Surface ships and submarines emit noise. An important component of this noise is flow induced and consists of noise from the propulsor, boundary layer and vortices. The computer capacity of today and computational fluid dynamic codes can be used to compute the flow field (boundary layer and vortices) around vehicles with acceptable accuracy in model scale, but the resolution is not yet sufficient for reliable results in full scale. Methods for computation of the acoustic far field from a known acoustic source exist, but to compute the acoustic source term from fluid dynamic simulations is not easy as we cannot afford to compute all details of the flow field. The acoustic source term has traditionally been based on empirical models. Within the framework of this project, a source model has been derived from analysis of the fluid dynamic equations. By means of different assumptions during the derivation, different models for the acoustic source term can be obtained. FOI is neither first nor alone to do this, during the past few years other groups have done this, but this is the first time source modeling from fluid dynamic computations are coupled to acoustic propagation at FOI. Since this project attempts to combine the knowledge from two different areas, computational fluid dynamics and acoustics, this report comprises results, as well as a presentation of basic theories in both areas. This is done to provide non-experts with a basic understanding for the issues in these areas.