With the tracer study in Flow Simulation you can quickly simulate a concentration source,surface condensation or evaporation of admixture fluid (e.g. water vapor or toxic gas) in the carrier fluid (e.g air).The assumption being this admixture has little or no effect on the carrier fluid flow.
Examples of tracers in air being : water vapor, carbon dioxide,etc. Any admixture whose concentration is relatively low can be considered as a tracer. This feature is very useful for designing clean rooms.
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