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Naveen Kumar Gulla June 19, 2018 13:50
convergence problem
 
1 Attachment(s)
Hi,

Im trying to simulate the marine propeller using MRF approach. My solution is not getting converged and the values of epsilon is going like a waves as shown in the attachment. Can i treat it as a converged solution???

Thanks

amir.shahriari93 June 19, 2018 18:17
Firstly can you tell us what are you trying to simulate?

Naveen Kumar Gulla June 19, 2018 20:39
Quote:
Originally Posted by amir.shahriari93 (Post 696533)
Firstly can you tell us what are you trying to simulate?
Hi Amir,

I'm trying to simulate marine propeller using MRF approach.

Thanks

amir.shahriari93 June 20, 2018 02:18
1-Calculate your case with double precision.
2-Define monitors for quantities of interest of your simulation and plot them as the solution iterates.

If solution is not converging and monitors show periodic behavior, Probably your simulation has some unsteady features (e.g., Vortex-shedding) and you should solve it in a transient manner.

Naveen Kumar Gulla June 20, 2018 13:49
Quote:
Originally Posted by amir.shahriari93 (Post 696570)
1-Calculate your case with double precision.
2-Define monitors for quantities of interest of your simulation and plot them as the solution iterates.

If the solution is not converging and monitors show periodic behaviour, Probably your simulation has some unsteady features (e.g., Vortex-shedding) and you should solve it in a transient manner.
Hi Amir,

I have already used double precision option.

And regd monitors I have plotted lift and drag but they are also having periodic nature. I'm trying to validate the base paper and he used steady state analysis.

Thank You


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