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Flag to stop using UDF in a defined zone

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Old   May 18, 2021, 05:00
Default Flag to stop using UDF in a defined zone
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Dear all,

Is It possible in Fluent to include a flag/domain check to apply the UDF only if a condition is fulfilled and then make the change more specific ?

For instance, if I use a DEFINE_TURBULENT_VISCOSITY in a Stress-Blended Eddy Simulation, can I only use this UDF to modify the turbulent viscosity for the RANS part and not the LES one (without hardcoding a subgrid scale viscosity model with a if{..}else{...} statement) ?

Thanks !
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Old   May 19, 2021, 20:40
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how are you going to use condition statement without if{..}else{...} ?

using journal file (or scheme) you may turn on/off sources (as as you would do it manually in GUI) may be this is a way out for you
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Old   May 20, 2021, 10:35
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What I meant by no if{...}else{...} was to not hardcoding the turbulent viscosity (sub grid scale) model for the LES but rather something like :

IF(condition fulfilled){use DEFINE_TURBULENT_VISCOSITY}
ELSE{do not use DEFINE_TURBULENT_VISCOSITY}

I'll have a look to scheme

Thanks
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