problem withcontinuity residual
 

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.

Re: problem withcontinuity residual
 

Now I have another problem where the continuity,epsilon is flutuating periodically with no sign of convergence at all.

bob

Re: problem withcontinuity residual
 

Explain what you are trying to model. Are you modelling steady state?

Re: problem withcontinuity residual
 

Yes I am modelling steady State. Its about flow around abstacles. bob

Re: problem withcontinuity residual
 

Have you tried running this with the transient solver.

Re: problem withcontinuity residual
 

Hi

why should I run transients when the case is steadyState? Will it be helpful.

Pratap

Re: problem withcontinuity residual
 

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?

Re: problem withcontinuity residual
 

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