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[VidushiUCT]

Is operating pressure gauge pressure or an absolute pressure.

And does it set the pressure for all zones of the geometry or for any selected zone?

[Konstantin]

Fluent calculates gauge pressure, which is defined as p_gauge = p_abs - p_op. Thus, for a system without pressure variations,  p_gauge = 0 and p_op = p_abs. For more information, please refer to Sec. 8.14. Operating Pressure of Fluent User Guide.

The operating pressure is a global value used for all fluids zone. If you need to specify different pressures in different fluid zones, then this can be accomplished by prescribing different gauge pressures to those zones. 

[Keyur Kanade]

Please check following links. 

/forum/forums/topic/gauge-pressure-vs-operating-pressure/

/forum/forums/topic/operating-conditions/

Encourage to use search option on the forum. 

Regards,

Keyur

 

If this helps, please mark this post as 'Is Solution' to help others.

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[VidushiUCT]

Thank you for replying. I still have a query.

So if I have the pressure inside my reaction chamber as 14atm and do I input the operating pressure as 14atm or 13atm. I know there is a similar question on this platform, the link to which has been shared here, but the reply to that couldn't clear my doubt, that's why I'm posting again.

[Konstantin]

what is 14 atm, is it the absolute or gauge pressure? But let's assume it is the absolute pressure. To create this pressure inside your chamber you can:

1) set p_op = 14 atm and initialize the solution inside with p = 0

2) set p_op = 0 and initialize the solution inside with p = 14 atm

3) set p_op = 1 and initialize the solution inside with p = 13 atm

...

The combinations of the above don't matter at long as p + p_op = 14 atm. If you have inlets at outlets, then need to be adjusted accordingly

[VidushiUCT]

Thank you for your reply, Sir. It cleared my doubt. Although I didn't understand the last line. What does the phrase 'If you have inlets at outlets' mean, did you mean inlets and outlets?

 

[RK]

Yes, inlets and outlets. 

[Konstantin]

If you have inlets at outlets, then they need to be adjusted accordingly, i. e. pressure specification at inlets at outlets needs to be consistent with how you define the operating pressure

[Muskan Ayubi]

What if we set operating pressure is zero and there is error?