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continuity convergence in buoyancy driven flows

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Old   March 29, 2011, 04:31
Question continuity convergence in buoyancy driven flows
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Alain
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Hi,

I'm trying to solve a mixed convection flow. All the residuals are dropping except the continuity which is oscillating and decreasing very very slowly. I'm using an incompressible ideal gas for the density with a RNG k-epsilon model. I increased the density of the mesh around the cylinder (representing the human body) and the total number of elements is around 1,700,000. I am monitoring the velocity variations near the human body and it seems they stabilized and the variations are of the order of 10e-5. The number of iterations reached so far is 2700. Should I consider the solution as converged? Why are the continuity residuals oscillating around 1e-3?

Thank you
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buoyancy flow, continuity error, mixed convection

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