Dear Xiaochuan,

We have been using CFD-ACE+ package of Computational Fluid Dynamics Research
Corporation (CFDRC) for design and optimization of microfluidic devices.
It is the best package I can recommend you in microfluidics area.
The geometry and mesh generation tool (CFD-GEOM) is very easy and flexible in
use as well as data visualization package (CFD-VIEW).
The solver part (CFD-ACE) itself is very powerful allowing you to simulate all
sorts of problems in microfluidics from channel flow through droplet ejection
tofluid-structure interaction and stress problems in solids (CFD-FEMSTRESS).
Everything (geometry and grid generation, solving, data visualisation) is
seamless and very easy to use.

Their software has been successfully used to simulate all sorts of microfluidic
devices such as micropumps, inkjet printheads, fluidic amplifiers, mixers and
others.

To my best knowledge they are leading company in microfluidics-modeling
softwaremarket and are mentioned in all major mems-simulation related sites on
the
internet.
Their web page address is:  www.cfdrc.com


Best regards,

Andrzej