**Syntax**

` >>> CONSECUTIVE: max_iter1`

**Parent Command**

` >> CONVERGE`

**Subcommand**

` -`

**Description**

By default, TOUGH2 simulations are stopped if 10 consecutive time steps converge with a single Newton-Raphson iteration because no update of primary variables occurs. This command allows changing the maximum number of allowable time steps with ITER=1 to *max_iter1*. Consecutive time steps with no update of primary variable occur if:

(1) steady-state is reached;

(2) calibration or printout times are too narrowly spaced;

(3) the maximum time step size (TOUGH2 variable DELTMX) is too small;

(4) the initial time step (TOUGH2 variable DELTEN or DLT(1)) is too small;

(5) a small time step is taken to land on a calibration or printout time.

Only (1) is an acceptable TOUGH2 convergence (see command `>>> STEADY-STATE).` All the other reasons may lead to premature termination of a TOUGH2 simulation. Convergence problems are more often encountered in iTOUGH2 than in a standard TOUGH2 simulation because many parameter combinations are submitted. This command makes TOUGH2 more tolerant of this kind of convergence failure. It is important, however, that *max_iter1* is only increased to overcome temporary convergence problems during the optimization, i.e., the final parameter set should yield a TOUGH2 simulation without convergence problems. Calibration points should not be spaced too narrowly in time (see command `>> TIME).` Command `>>> ADJUST` can be used to overcome problem (4). Note that a special time stepping procedure is incorporated in iTOUGH2 to avoid problem (5).

**Example**

` > COMPUTATION
>> CONVERGE
>>> accept : 20 CONSECUTIVE time steps that converge on ITER=1
<<<
<<`

**See Also**

` >> TIME | >>> ADJUST | >>> REDUCTION
`