find the cell(s) related to maximum continuity residual
 

Hello,

I am wondering if there is a way to find out the position of the cell(s) that has high continuity residual. In my calculation I got the order of 10e5 for the continuity residual. As far I know, the number we see in the continuity residual is the maximum value in all domain. So in my calculation maybe there are a few number of elements that cause such a high value for continuity. In this case I can refine my mesh in that particular area and got correct answer.

Any idea ?

Thank you in advance!
Hooman

Hi Enayath,

I have a similar problem.
Did you find a way to find out the cells that cause bad residuals?

I would really appreciate if you can help me.

Fabio

Hello Fabio,

I really do not remember how I could fix it. However, I can say you need to refine the mesh close to the boundary layers or change the settings...like time step or use Simple or Piso...If you use Design modeler and Meshing, you can find the quality or skewness or the relevant information after making the mesh in Meshing. You can check the number and the position of the bad elements in Meshing...go to statics and choose element quality or skewness or orthogonality to find the bad elements...You can also send me your case if you would like...I can take a look.

Good Luck,
Hooman

Hi Enayath,

thanks a lot for the help.

I found a way to visualize which cells have bad residuals:

If you type: solve/set/expert you get the following questions:
Save cell residuals for post-processing? [no]
Keep temporary solver memory from being freed? [no]
Allow selection of all applicable discretization schemes? [no]

For the first write YES for the others keep no.
Run one iteration.
now you can visualize the contours of the residuals. I just made some isoclips of the higher residuals.

I think these are real residuals and not scaled ones, since I get also some negative one.

Do you think is a correct method?

Fabio

Fabio,

Unluckily, I have no idea how does it work!

Hooman