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-   -   the "continuity" Residual (https://www.cfd-online.com/Forums/fluent/97197-continuity-residual.html)

ay.harr February 11, 2012 05:09
the "continuity" Residual
 
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

DungPham February 13, 2012 12:00
Quote:
Originally Posted by ay.harr (Post 343902)
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" ?

cfdnewbie February 13, 2012 17:58
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!

emreg February 14, 2012 02:29
you can try it with first order discretization settings.


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