Learning Forum

[Luna Chen]

Hello everyone

I am simulating a compressor.These are my setting.

1.Steady

2.Reynolds stress model

3.MRF model

4.Mass flow inlet(0.01353kg/s)

5.pressure outlet(2824315pa)

6.Hybird initialization

My problem is the continuity residual not converging.

It seems like stuck in 0.1 forever.

Did my case converge? Does the continuity convergence effect my result? 

Thank you so much!

[Rob]

Monitor some contours, is the solution not converging because the flow field is poorly resolved in various regions or because there's a transient flow feature somewhere? 

[Luna Chen]

Hello Rob!

Does contours meaning the plane or streamline? Sorry I am not very sure what is contours.

The flow is all good.But I am researching the DPM result.

When I run different iterations,the DPM track of escaped parcels is totally different.

Like 100 track escaped in 400 iters and 300 track escaped in 450 iters.

I have ask the DPM problems in the other post,and I got an answer siad my simulation had not converged.

So I run 1000up iters to assure my DPM result.And its continuty always so high,so I am not sure is it normal or not.

And my proffesor also confused why my continuty is so high.

Thank you Rob!

[Rob]

Contours are the continuous surface plot, have a look in the Fluent tutorials (click on Help or look in Learning) as they're in all of the post processing exercises. 

You need to review the flow field carefully. You may find particles cluster and then blow clear, or that there's a transient feature in the flow. If the flow is complex then you may well need more than 1000 iterations.