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Mean Age of Air Convergence

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Old   December 12, 2013, 19:09
Default Mean Age of Air Convergence
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Michael Smith
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Hi all,

I've searched the forum and it seems this is a stupid problem to have, since no one else has it....

I've set up mean age of air in CFX using an additional variable and subdomain etc, however it isn't converging. The age essentially just increases as the iterations increase, even if the momentum residuals have converged...

Ideas?
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Old   December 16, 2013, 22:59
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Michael Smith
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Ok so advice from support was that MAA equation needs quite a long time to converge because it relies on convecting all the flow from teh inlet through to the outlet. For flows with dead spots, this will take a long time to track the entire fluid path. This can be sped up by using a larger timestep or timescale factor (eg factor of 10).
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