The simulation of geodynamical processes is often done numerically, because it is possible to simulate large periods of time in a reasonable time and thus understand formation or evolutionary processes. However, along with numerical simulation come some difficulties, for instance the right choice of spatial or temporal resolution. Non recognised numerical artefacts might look like reasonable results and thus lead to incorrect conclusions. A laboratory experiment is a good possibility to check on the model assumptions. We are building an experimental setup, containing a large tube, which will be filled with liquid (water, glycerol, oil, honey). In the near future we will do a number of test with objects falling in this tube.