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UDF to check the volume fraction of secondary phase

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Old   May 5, 2020, 16:45
Default UDF to check the volume fraction of secondary phase
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shivam salokhe
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Hello Everyone,

I am trying to write a UDF code that enables us to check the volume fraction of the secondary phase in a given cell zone while using the volume of fluid method. Also, I need to store the related time value when the volume fraction of the secondary phase in a cell zone becomes 1. Total I have 4 different cell zones.

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Old   May 6, 2020, 00:34
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read Ansys FLuent Customization manual,
look for VOF Multiphase Model Macro

you may store the time moment when C_VOF == 1 into user-defined memory (however, it depends on why do you need it and how are you going to use these data)
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Old   May 6, 2020, 04:25
Default Checking volume fraction
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As Alexander suggested, you can use C_VOF macro to fetch value of volume fraction for any of the phase. However, you need to decide about when do you want to run such a function. If you run it, say, every time-step, then it is possible that a cell is full of secondary phase at one time but only partially filled with secondary phase at next instant. So, you have to have a logic that you wish to use to assign a marker of 1 or 0. You will have to use User-Defined Memory to save this marker. One you are clear about this logic, code is fairly simple.

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fluent - udf - parallel, vof multiphase

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