Required field
Required field
Required field

# What Does (φ) Flux and T1 stand for?

### What Is (φ) Flux Term?

Flux is a non-dimensional parameter, which represents the concentration. Because this parameter has no influence on fluid properties, the user can define it as a percentage (%), ppm (parts per million), ppb (parts per billion), Watts, or any other concentration unit.

Flux can be defined in two ways:

• (φ) Flux: Concentration per unit time $$[1/s]$$
• (φ) Flux: Concentration per unit volume $$[1/m^3s]$$

### What Is T1 Term?

If you are using SimScale’s old post-processor then T1 is a parameter in solution fields, representing the passive scalar concentration inside the domain. The unit of T1 is the same as flux defined in passive scalar sources in Advanced concepts or the passive scalar value defined in Boundary conditions (shown below).

The above examples are from SimScale’s tutorial Contamination of Power Plant. Make sure to go through it.