# problem withcontinuity residual

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 April 30, 2004, 05:11 problem withcontinuity residual #1 bob Guest   Posts: n/a I have a questions. First I did simulation and was monitoring the residuals. Contuinty equations reached 10^-5 and epsilon and k recahed 10^¯4 after say 2000 iterations then I did another 2000 iterations, what I found was the continuity residual suddenly becomes strted incresing 10^-4 and k,epsilon was 10^-6. The question is why does continuity residual increased.

 April 30, 2004, 05:36 Re: problem withcontinuity residual #2 bob Guest   Posts: n/a Now I have another problem where the continuity,epsilon is flutuating periodically with no sign of convergence at all. bob

 April 30, 2004, 05:50 Re: problem withcontinuity residual #3 Tom Guest   Posts: n/a Explain what you are trying to model. Are you modelling steady state?

 April 30, 2004, 07:10 Re: problem withcontinuity residual #4 bob Guest   Posts: n/a Yes I am modelling steady State. Its about flow around abstacles. bob

 April 30, 2004, 07:17 Re: problem withcontinuity residual #5 Tom Guest   Posts: n/a Have you tried running this with the transient solver.

 April 30, 2004, 07:40 Re: problem withcontinuity residual #6 bob Guest   Posts: n/a Hi why should I run transients when the case is steadyState? Will it be helpful. Pratap

 April 30, 2004, 15:06 Re: problem withcontinuity residual #7 CFD Rookie Guest   Posts: n/a Is there any seperation zone (or recirculation zone) after the abstacles? Did you get to check which node produces the highest residual? Is that node located inside the recirculation zone?

 May 10, 2004, 09:52 Re: problem withcontinuity residual #8 zachi Guest   Posts: n/a Is your case realy steady state or highly turbulent? At high rates of turbulence a unsteady scheme should be used, because of fluctuation velocities and possible swirls! regards zachi

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