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Forum: STAR-CCM+ March 20, 2015, 16:03
Replies: 16
Views: 9,484
Posted By fluid23
reference pressure is whatever you would subtract...

reference pressure is whatever you would subtract from absolute pressure to achieve your gauge pressures. (in most cases atmospheric pressure). definitely not 42bar.

I think you would be better...
Forum: STAR-CCM+ March 20, 2015, 08:14
Replies: 16
Views: 9,484
Posted By fluid23
Try using a velocity inlet. You can set pressure...

Try using a velocity inlet. You can set pressure and temperature there, it may not be 100% accurate on your mass flow rate but should get you pretty close.
Forum: STAR-CCM+ March 19, 2015, 17:51
Replies: 16
Views: 9,484
Posted By fluid23
You are pushing over 300 kg/s through a 5 cm...

You are pushing over 300 kg/s through a 5 cm pipe? Are you choking your flow? What fluid are you using? Molten lead? Can you do a hand calc and tell me what your average velocity would be? These...
Forum: STAR-CCM+ March 19, 2015, 17:47
Replies: 16
Views: 9,484
Posted By fluid23
In pipe flows your pressure and geometry...

In pipe flows your pressure and geometry determine your mass flow. That's basic fluid dynamics. If you set a mass flow in cfd the pressure at the boundary condition is going to have to float to...
Forum: STAR-CCM+ March 19, 2015, 15:09
Replies: 16
Views: 9,484
Posted By fluid23
that is a very large mass flow and pressure. are...

that is a very large mass flow and pressure. are you sure about those values? how big is your duct?
Forum: STAR-CCM+ March 4, 2015, 14:57
Replies: 16
Views: 9,484
Posted By fluid23
Correction, I mispoke about the nature of the...

Correction, I mispoke about the nature of the mass flow inlet. It sets velocity, not pressure. Not sure where I got that from. You might be able to specify both, if they are in reasonable agreement....
Forum: STAR-CCM+ March 3, 2015, 17:13
Replies: 16
Views: 9,484
Posted By fluid23
That seems reasonable. Ususally flow rate is a...

That seems reasonable. Ususally flow rate is a better parameter to set if it is known a priori, but life isn't always so easy. I typically use stagnation inlet for something like bleed air line...
Forum: STAR-CCM+ March 2, 2015, 12:54
Replies: 16
Views: 9,484
Posted By fluid23
I don't think you can specify both a pressure and...

I don't think you can specify both a pressure and mass flow rate. They would contradict eachother. The mass flow BC, as I understand it, adjusts the pressure to achieve the desired flow rate. ...
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