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Discretization Scheme

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Old   August 31, 2013, 04:52
Default Discretization Scheme
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I am using PISO scheme and Body Force weighted for Pressure correction. Also my analysis is transient. I need to run simulation to get result of 12hr duration. So i am using Adaptive time steping. But i could not understand two things
1. the iteration run for only one time. It does not show whether the solution is converged. By looking at the residuals i have to interpret the solution has converged or not. Is it normal with this scheme.
2. With adaptive time scheme i hope to get a time step of 10s so that my results come faster(as i require 12 hr of result) but when i am using the above scheme my time step goes to 1e-5 order. What should i do to improve this time step.
My domain is 1m long cylinder with another tube passing through it having dia 54mm. Outer dia of cyl is 0.6m, i have 8lac cells in the domain.(Phase change analysis)
my mesh file is in the link
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