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the "continuity" Residual

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Old   February 11, 2012, 06:09
Default the "continuity" Residual
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aymen harrabi
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Hallo every body,

I am running a laminar simulation with Fluent. the residuals window shows that all my parameters are fluctuating around a value which is smaller 10-3 only the continuity residual which is fluctuating around value smaller than 10-01. can I say that my Simulation has been converged? and what is this continuity residual?

thanks for help

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Old   February 13, 2012, 13:00
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Dung A.Pham
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Quote:
Originally Posted by ay.harr View Post
Hallo every body,

I am running a laminar simulation with Fluent. the residuals window shows that all my parameters are fluctuating around a value which is smaller 10-3 only the continuity residual which is fluctuating around value smaller than 10-01. can I say that my Simulation has been converged? and what is this continuity residual?

thanks for help

Regards
10^-3 ( default in Fluent and it can be change ) value is convergence criterion ( that we desire ) and i think that 10^-1 is so high ! .
Did you run " First Order Implicit" in the " Transient Formulation" ?

Last edited by DungPham; February 13, 2012 at 20:27. Reason: i mis-write !
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Old   February 13, 2012, 18:58
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The density residual gives you the error in your RHS of the continuity equation. 10 to the minus 1 seems to be pretty high, check your boundary conditions, often they prevent further convergence in density!
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Old   February 14, 2012, 03:29
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Emre G
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you can try it with first order discretization settings.
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