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April 19, 2018, 13:56 |
Convergence
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#1 |
Senior Member
Join Date: Aug 2012
Posts: 269
Rep Power: 15 |
I am simulating flow in an axial flow compressor near choking point.
There is a bellmouth at the inlet of compressor as shown. I have two questions: 1. Can the bellmouth be added to the rotor domain in the bladegen? I saw it in a tutorial (axial fan) that the intake was included in the domain of rotor. I am using solidwork to draw a section of intake and then use a general interface to connect the bellmouth and the rotor. 2. When I simulate near the choking point, the residual history shows that the momentum components go up and down and the solution never converges. Does this occur because of wrong BC? I am using static pressure bc at the outlet. |
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April 19, 2018, 19:03 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
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1. Yes, it can rotate. Make the walls counter rotating if they are stationary.
2. FAQ: https://www.cfd-online.com/Wiki/Ansy...gence_criteria
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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April 20, 2018, 16:04 |
Intake effects
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#3 |
Senior Member
Join Date: Aug 2012
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Does a big axial gap between the bellmouth and the first blade row which might happen in a static test rig justify ignoring its influence on downstream components? Besides performance map, what can be used to measure its influence and justify ignoring its effects?
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April 22, 2018, 08:32 |
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#4 | ||
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
Rep Power: 144 |
Quote:
Quote:
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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