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howto model species transport with additional variable?

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Old   December 25, 2017, 00:19
Default howto model species transport with additional variable?
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zmliu
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i need to model species transport with additional varialble.Then the density of working fluid must be defines as a funtion of addition variable,such as:Av1*5 [ ] *1[ kg m^-3] +1.225[kg m^-3].(Av1 is the name of additional variable)
when i begin the solutin ,show the error:
Error processing expression 'Density'.
The expression is invalid because:
Av1 is not available for use in this term

Error processing expression: Density = Expression 1

the question is that how to define the density of the fuid as a function of additional variable when i model species transport with additional variable?
thank you very much!
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Old   December 25, 2017, 03:11
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Glenn Horrocks
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Why do this using an additional variable? Why not use a multicomponent mixture and all this functionality is built-in, including the numerics required to stabilise it.
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Old   December 25, 2017, 04:55
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First of all, units of the expression should be stable.
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