[Guoxing Chen]

I am modelling tracer gas released from a hole, which is documented in the website (http://www.wind.arch.t-kougei.ac.jp/...rmal_Flow.html). Tracer gas (C2H4: 5% ethylene) was released at a flow rate of q=9.17x10^-6 m3/s. The flow rate was then normalized by reference velocity and reference height as C0. The measured gas concentration at measurement points were given as C/C0.

I still have the following questions:

1.What is the meaning of Passive Scalar in the Physics Values, shown in the attached picture.

2.How to set up the boundary condition: tracer gas (C2H4: 5% ethylene) was released at a flow rate of q=9.17x10^-6 m3/s?

3.How to calculate gas concentration (C/C0) at certain points.

Thanks very much for guiding me through the below questions.

Best regards,
Guoxing