Learning Forum

[luna6362]

Hi,everyone.

I am simulating a compressor.

It has been set in mass flow inlet and pressure outlet.

I heard that I can see the mass flow rate at inlet and outlet to determine its convergence or not.

But I am not sure what criterion of reaching convergence.

Thank you so much.

 

[SRP]

Hi,

You can observe that mass is conserved. The imbalance reported in Net Results is below 1% ,which is an acceptable result to check convergence.

[luna6362]

Hi SRP!Thanks for replying.

I have another question here.

As you say,the imbalance reported in Net Results is below 1%.

But when I let it continue to calculate, the results for mass flow never converged.

Is this a normal appearance? Thank you. 

[SRP]

Hi,

When the imbalance reported in Net Results is below 1%, it is consider to be converged. You will get error values less if you run simulation for more iterations.

 

[luna6362]

So your meaning is after getting the converged result.

It is okay that I simulate for more iterations even if the imbalance reported in Net Results is more than 1%?

When it not reach converged,how many iterations I should run more?

Thank you,SRP!

[SRP]

Hi,

As a best practise if net results is more than 1%, then better to run simulation for more iterations.

You need to check results for the convergence.

[luna6362]

Sorry that I didn't ask clearly.

My question is if it run 250 iterations and the net results is less than 1%,then I let it run 50 more iterations continue.

The net results become more than 1%.

Is it still acceptable convergence?

Thank you for your reply!

[SRP]

Hi,

If after additional iterations the results change significantly (more than 1%), it may indicate that the solution has not truly converged, and further investigation or continued iterations may be necessary to ensure the integrity of the converged results.

[luna6362]

I got it!

Thank you so much.