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Old   June 9, 2020, 00:39
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luo dan
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hi,
I have a question whether NLH model can be used to simulate centrifugal compressor impeller (no static diffuser, i.e. no rotor stator interaction) and real gas (CO2)? The time-domain unsteady simulation can simulate centrifugal compressor impeller.
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Old   June 9, 2020, 08:28
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Hamid Zoka
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As long as unsteady flow features comes form the relative rotation of adjacent rows NLH can be used. Since it assumes that unsteadiness of flow variables has a zero-averaged value which means that an unsteady behavior is repeated over the time.
In case of a single row unsteadiness has not necessarily a zero-averaged behavior in macro scales. So I think it is not applicable to use NLH in this case.


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Old   June 10, 2020, 10:21
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luo dan
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thank you for your response,
I am also confused about whether the NLH method is suitable for co2 compressor in NUMECA(for condensable gas).
when i use NLH model to conduct unsteady calculation, the case always blew up due to 'thermodynamic tables directory:c:/users/dell\……‘not found.
however, the steady calculation is ok.
thank you!
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Old   June 11, 2020, 12:27
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Hamid Zoka
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Hi;
There may be some limitations in application of NLH method.
Have a look a Fine/Turbo users guide.

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