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<title>ATC: fix_modify AtC control</title>
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<h1><a class="anchor" id="man_control">fix_modify AtC control </a></h1><h2><a class="anchor" id="syntax">
syntax</a></h2>
<p>fix_modify AtC control &lt;physics_type&gt; &lt;solution_parameter&gt; </p>
<p><br/>
</p>
<ul>
<li>physics_type (string) = thermal | momentum<br/>
</li>
<li>solution_parameter (string) = max_iterations | tolerance<br/>
</li>
</ul>
<p>fix_modify AtC transfer &lt;physics_type&gt; control max_iterations &lt;max_iterations&gt;<br/>
</p>
<ul>
<li>max_iterations (int) = maximum number of iterations that will be used by iterative matrix solvers<br/>
</li>
</ul>
<p>fix_modify AtC transfer &lt;physics_type&gt; control tolerance &lt;tolerance&gt; <br/>
</p>
<ul>
<li>tolerance (float) = relative tolerance to which matrix equations will be solved<br/>
</li>
</ul>
<h2><a class="anchor" id="examples">
examples</a></h2>
<p><code> fix_modify AtC control thermal max_iterations 10 </code> <br/>
<code> fix_modify AtC control momentum tolerance 1.e-5 </code> <br/>
</p>
<h2><a class="anchor" id="description">
description</a></h2>
<p>Sets the numerical parameters for the matrix solvers used in the specified control algorithm. Many solution approaches require iterative solvers, and these methods enable users to provide the maximum number of iterations and the relative tolerance. </p>
<h2><a class="anchor" id="restrictions">
restrictions</a></h2>
<p>only for be used with specific controllers : thermal, momentum <br/>
They are ignored if a lumped solution is requested </p>
<h2><a class="anchor" id="related">
related</a></h2>
<h2><a class="anchor" id="default">
default</a></h2>
<p>max_iterations is the number of rows in the matrix<br/>
tolerance is 1.e-10 </p>
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