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/usr/share/xscreensaver/config/euler2d.xml is in xscreensaver-data-extra 5.15-3ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="euler2d" _label="Euler2D">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="10000"
          convert="invert"/>

  <number id="count" type="slider" arg="-count %"
           _label="Particles" _low-label="Few" _high-label="Many"
          low="2" high="5000" default="1024"/>

  <number id="eulertail" type="slider" arg="-eulertail %"
           _label="Trail length" _low-label="Short" _high-label="Long"
          low="2" high="500" default="10"/>

<!--
  <number id="eulerpower" type="slider" arg="-eulerpower %"
           _label="Power" _low-label="Low" _high-label="High"
          low="0.5" high="3.0" default="1.0"/>
-->

  <number id="cycles" type="slider" arg="-cycles %"
           _label="Duration" _low-label="Short" _high-label="Long"
          low="100" high="5000" default="3000"/>

  <number id="ncolors" type="slider" arg="-ncolors %"
            _label="Number of colors" _low-label="Two" _high-label="Many"
            low="2" high="255" default="64"/>

  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
Simulates two dimensional incompressible inviscid fluid flow.

http://en.wikipedia.org/wiki/Euler_equations_%28fluid_dynamics%29
http://en.wikipedia.org/wiki/Inviscid_flow

Written by Stephen Montgomery-Smith; 2002.
  </_description>
</screensaver>