Reply To: Simulating flow through many small pumping objects

[Rob]

There were more than two threads.... 

If you're assuming the mussels are as above then single units may be OK. Think about the cell count you'd need to resolve each shell & opening, then multiply up to the whole domain. Porous media is covered in the User's Guide (click on Help in Fluent) as are source terms: both are cell zone conditions.