Initial Values
The Initial Values node adds initial values for the incident molecular flux, number density, and pressure. For the transient solver, these values define the state of the problem at the initial time step; for the stationary solver, they serve as a starting point for the nonlinear solver.
For transient problems it is often difficult to specify consistent initial conditions. It is possible to add a stationary step in the study to serve as the initial condition for the transient problem, or to start the system at total vacuum (all values equal to zero) and to ramp up the pressure or flux at inlets or reservoirs prior to adding time-dependent effects.
Incident Molecular Flux
For each species, enter the Incident molecular flux, GG (SI unit: 1/(m2⋅s)).
Pressure
For each species, enter the Pressure, pG (SI unit: Pa).
Number Density
For each species, enter the Number density, nG (SI unit: 1/m3).