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July 8, 2013, 09:35 |
Eulerian VOF method-outlet boundary?????
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Member
sajeesh
Join Date: Feb 2013
Posts: 52
Rep Power: 13 |
Hi
I am doing a 2D simulation for the movement of a water droplet having Diameter 25 micrometer through a channel of cross scetion 50 micro X 500 micro.. Using Eulerian VOF coupled method to explicitly define the velocity of droplet and oil phase I patch the droplet phase and assign a volume fraction of 1 to that water droplet patched region I am using transient case with double precision Oil as primary phase and secondary phase as droplet scheme: phase coupled SIMPLE gradient : Least sqaure method Momentum : first order upwind volume fraction: geo construct Inlet BC: velocity for oil and droplet volume fraction zero and droplet velocity also at inlet when i am using Outlet boundary condition I have to define the back flow volume fraction. initially If i give the back flow fraction as 0 the simulation running fine and give the correct tracking of interface also For me i want to eject the droplet from the exit.But by this condition after the simulation the droplet is stuck at exit.solution gets stopped by the high courant number Similarly i tried with outflow BC.at that time also simulation perfect upto reaching the outlet then again the simulation stopped and the droplet is not going out. When i tried outlet boundary condition with back flow volume fraction of droplet as 1 it is showing error ->Solution diverging ..velocity diverging .Global courant number more than 250.. Please help me to eject the droplet from the channel during simulation.For that what BC should i give at outlet... My email ID sajeeshperil@gmail.com Thanking You sajeesh |
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