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Diffuser analysis - Compressible flow

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Old   October 6, 2017, 16:00
Post Diffuser analysis - Compressible flow
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Dameon Derk
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My diffuser is something like as shown in this image. http://turbomachinery.asmedigitalcol...11007_f002.png

I have the impeller exit velocity components and total temperature at diffuserr inlet , but I seer compressible flows, I cannot apply velocity inlet condition. How should I go about with the boundary conditions of this problem? I also don't have the diffuser exit conditions and I cannot apply outflow boundary as it is not compatible with compressible flows.
Any help will be appreciated.
Thankks a lot
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Old   October 10, 2017, 18:48
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I am still looking for solutions..
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Old   October 24, 2018, 10:08
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MWRS
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Me too. :/
Do you have total pressure and Mach at inlet?
If so, I think applying Pressure inlet and mass fow rate outlet is a good choice. It wont have any compatibility issues.
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Old   October 26, 2018, 10:34
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Lee Strobel
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Hi, I think you need to clarify more about what you are trying to do:


1) What are your inputs?
2) What are you trying to calculate?
3) What software are you using?
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Old   October 26, 2018, 11:14
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Hello Time4Tea. I am using Ansys Fluent 18. I'm provided for a duct the total pressure, static pressure, and inlet mach.

The Mach is subsonic and compressible, above 0.3 Mach hence density is set to ideal gas.

The domain is a diffuser with inlet, outlet and wall. I want to calculate outlet total pressure or pressure recovery. Please tell me what boundary conditions should I use for inlet and outlet? How do I specify the above mentioned known values in these boundaries?

Last edited by waseeqsiddiqui; November 21, 2018 at 03:13. Reason: adding software name too
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Old   January 9, 2019, 10:55
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pls help.....
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centrifugal compressor, compressible flows, diffuser, fluent

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