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Plotting total passive scalar flow

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Old   July 19, 2021, 03:40
Default Plotting total passive scalar flow
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Greetings,

I am currently doing a project on simulating mass transfer(diffusion) using passive scalar. In this project, i am using lagrangian particles as the source and i need a way to measure the total diffusion from the particles.

My current way of plotting the total value of passive scalar through a boundary(outlet) is to use a field sum monitor with a user field function that have the definition of "${Boundary Passive Scalar Flux}*${TimeStep}". However, the value I get is about 9 to 10 times bigger than the value I get from the sum report (passive scalar) in the prior region.

Am I missing something in my field function definition or another variable that i should take into consideration?

With thanks,
A CFD Beginner
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