Learning Forum

[jijojose2024]

Hii all,

I have been working on DPM for a while, initially when i used surface or single solid cone injectors the results ( temperature at the monitoring point was stable.... like converged to a nearly single value... but now i am using multiple solid cone injectors, and the temperature at the monitoring point is very unstable like varying about 30 deg. Can anyone say why is that?

Note: this is the cooling of a exhaust pipe using water injection inside the exhaust. Both continious phase and DPM is stable, and not transient.

[Rob]

If you plot temperature contours to see how the temperature variation is behaving how does it look? Just because the input flow is steady it doesn't always mean the output is! Also check DPM concentration (read the definition) to make sure you're not overloading a region (ie if the spray cones overlap/interact). 

[jijojose2024]

my outlet temperature is varying randomly ... not even in some regular intervals

 

[Rob]

What about velocity and planes along the flow path.