# I have a scenario

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 October 18, 2001, 20:14 I have a scenario #1 Pandu Sattvika Guest   Posts: n/a Hi guys, I have an interesting cfd modeling problem which is not mine officially yet, but I need some ideas/inputs before I actually do this. Anyway here is the problem. We have 2 liquid, say A and B. Liquid A travels a fairly long tube at given velocity, Re, etc. At time zero we start switching the liquid A with liquid B at the source. Liquid A and Liquid B are miscible, so at some point a long the tube we will have --------------------------------------------------- Liquid B---+------Mixing Zone----+---Liquid A ----> --------------------------------------------------- Provided adequate information, I want to model how this "Mixing Zone" forms a lon the tube and thus I need the general input from you guys on how to set up the problem in CFD. I need to know how "hard" it is to set up this kind of problem. Thank you guys Pandu

 October 19, 2001, 13:10 Re: I have a scenario #2 Robin Steed Guest   Posts: n/a Hi Pandu, This is a relatively easy problem to setup. Starting from a converged steady state solution (representing time 0 s), you will run a transient simulation (second order transient preferably), with a transient boundary condition (or a new b.c. if it is a step change from A to B). Exaclty how to do this will depend on the code you are running. Regards, Robin

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