CAESES is capable of geometry preprocessing which includes e.g. to convert an surface model (IGES) into an surface-meshed model (STL -- represented by trimeshes or solids within the software) and CAE results postprocessing, but it does not include an CFD code, no volume mesher and no CFD-preprocessing such as applying boundary condtions. These steps have to be done in a another software (OpenFOAM + Snappy Hex Mesh, STAR-CCM+, ...).
If you have a surface geometry available (although your screenshot above looks like a single object -- already a STL geometry I guess) you can mesh the surface in CAESES. For the meshing you can apply e.g. different colors to the inlet patches and the outlet patch. Then you can export your geometry as colored STL which will help you to easily apply different boundary conditions to the different patches.
The general approach is to set up a software connector in CAESES, pass your surface mesh geometry to the external mesher and CFD code and receive the results after the CFD run. Then you can postprocess them using CAESES again. If you have a parametric geometry or if you want to run different cases (e.g. flow speeds, pressures, ...) you can use CAESES to compare and analyse all the results in an easy and smart way. The tutorials "Basic Preprocessing" and "External Software" will teach you this procedure.
I hope this helps a bit. If you have further questions do not hesitate to ask. Furthermore I would be happy if you could share some more information. Which CFD code you want to use/ you have available? Can you share your geometry? ...