[Onurozcan]

Hi,

Iterations I have specified have been still continued( totally 500) but is still converged in 3d flow

All equations are like linear.

Is it absolutely necessary to see converged? or is it enough as all equations are linear?

https://imageshack.com/i/pbeqGtmtp

Can anyone help me out with this information ?

[shereez234]

Originally Posted by Onurozcan

Hi,

Iterations I have specified have been still continued( totally 500) but is still converged in 3d flow

All equations are like linear.

Is it absolutely necessary to see converged? or is it enough as all equations are linear?

https://imageshack.com/i/pbeqGtmtp

Can anyone help me out with this information ?

Continuity equation has not crossed below 1e-02; But you are saying this sic converged. I still think 500 iterations is too less; atleast try to have 2000 roughly?

Well on the other hand, one can say that the solution is converged even if the residuals are high if you are observing a paraemeter such as CL, CD, or pressure at a point and it's not changing with flow time or iterations or changing with a periodic pattern.

So perhaps you should observe a quantity of interest at a surface, line or a point you are interested in and see if that quantity of interest.

[Onurozcan]

Originally Posted by shereez234

Continuity equation has not crossed below 1e-02; But you are saying this sic converged. I still think 500 iterations is too less; atleast try to have 2000 roughly?

Well on the other hand, one can say that the solution is converged even if the residuals are high if you are observing a paraemeter such as CL, CD, or pressure at a point and it's not changing with flow time or iterations or changing with a periodic pattern.

So perhaps you should observe a quantity of interest at a surface, line or a point you are interested in and see if that quantity of interest.

Hi,

Thanks for replying.

What does CL and CD stand for?

After I wrote down this post yesterday, analysis have been converged in 357 iteration.

But some results are unrealistic like total heat transfer rate, ( shown as 270w but I have calculated 770kw by hand.) mass flow rate etc. Results>Reports>Fluxes>Total heat transfer rate

as a post processing,CFD-Post is better than field ''results'' of Fluent.?

[shereez234]

I am sorry I wrote CL and CD by mistake. You can just observe any quantity of your interest

[shereez234]

Regarding your last question; CFD post is the official post processor for ANSYS so it should be much better. I don't find fluent bad as well.

and It is common to diverge away from thoery. There are so many things you need to keep track of and be cautious to come closer to experimental/hand calculated data. I am not an expert in thermodynamics or anything that involves heat transfer. I hope some one else pops in to clarify your issure

[Onurozcan]

Originally Posted by shereez234

Regarding your last question; CFD post is the official post processor for ANSYS so it should be much better. I don't find fluent bad as well.

and It is common to diverge away from thoery. There are so many things you need to keep track of and be cautious to come closer to experimental/hand calculated data. I am not an expert in thermodynamics or anything that involves heat transfer. I hope some one else pops in to clarify your issure

Sheereez,

Thanks in advance for valuable informations.