Define Driving pressure
 

Technically I would like to define a driving pressure above a mass flow inlet.
I want to increase values of density and pressure in a certain domain, any advice?

Driving pressure above mass flow inlet? Can you clarify what you are asking, this isn't 100% clear.

Jet fluid is supposed to be pushed into a chamber with a certain driving pressure, which may partially dissipate by the end of the jet inlet duct. The density/pressure combination the model gibes me automatically for this domain is too low, I want both values higher. Any way to get there?

Thanks,
Bernie

Use a pressure condition and adjust the simulation backpressure to get the correct massflow.

The entire crossflow chamber is at constant pressure, just the jet domain should be at higher pressure to get more penetration. I think I can not use a pressure outlet, it is reacting flow and I do not want to specify outlet parameters. Am thus running an open outlet.

What is a pressure condition? The only pressure-related inlet BC star ccm+ has would be a stagnation inlet, which does not make sense as I would figure.

Use a stagnation inlet and specify the inlet stagnation pressure.


You can't have a static pressure inlet unless the flow is supersonic at the inlet.

Okay, sounds like a plan, thank you will try.


I got another idea in mind, can I superimpose two boundaries? For example by using a little extrusion domain and then using pressure and massflow separately.

So actually I found that at the outlet BC, you could specify a mass flow rather than a split ratio of 1. To my understanding, knowing two mass flows (main inlet and outlet) should set the third mass flow, unfortunately star has great trouble to get there, it would not converge well in the jet inlet domain. Any advice?