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-   -   MIXASI (http://www.cfd-online.com/Forums/cd-adapco/52883-mixasi.html)

Lorenzo April 17, 2002 08:34

MIXASI
 
Someone can help me in setting MIXASI feature? I have those errors...

**ERROR - THE CURRENT EVENT DOES NOT HAVE ANY

DESCRIPTIONS TO BE SAVED. TIME OF OCCURRENCE = 0.00000000 ACTUAL EVENT NUMBER 2 DEFINED AT TIME 0.00000000 PROCEED TO DEFINE OCCURRENCES **WARNING - SLIDING EVENT 1 NOT SAVED IN EVENTS DATA FILE 8 **WARNING - SLIDING EVENT 1 NOT SAVED IN EVENTS DATA FILE 8 SLIDING EVENT 1 ENABLED IN CURRENT EVENT NUMBER 2

Thank you

Achim April 17, 2002 14:37

Re: MIXASI
 
is it still your radial fan ? tutorial 7.3 might help. but is MIXASI really useful in your case ? i posted some hints to your previous question.

regards

LORENZO April 17, 2002 15:55

Re: MIXASI
 
It's ALWAYS my radial fan, because I tried with lower values of rpm, but the convergence (expecially for mass) is poor...I must wait convergence for all runs? You don't think transient approach will give better results? Thank you,Lorenzo

Achim April 18, 2002 14:35

Re: MIXASI
 
No as I said you don't need a converged solution for all rpms, but a stable one. when using standard relaxations about 20-50 iterations per rpm should do.

I use transient runs only if i am looking for transient effects. when investigating the blade design it seems to be more useful model the blade with cyclic boundaries and a dense mesh. when looking at the whole impeller you will have to use coarser grids.

For transient runs i don't use MIXASI because of the restrictions to the mesh at the interface. instead I use arbitrary sliding interfaces with an initial solution from steady explicit mrf (don't use this for steady-only runs).

so I always start with steady runs.


bosko April 19, 2002 03:48

Re: MIXASI
 
What restrictions on the mesh at the interface?

B.

Lorenzo April 19, 2002 07:29

Re: MIXASI
 
I think 1:1 correspondance....


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