power SDO density error SDO density SDO density W m^-3 m^-3 m^-3 m^-3 experiment experiment 2d fluid sim plug flow sim 0.5 1.87720133151269E20 1.08958018807726E19 3.25022421011451E20 7.08129944965093E20 1 3.05494412070838E20 2.60438669863724E19 4.50943800451762E20 1.28275620349535E21 1.5 3.53124045160908E20 3.49397527447945E19 5.13081495842882E20 1.48871314213073E21 2 4.08323526554504E20 4.6083146768338E19 5.52417482231074E20 1.68492041229846E21