ADDITIONAL VARIABLES LIMITERS

N.P

Dear CFX users,

I am using 2 additional variables in CFX-10 and i am solving them as transport equations. I would like to apply lower limits on them so that i.e.

NumberDensity >= 1 (#/m3) and Area >= Area of a single particle i.e. 5e-19 (m2/m3)

Is there a way that i can do something like that in CEL ? I have tried to use the step function and multiply it with the negative source terms of those 2 variables but it had no effect (as the actual problem is because them 2 variables are transported and hence the software needs something to tell it what are the limims for those variables.)

Do i have to use user Fortran? If thats the case could you please provide me with an example as it will be impossible to find out on my own how to do this.

Cheers, NP