coarse.html

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<TITLE>The Coarse Grid</TITLE>

<H1>The Coarse Grid</H1>

 <P>The coarse grid is a tensor product grid defined by three (in 3D)
resp. two (in 2D) one-dimensional grids. Each of these one-dimensional
grid may be described by an explicit list of points and a number
describing a regular subdivision.

<H1>
<A NAME="x">x</A>,
<A NAME="y">y</A>,
<A NAME="z">z</A>: 
Explicit List of Coordinates
</H1>

 <P>These three lists of float values may be defined in the <A
HREF="extern.html">external control parameter file</A> by statements
like

<PRE>
x(0,1);
y(0,1);
</PRE>

 <P>(see <a href="../test/test.ibg"> test.ibg </a>).

 <P>The values have to be placed in increasing order.

 <P>There may be maximal <B>MaxValues</B> (defined in <a
href="../src/ibgext.c"> ibgextref.c</a>) values in each list.

<H1>
<A NAME="regular">regular</A>,
<A NAME="regularX">regularX</A>,
<A NAME="regularY">regularY</A>,
<A NAME="regularZ">regularZ</A>,
Regular Refinement 
</H1>

 <P>An additional regular refinement for the coarse grid may be also
defined. <B>regular</B> is an abbreviation for regular in each
direction. 

 <P>If the related parameter is zero, there will be no additional
refinement. Else, the number defines the number of additional points
on each segment of the "coarse" coarse grid.

<H1>Example</H1>

<PRE>
y^
 |
1*---+---+---*-----------+-----------+-----------*
 |   |   |   |           |           |           |
 +---+---+---+-----------+-----------+-----------+
 |   |   |   |           |           |           |
 *---+---+---*-----------+-----------+-----------* -&gt;x
0            1                                   4 
</PRE>

 <P>would be the result of

<PRE>
x(0,1,4);
y(0,1);
regularX = 2; 
regularY = 1; 
</PRE>