SUBROUTINE b4step(NodeInfo Info)

Defined In:

contrib/astro/problem.f90

Inputs:

NodeInfo Info. The grid to be prepped for advancement.

Description:

Implements any problem conditions that need to be initialized before each timestep. A common example is the inflow of material into the problem domain, such as you might get from a wind or a jet.

This function has five main tasks:

1. If MHD is turned on, then the b4stepMHD() subroutine is called.

2. If source term protection is turned on (iProtect > 0), then the Protect() subroutine is called.

3. If the module flag lmodule is set, then b4step() triggers the b4step_module() subroutine.

4. If the FloorTemp variable is greater than 0, then the subroutine ensures that each cell's energy density value does not drop below FloorTemp * rho + 1/2 (rho * |v|^2 + |B|^2).

5. If MaintainAuxArrays is set, then the aux array masks are set to -INFINITY.

Called In:

WaveBear :: advance()

MultiGrid :: advance()

MusclBear :: advance()

ClassicBear :: advance()

CompactBear :: advance()

Modules Used:

None.

Files Included:

None.