ype">void</span> <a class="code" href="class_s_p_h_1_1solid__dynamics_1_1_fluid_viscous_force_on_solid_in_euler.html#af5782fa12e1fcc2a26b1784152f99967">Interaction</a>(<span class="keywordtype">size_t</span> index_i, Real dt = 0.0) <span class="keyword">override</span>;</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        };</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;</div><div class="line"><a name="l00095"></a><span class="lineno