source terms and mixing in CFX
 

I am currently using CFX, the problem is that I have a cylinderical vessel with two inlets (say inlet1 and inlet2) and an outlet. My supervisor wants me to find the mean residence time of the vessel, and the way he does it in Fluent is that when the fluid from inlet1 carrying species 1 enters the vessel it transforms itself into species 3 at a constant rate, inlet2 is carrying species2. So that the longer the time species1 stays in the reactor the more concentration of species3 it is going to produce. Species 2 is inert. So you end up so a plot of mass fractions of each of the species, in a sense showing areas of the vessel where species1 (from inlet1) is stagnant and where it is not mixing well.

apparently I am meant to use some source terms but being new to CFX I am not sure how the subroutine works or how I am meant to alter it. I was wondering if your expertise could shed somelight on my situation, I think the subroutine is called USRSRC

I would greatly appreciate any help

Re: source terms and mixing in CFX
 

Dear Timothy Pau

Please check out the following CFX user subroutine archieve which contains several useful user fortran files including "USRSRC.f". Click the icon!!

http://bgtibm1.me.uiuc.edu/people/d-...subroutine.gif

Plus, some lecture material written by Simon Lo would help your understanding. Please contact CFX agent.

Regards, Hyun S. Lee

Re: source terms and mixing in CFX
 

hi,

I am trying to simulate a flow field with multiple gas injections inside the domain. More specifically, primary gas is injected from bottom INLET; secondary gas is injected at several points in the flow domain.

Is it possible to only use the commond lines to implement the simulation using CFX4.3?

Thanks in advance.

Yi

Re: source terms and mixing in CFX
 

Forget this post. I solved it aleady.