|
[Sponsors] |
June 15, 2016, 00:57 |
Impeller is not rotating
|
#1 |
New Member
junwee
Join Date: May 2016
Posts: 4
Rep Power: 9 |
Reference pressure: 1 atm
Inlet pressure: 4360 Pa (Hydrostatic pressure) Outlet pressure: 2657 Pa Interface: Frozen Rotor Impeller: 2656rpm Hi guys,I am fresh to CFX but I have went through tutorials before carry out my project. The flow pattern is incorrect(should be looks like vortex) and I've found out the impeller is not rotating when i set it to stationary (0 rpm) and i get same result. May I know which part I did wrongly? In fact, the outlet pressure should be higher than inlet. |
|
June 15, 2016, 02:07 |
|
#2 |
Senior Member
Maxim
Join Date: Aug 2015
Location: Germany
Posts: 415
Rep Power: 12 |
||
June 15, 2016, 03:07 |
|
#3 |
New Member
junwee
Join Date: May 2016
Posts: 4
Rep Power: 9 |
Hi Maxim,I am sorry if my statement is not clear enough. What I mean is although I defined impeller as solid domain and 2656 rpm, it didn't shows the correct streamline and result. Regardless of what RPM i defined, the result is still the same. In other word, the impeller is not 'rotating' to generate higher pressure and velocity.
I don't really need the impeller to rotate in animation. |
|
June 15, 2016, 03:22 |
|
#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
Are you drawing streamlines on Velocity? That may well show no twist. If you draw them on "Velocity in stationary frame" that might show what you are thinking of.
And: why have you defined the rotor as a solid domain? It should be a region cut out of the fluid domain as there is no need to model the rotor as a solid for most cases. Have a look at the CFX tutorial examples on rotating machinery. Finally: As your volute design appears to be poor (there is a large gap between the impeller and volute casing) I would not expect much pressure rise in this design. |
|
June 15, 2016, 03:37 |
|
#5 |
New Member
junwee
Join Date: May 2016
Posts: 4
Rep Power: 9 |
Hi ghorrocks. Thanks for your reply.
what do you mean by drawing streamlines on velocity? the inlet piping is close to the eye of impeller in order to ensure the water is fully absorbed by the eye. Do you mind sharing the tutorial examples you mentioned above? Because tutorials i went through, impeller are usually defined as a solid domain. I am sorry to have a such poor design as this is the only educational pump that I have. |
|
June 15, 2016, 05:07 |
|
#6 |
Senior Member
Join Date: Jul 2011
Location: Berlin, Germany
Posts: 173
Rep Power: 14 |
Maybe these two threads could help you.
They deal with similar problems: http://www.cfd-online.com/Forums/cfx...fan-balde.html http://www.cfd-online.com/Forums/cfx...estepsize.html |
|
June 15, 2016, 07:41 |
|
#7 | ||
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
Quote:
Quote:
|
|||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Having a few problems in simulating a rotating impeller | ajinsan | CFX | 12 | February 4, 2016 16:10 |
Autoclave with two sets of impeller blades to hollow rotating shaft - Error in Comput | bharadwaj813 | Main CFD Forum | 0 | March 31, 2015 06:45 |
Rotating Impeller | Naith | FloEFD, FloWorks & FloTHERM | 22 | November 5, 2012 08:53 |
Mixing model with rotating impeller problem | 201 | CFX | 10 | May 14, 2010 11:59 |
Boundries of rotating impeller created in Gambit ? | Mounir | FLUENT | 2 | October 23, 2000 06:56 |