SN_fields.xml

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<section id="Section-Tasks-FieldsEquations">
  <title>The Fields &amp; Equations Page</title>
  <para>
    The Fields &amp; Equations Page specifies which &fields; are
    defined on the &mesh; which &equations; are active.  It has three
    parts, as shown in <xref linkend="Figure-FieldsPage"/>.  The
    Subproblem Chooser at the top of the page specifies which
    &subproblem; is being operated upon.  The <link
    linkend="Section-FieldPane">Field Pane</link> sets various
    properties of the &fields;.  The <link
    linkend="Section-EquationPane">Equation Pane</link> activates
    &equations;.
  </para>
  <figure id="Figure-FieldsPage">
	<title>The Fields Page</title>
	<mediaobject>
	  <imageobject>
	    <imagedata fileref="FIGURES/gui/fields_page.png"
                   contentwidth="810px" format="PNG"/>
	  </imageobject>
	</mediaobject>
  </figure>

  <section id="Section-FieldPane">
    <title>The Field Pane</title>
    <para>
	  The Field Pane specifies which &fields; are defined on the
	  &subproblem;, and sets attributes of those &fields;.  The
	  checkboxes for each &field; correspond to commands in the <xref
	  linkend="MenuItem-OOF.Mesh.Field"/> menu.
	  <itemizedlist>
	    <listitem>
	      <para>
	        Toggling the <guibutton>defined</guibutton> checkbox <link
	        linkend="MenuItem-OOF.Mesh.Field.Define">defines</link>
	        and <link
	        linkend="MenuItem-OOF.Mesh.Field.Undefine">undefines</link>
	        the &field;.  The &mesh; only stores values for defined
	        &fields;.
	      </para>
	    </listitem>
	    <listitem>
	      <para>
	        Toggling the <guibutton>active</guibutton> checkbox <link
	        linkend="MenuItem-OOF.Mesh.Field.Activate">activates</link>
	        and <link
	        linkend="MenuItem-OOF.Mesh.Field.Deactivate">deactivates</link>
	        the &field;.  The &equations; only solve for active
	        &fields;.
	      </para>
	    </listitem>
	    <listitem>
	      <para>
	        &oof2; <link
	        linkend="generalized-plane-strain">generalizes</link> the
	        standard concept of plane-strain to apply to arbitrary
	        coupled &fields;.  Toggling the
	        <guibutton>in-plane</guibutton> button determines whether
	        or not the &field; has out-of-plane derivatives, by
	        invoking <xref
	        linkend="MenuItem-OOF.Mesh.Field.In_Plane"/> or <xref
	        linkend="MenuItem-OOF.Mesh.Field.Out_of_Plane"/>.  The
	        counterpart to generalized plane-strain, <link
	        linkend="Section-Concepts-Mesh-plane-flux">plane-flux</link>,
	        is invoked by activating the appropriate equation in the
	        <link linkend="Section-EquationPane">Equation Pane</link>.
	      </para>
	      <para>
	        A &field; that is in-plane on one &subproblem; in a &mesh;
	        must be in-plane on all &subproblems; in that &mesh;.
            Toggling the <guibutton>in-plane</guibutton> for a field in one
            &subproblem; will change its state in all &subproblems;.
	      </para>
	    </listitem>
	  </itemizedlist>
    </para>
    <para>
	  The <guibutton>Copy Field State</guibutton> button at the bottom
	  of the pane allows the current set of checkbox settings to be
	  copied to another &subproblem;, possibly in another &mesh;.
    </para>
  </section>
  <section id="Section-EquationPane">
    <title>The Equation Pane</title>
    <para>
	  The Equation Pane simply contains a list of the &equations; that
	  &oof2; can solve, and checkboxes which <link
	  linkend="MenuItem-OOF.Subproblem.Equation.Activate">activate</link>
	  and <link
	  linkend="MenuItem-OOF.Subproblem.Equation.Deactivate">deactivate</link>
	  them for the current &subproblem;.  &equations; will be solved
	  only if they are active, if the &fields; they use are defined,
	  and if there are &material; &properties; in the &subproblem;
	  that make contributions to them.
    </para>
    <para>
	  The <guibutton>Copy Equation State</guibutton> button at the
	  bottom of the pane copies the current set of active &fields; to
	  another &subproblem;, possibly in a different &mesh;.
    </para>
  </section>
</section>
    

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