Interface Mixing-Plane

Techies · May 3, 2022, 06:10

Hi guys, I'm working with 1.5-stage turbine. I'm using stage mixing plane between rotor and stator, options constant total pressure and specified pitch angles. Why the value of massFlowAve(Total Pressure) in the interface of rotating domain is different from that of stationary domain ?

Opaque · May 3, 2022, 07:58

Have you already accounted for the pitch change between the rotor and stator?

Which total pressure are you expecting to conserve across the mixing plane? A good read of the documentation seems the right thing to do.

Techies · May 3, 2022, 13:49

So it's because the pitch angle ? All value is always different between 2 interfaces, right ?

Opaque · May 3, 2022, 15:43

Not only pitch angle, but that is a start.

Advice is to start simple and learn what the mixing plane is doing as you increase the LoD (level of difficulty)
1 - Can you match the mass flows across the interface? LoD = Trivial
2 - Can you match the "energy flow" across the interface? LoD = Medium
3 - Can you match the "total pressure XX" across the interface? LoD = Advanced

May 3, 2022, 06:10	Interface Mixing-Plane	#1
Techies Member Mercurial Join Date: Mar 2021 Posts: 72 Rep Power: 6	Hi guys, I'm working with 1.5-stage turbine. I'm using stage mixing plane between rotor and stator, options constant total pressure and specified pitch angles. Why the value of massFlowAve(Total Pressure) in the interface of rotating domain is different from that of stationary domain ?

May 3, 2022, 07:58		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,898 Rep Power: 33	Have you already accounted for the pitch change between the rotor and stator? Which total pressure are you expecting to conserve across the mixing plane? A good read of the documentation seems the right thing to do. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

May 3, 2022, 15:43		#4
Opaque Senior Member Join Date: Jun 2009 Posts: 1,898 Rep Power: 33	Not only pitch angle, but that is a start. Advice is to start simple and learn what the mixing plane is doing as you increase the LoD (level of difficulty) 1 - Can you match the mass flows across the interface? LoD = Trivial 2 - Can you match the "energy flow" across the interface? LoD = Medium 3 - Can you match the "total pressure XX" across the interface? LoD = Advanced __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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May 3, 2022, 13:49		#3
Techies Member Mercurial Join Date: Mar 2021 Posts: 72 Rep Power: 6	So it's because the pitch angle ? All value is always different between 2 interfaces, right ?