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Defining a piecewise mass fraction in named expressions

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August 11, 2022, 23:53	Defining a piecewise mass fraction in named expressions	#1
askhur New Member Join Date: Aug 2022 Posts: 1 Rep Power: 0	Dear community members, I aim to define a piecewise constant mass fraction in a species transport simulation (ANSYS Fluent). I created a new "Named Expression" and in the definition field, I defined Code: IF(0[s] <= t <= 1[s], 0, IF(1.1[s] <= t <= 2[s], 1, 0) ) Now, instead of the final value 0, I want Fluent to use the mass fraction of oxygen at t = 1[s] (in oxygen + argon mixture). I have tried both "mf" and "MassFraction" in "Variables" section, but I have no clues how to proceed. Any help is appreciated. Thank you.

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mass fraction (y), species transport model

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