Can i have some notes on FEM & FDM?

I'm working at a University where we are developing and running interface software for CFD simmulations. There are no CFD specialists in my lab, however, so we get the information we need from a couple of other labs around campus.

Unfortunately, no one seems to know what the CFL number is, or how to use it.

Can I just get a simple explanation of the CFL number and a general range in which it should lie?

Thank you! 

I wanna simulate the penetration of the slurry into soil when TBM is used to construct tunnel.  Although much more research has been done by experiments,I wanna use CFD to simulate the process which can make it more common and efficient.

For it is very similar to filtration cake physically,I would like to use some results by this.But it is very difficult to sumulate it by the software ANSYS CFD.

Is there some guy who have tried is field?Any suggestion will be appreciated!

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