Some support for dolfyn (a free cfd code) was provided by Runar Tenfjord.
In the CalculiX/cgx_(nr)/examples/dolfyn directory is a patch for the dolfyn source-code included. This patch enables dolfyn to write frd-result files which can be visualized with cgx. There is also an example which allows cgx to be used as an pre-processor for dolfyn. The mesh can be written in dolfyn format with the command ''send''.