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fixed defs for adap time step namelist vars in README.namelist #2158

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Jan 23, 2025
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fixed defs for adap time step namelist vars in README.namelist #2158

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21 changes: 12 additions & 9 deletions run/README.namelist
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Original file line number Diff line number Diff line change
Expand Up @@ -405,20 +405,23 @@ Namelist variables for controlling the adaptive time step option:
use_adaptive_time_step = .false. ! T/F use adaptive time stepping.
step_to_output_time = .true. ! if adaptive time stepping, T/F modify the
time steps so that the exact history time is reached
target_cfl(max_dom) = 1.2,1.2 ! vertical and horizontal CFL <= to this value implies
no reason to reduce the time step, and to increase it
target_hcfl(max_dom) = .84,.84 ! horizontal CFL <= to this value implies
max_step_increase_pct(max_dom) = 5,51 ! percentage of previous time step to increase, if the
target_cfl(max_dom) = 1.2,1.2 ! if vertical CFL is <= to this value, it means there
is no reason to reduce the time step, and therefore
time step is increased
target_hcfl(max_dom) = .84,.84 ! if horizontal CFL <= to this value, it suggests no
need to reduce time step, and therefore time step
is increased
max_step_increase_pct(max_dom) = 5,51 ! increase percentage for the previous time step, if the
max(vert cfl, horiz cfl) <= target_cfl, then the time
will increase by max_step_increase_pct. Use something
large for nests (51% suggested)
starting_time_step(max_dom) = -1,-1 ! flag = -1 implies use 4*dx (defined in start_em),
will increase by this percentage; use something
much larger for nests (51% suggested, i.e., = 5, 51, 51)
starting_time_step(max_dom) = -1,-1 ! flag = -1 sets time step to 4*dx (defined in start_em),
starting_time_step = 100 means the starting time step
for the coarse grid is 100 s
max_time_step(max_dom) = -1,-1 ! flag = -1 implies max time step is 8*dx,
max_time_step(max_dom) = -1,-1 ! flag = -1 sets the max time step to 8*dx,
max_time_step = 100 means that the time step will not
exceed 100 s
min_time_step(max_dom) = -1,-1 ! flag = -1 implies max time step is 3*dx,
min_time_step(max_dom) = -1,-1 ! flag = -1 sets max time step to 3*dx,
min_time_step = 100 means that the time step will not
be less than 100 s
adaptation_domain = 1 ! default, all fine grid domains adaptive dt driven by coarse-grid
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