Improve physical geometry, fluid solvers, audio, and profiling

include/FluidSim/Silencer.hpp

@@ -46,7 +46,7 @@ inline Pipe1D make_silenced_exhaust(const ExhaustConfig& c) {
     add(c.outlet_length,c.diameter,c.diameter);
     auto pipe=make_profiled_pipe(sections,c.cell_length);
     for(std::size_t i=0;i<sections.size();++i) {
-        const int n=int(std::ceil(sections[i].length/c.cell_length));
+        const int n=profile_section_cells(sections[i].length,c.cell_length);
         for(int j=0;j<n;++j) { pipe.linear_resistance.push_back(linear[i]);pipe.quadratic_resistance.push_back(quadratic[i]); }
     }
     return pipe;