_01_real_01_4.html">StdVec&lt;Real&gt;</a> smoothing_length_;</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;            <a class="code" href="class_std_large_vec_3_01_vecd_01_4.html">StdLargeVec&lt;Vecd&gt;</a> viscous_force_from_fluid_;</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;            <span class="keyword">virtual</span> <span class="keywordt