[South P]

Hello!

This is my first post on this forum.

I am new to CFD and struggling on all different errors. Thanks for many kind people who shared their experience and knowledge in this forum, I managed to overcome those errors, but this time, I couldn't find similar case so I am writing one.

I am modeling a small tunnel, I set the entrance of the tunnel to velocity inlet(user defined profile), and I set the exit of the tunnel to pressure out. there is chemical reaction in the centre of the tunnel so CO will spread out to the both ends. But, The velocity from the velocity inlet isn't large enough to restrain the diffusion of CO, so CO will slowly move towards velocity inlet and will be spreaded out of velocity inlet.

I know the velocity inlet should be located 'at the end of fluid zone' but I want to know how the diffusion of CO behaves after it passes the enterance of the tunnel.

My english is not good so I drew the scheme of the modelling I am working on.


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http://blog.daum.net/kakao6184/2

Any advice will be very much appreciated!