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 Section 3.2: Module Section Up Chapter 3: Free Format Input Subsection 3.3.1: Control Parameters 

3.3 Control Section

The control section is defined by the Control element. This section defines all parameters that are used to control the evolution of the solution as well as parameters for the nonlinear solution procedure. These parameters are defined as child elements of the Control element and depend somewhat on the analysis as defined by the Module section. The control section defines the control parameters, the solver parameters, and optionally, the time_stepper parameters.
Example:
<Control>
    <analysis>STATIC</analysis>
    <time_steps>50</time_steps>
    <step_size>0.02</step_size>
    <solver>
        <max_refs>25</max_refs>
        <max_ups>0</max_ups>
        <diverge_reform>1</diverge_reform>
        <reform_each_time_step>1</reform_each_time_step>
        <dtol>0.001</dtol>
        <etol>0.01</etol>
        <rtol>0</rtol>
        <lstol>0.9</lstol>
        <min_residual>1e-20</min_residual>
        <qnmethod>BFGS</qnmethod>
        <rhoi>-2</rhoi>
    </solver>
    <time_stepper>
        <dtmin>0.0002</dtmin>
        <dtmax>0.02</dtmax>
        <max_retries>5</max_retries>
        <opt_iter>6</opt_iter>
    </time_stepper>
</Control>
 Section 3.2: Module Section Up Chapter 3: Free Format Input Subsection 3.3.1: Control Parameters 

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