I have a model which is a quit complex building of pipes, which are in parallel and in serial and in additional with some flow resistance (ellbows and so on). At the end I have a outlet-lit, which represents a fan.
Now I like to get the pressure drop at this lit, so I can choose the proper fan in reality.
On the otherside of the model, I have some other lits (which represents several inlets to the parallel pipes, and opened to the ambient surrounding).
By now I tried to use following setup:
- internal analysis
- fluid: air; laminar and turbulent
- adiabatic wall; roughness 10 µm
- standard thermodynamic parameters; no velocity
this boundary condition:
- Inlet lit: ambient pressure
- outlet lit: constant flow rate
and this goals:
- total pressure at inlet and outlet
(here I am not sure, if I choosed the proper pressure (static?), and do I need to set a velocity goal as well, since this is a significant value for the pressure?)
in the next step, i vary the flowrate to create a pressure - flowrate - chart (the characteristic curve of that model).
I never expected to get a value which corresponds to 100 % to the real measurement.
But as I now measured, it doesn`t correspond at all.
So what kind of mistake did i make?
Where is my logical failure?
Thanks in advance.