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centrifugal compressor - simulation - no compression |
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November 29, 2015, 08:48 |
centrifugal compressor - simulation - no compression
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#1 |
New Member
Bartek
Join Date: Nov 2015
Location: Szczecin, Poland
Posts: 8
Rep Power: 10 |
Hello all,
this is my first post so I apologize in advance for any errors and my English. For several months, I try to simulate the real engine compressor. The compressor has been scanned 3D, then in SE machined surface, created inlet and an outlet, all as a solid model scan.jpg se model.jpg Then, in ANSYS design modeler, I called all the walls, freeze, and I set the in Details Viev as fluid 1.jpg I made mesh Attachment 43824 In the CFX settings, intake as stationary, rotor as rotary and outake as stationary. analysis type -transient or staty state- result is the same. in the details of fan : domain type-fluid domain, air at 25C, reference pressure 1 atm. In the inlet m I set up, the static pressure of 1 atm, the total pressure of 1 atm, the mass flow rate of 2.03 kg / s. In the outlet, also I tried to set static pressure/total pressure 8 atm, pr mas flow rate 2.03 kg/s. 3.jpg After several attempts, the results are always the same, does not get compress. Pressure in all compressor is constantly. 4.jpg Please help me, Bartek |
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November 29, 2015, 17:11 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
I can see your mesh is WAY too coarse. You will need a much finer mesh.
Try that and see what happens - there are probably other problems to fix as well. |
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November 30, 2015, 15:29 |
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#3 |
New Member
Bartek
Join Date: Nov 2015
Location: Szczecin, Poland
Posts: 8
Rep Power: 10 |
I tried many times to create a mesh and These mesh, was the only one who correctly has formed and has allowed for further analysis. In my opinion, the problem is somewhere in the settings in the pre-CFX : inlet/outlet or interfaces.
PS. on the the first picture, this isn't mesch. This is result of 3d scanning. The compressor model consists of a many surfaces being the whole model |
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November 30, 2015, 15:59 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
Can you show an image of your mesh?
Also please post your CCL and/or your output file. |
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November 30, 2015, 16:56 |
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#5 |
New Member
Bartek
Join Date: Nov 2015
Location: Szczecin, Poland
Posts: 8
Rep Power: 10 |
Ofcourse, but tomorrow. At this moment, CFX-solver is running.
CCL what do You mean? |
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November 30, 2015, 18:31 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
In CFX-Pre, go File/Export/CCL. It is the command file which describes the simulation setup and physics. It is a small text file.
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December 1, 2015, 13:56 |
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#7 |
New Member
Bartek
Join Date: Nov 2015
Location: Szczecin, Poland
Posts: 8
Rep Power: 10 |
The result of the last calculations
result.jpg Now there is some compression but totally strange Types And the mesch mesch.jpg |
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December 1, 2015, 18:34 |
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#8 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
That mesh is way too coarse. You will need to refine it.
Also I can see recirculations and other weird stuff in your streamlines. This means: * Your device is operating way off its operating point and therefore the streamlines are recirculations. Then it is correct in saying it produces no compression. AND/OR * Your simulation is not converged yet, you need to converge it more to pull those recirculations through the simulation. |
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December 2, 2015, 13:12 |
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#9 |
New Member
Bartek
Join Date: Nov 2015
Location: Szczecin, Poland
Posts: 8
Rep Power: 10 |
And CCL file
compressor.zip |
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December 2, 2015, 18:00 |
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#10 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
You appear to be trying to do a compressible gas simulation, but you have not chosen a fluid model which has variable density. You should choose a fluid model which has variable density, such as Air (Ideal Gas).
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