrectsinu>
</objreal>
</motion>
```

which my understanding would result in a shake with frequency 1 Hz and a maximum amplitude of 0.0001m/s^2, which I think should also result in a maximum displacement of 0.0001m (well within the bounds of 0.5 in the z axis).

When I run this case, after 0.07120s simulation time the simulation halts with the error:

```Excluded for: position=20073  rhop=0  velocity=0
Some boundary particle exceeded the +Z limit (top limit) of the simulation domain.*** Exception (JSphCpuSingle::AbortBoundOut)
Text: Fixed, moving or floating particles were excluded. Check VTK file Error_BoundaryOut.vtk with excluded particles.
```

which suggests somehow some of the boundary particles make it outside the domain super quickly, and I can't understand why. Is there something wrong with my motion understanding (or boxsize or something) that makes this go wrong?