|
[Sponsors] |
Does the study of vane-recessed casing treatment truly need transient simulations? |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
July 14, 2018, 13:47 |
Does the study of vane-recessed casing treatment truly need transient simulations?
|
#1 |
Senior Member
Join Date: Aug 2012
Posts: 268
Rep Power: 14 |
I am reading a paper on the necessity of doing transient simulation to study the effect of axial and vaned-recess casing treatments on a compressor.
The paper emphasizes that steady state simulations does simplify the problem. "While some CTs, such as circumferential grooves, can be described by a rotation surface and can thus easily be included in conventional steady simulations, the CFD analysis of other casing treatments like axial slot or recessed vanes, currently requires a time-resolving analysis of the interaction between such structures and rotating parts." The reason is not clear for me although I have seen this in a few papers. I have been doing steady state simulations to understand the physics of vane-recessed casing treatment. The paper mentions that a mixing plane interface makes too large simplification and then concludes that a transient simulation is necessary. I have used a frozen rotor interface in ANSYS CFX and not a mixing plane. Does this apply to vane-recessed casing treatment in general? |
|
July 15, 2018, 19:18 |
|
#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,741
Rep Power: 143 |
I have no idea what a vane recessed casing treatment is.
__________________
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
|
July 16, 2018, 07:55 |
|
#3 |
Senior Member
Join Date: Aug 2012
Posts: 268
Rep Power: 14 |
Please see the attachment.
|
|
July 16, 2018, 08:20 |
|
#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,741
Rep Power: 143 |
There certainly is going to be an interaction between the blade and the cavity. This means mixing plane approaches do not sound appropriate, but frozen rotor should be OK.
Also with all those sharp edged cavities in there I would expect to see large separations, and that can be problematic for RANS approaches. I suspect accurate results will require a SAS or DES approach. But a RANS model should give you the general idea (as long as you don't mind a reasonable margin for error).
__________________
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
The simulation of a centrifugal compressor with holed casing treatment | gongmq | CFX | 4 | July 16, 2018 05:15 |
Fitting casing treatment on rotor | Julian121 | CFX | 1 | May 11, 2018 07:21 |
Interfaces between blade channel and casing treatment | SNeCu | CFX | 3 | September 20, 2017 22:36 |
Add casing treatment in NUMECA | SNeCu | Fidelity CFD | 9 | July 24, 2017 23:15 |
transient term treatment | Mike | Main CFD Forum | 9 | February 18, 2003 13:26 |