rce_from_fluid_</a>; </div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;            <span class="keyword">virtual</span> <span class="keywordtype">void</span> Interaction(<span class="keywordtype">size_t</span> index_i, Real dt = 0.0)<span class="keyword"> override</span></div><div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;<span class="keyword">            </span>{</div><div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#1