We propose that the research will be performed by two Phd Students one of them will focus on the computations and the other will focus on the experiments. The first step in the research will be to design and build an experimental setup, which is accessible for optical measurement techniques and which has a geometry which can be simulated easily and efficiently, i.e. a geometry which computationally can be handled without the use of complicated (read unstructured) grids. Once the exact configuration has been chosen, the available numerical methods can be adjusted to this geometry and the experimental setup can be build. The next step will be to perform measurements and computations for the range of Reynolds numbers discussed before. The acoustic sources obtained from the experiment, i.e. basically the non-linear advection term in the Lighthill equation, will be compared with the results from the simulation. Furthermore, the acoustic fields obtained from experiment and computation have to be compared. The experiment can also be used to model the sound in the forward direction of the jet, for instance by using a convective wave equation or another acoustic analogon, see for instance Goldstein (1974). Once this validation has been performed we would like to investigate the effect of a solid wall parallel to the jet, both computationally and experimentally.