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Jet Launch Module

The Jet Launch Module contains routines for initializing launch regions around particles.

Inflow

Updates values in cells around a sink particle and transfers the change in mass and momentum to the sink particle.

  SUBROUTINE Inflow(iSink, dt, rho, v_r, temperature, half_angle,r_inner,r_outer,merge_factor)
    Subroutine to create an inflow/outflow region around a sink particle with a given velocity ramp up, density, and pressure
    iSink = Sink_Particle index
    dt = time step
    dM = change in sink particle mass
    dP = change in sink particle momentum
    rho = density of launch region
    v_r = velocity at outer edge of launch region
    temperature = temperature at outer edge of launch region
    half_angle = half opening angle of outflow (Pi/2 = spherical)
    r_inner = inner radius (everything inside is stationary with respect to sink particle
    r_outer = outer edge of launch region
    merge_factor = ranges from 0 to 1 with 0 corresponding to replacing values with exact solution, and 1 corresponds to using only the analytic source terms.

Outflow_init

Outflow_init returns the analytic values for the conservative values for a linear ramp-up profile from r_inner to r_outer

v(r) = v_r*(r-r_inner)/(r_outer-r_inner)
where v(r) is the velocity in the radial direction

Outflow_source

Outflow_source returns the source terms needed for maintaining the same linear ramp-up profile from r_inner to r_outer