Learning Forum

[Adam Cwudziński]

Good mornig, I need a help with dpm model

[Kishan Konannavar]

Hello 

I request you please describe the issue you are facing and the specific aspect in which you need assistance. Accompanying your query with images would be very helpful.

Thank you

[Adam Cwudziński]

Welcom,

Thank You very much for your reply. I considered batch reactor with water mixing by top lance via nitrogen - simple system. I used DPM model and my question is about operating density. The system not include heat transfer, constant density of water and gas. I use only wall boundary condition, with at top of reactor witch escape boundary for nitrogen. I performed simulations for operating density equal density of nitrogen or water but for both the results are not valid with resulst obtained for physical experiments of water/air system in the lab.

Thank You for help.

Regards

[Rob]

Please can you post some results and what difference there is relative to the lab work? 

[Adam Cwudziński]

Welcome,

I obtained different values of time mixing. Too large difference, by numerically mixing is too slow. In the Fluent I used species model to tracer adding. Is it possible to use DPM model without operating density? I performed many simulations via Fluent over 20 past years, but this time I can not detect errors in my Fluent settings. Could You write me suggestions to the which density value should be used in my case. 

Regards

[Rob]

Operating density may effect how the flow field behaves, but shouldn't do anything to the DPM model. As I have no idea how the flow field is behaving I can't give any guidance on settings, so please post some results so I can see what's going on. 

[Adam Cwudziński]

Dear Rob,

Thank You very much, so now I know that potential problem is elsewhere.

Regards