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From: S.Kummer <ste...@we...> - 2019-02-13 20:08:23
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Hi ANUGA users, I'm using the boyd_pipe_operator in a rainfall surface-runoff-simulation. - pipe diameter: 0.4 m - pipe length: 42 m - slope: 4 % - manning: 0.012 Here is the output of the culvert.print_timestepping_statistics() after a simulation time of 1530 sec: Structure report for Culvert__Nr1_DN400: -------------------------- Type: boyd_pipe inlets[0]_enquiry_depth [m]: 0.75 inlets[0]_enquiry_speed [m/s]: 0.75 inlets[0]_enquiry_stage [m]: 452.65 inlets[0]_enquiry_elevation [m]: 451.90 inlets[0]_average_depth [m]: 0.86 inlets[0]_average_speed [m/s]: 0.46 inlets[0]_average_stage [m]: 452.62 inlets[0]_average_elevation [m]: 451.77 inlets[1]_enquiry_depth [m]: 0.02 inlets[1]_enquiry_speed [m/s]: 0.22 inlets[1]_enquiry_stage [m]: 450.98 inlets[1]_enquiry_elevation [m]: 450.96 inlets[1]_average_depth [m]: 0.32 inlets[1]_average_speed [m/s]: 0.00 inlets[1]_average_stage [m]: 450.96 inlets[1]_average_elevation [m]: 450.65 Discharge [m^3/s]: 0.05 Discharge_function_value [m^3/s]: 4.24 Velocity [m/s]: 2.33 Outlet Depth [m]: 0.09 Accumulated Flow [m^3]: 42.36 Inlet Driving Energy 0.75 Delta Total Energy 1.67 Control at this instant: INLET CTRL Culvert is open channel flow we will for now assume critical depth -------------------------- The culvert crosses a road. In my depth-animation the road is overtopping although the culvert is in open channel flow and the full capacity of the culvert is obviously not reached!? Are the enquiry-values calculated at the given endpoints and the average-values as the average of the triangles which are taken in account? How is it possible that the discharge is 0.05 m3/s at a velocity of 2.33 m/s and a diameter of 0.4 m (continuity equation: Q = 0.2^2 * PI * 2.33 = 0.29 m3/s)? Cheers Stefan |