simulation load loss tube

[netstrike]

hello to all, I am having problems with a simple simulation (solidworks flow) ...

simple tube of 100m from 1''' and 1/2; gas: air; I set 7 [bar] static pressure input and 0.133 [m^3/s] of output flow (to find the pressure drop).
by calculations I should get about 0,45 [bar] of fall, instead from the simulation comes out 3,6 [bar] ... and the scope cre calculates me in the input is about half the output....

I just can't figure out where I made the mistake of setting the data...
Thank you very much.

 

[meccanicamg]

Didn't you miss the units? Are you sure atmospheric pressure doesn't work?
Usually the standard simulation is known input flow and atmospheric pressure output. Try to look at the tutorials because something doesn't go on the settings or constraints you gave... that maybe you believe one thing and it's another....

 

[Vmax]

first consideration: the flow is compressible, so you have to set the calculation in accordance.
second consideration: being the compressible flow volumetric flow unless normalization is preserved.
third consideration: As mechanicalmg suggests, the most robust setup for this problem is inlet flow, output pressure. you can use a pressure 0 if appropriate the reference pressure and gas properties.
try with a setup of this type and see how it goes.

 

[Lucaallegrini]

Good evening, excuse the intrusion, I would like to ask vmax what it means in the last message when it says "if appropriate correspondingly the reference pressure and the properties of the gas".
Thank you.