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Modelling water heating in a constant volume tank

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Old   June 1, 2014, 16:50
Default Modelling water heating in a constant volume tank
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Description:
-cylindrical water tank
-water heated by positive heat flux segments (each segment is defined by a time-dependent UDF)
-expect natural convection / buoyancy driven upward flow near walls
-2D axisymmetric

Geometry:
See Picture

Settings:
-Boussinesq approx for variable density
-transient (unsteady) simulation
-pressure-based solver
-laminar flow model

Problems:
-not getting good convergence (usually the continuity residual)
-velocities leaving the top and/or bottom boundaries:
See Picture

This seems like a simple case to simulate, but I've been struggling to get this to work for a while. I would appreciate any help with troubleshooting/debugging!

(Let me know for more information)

Last edited by amgsls; June 2, 2014 at 02:53.
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Tags
buoyancy flow, fluent, leaking boundary, natural convection, variable density

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