BASEMENTBasic Simulation Environment for computation of environmental flow and natural hazard simulationLaboratory of Hydraulics, Hydrology and Glaciology (VAW)ETH Zurich | ![]() |
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Hi,
I tried to set up the initial condition for a simulation in a river, where the outflow boundary is a weir.
At the outflow boundary I put the weir_out_constant Boundary Condition, setting the Poleni factor and the weir elevation.
As inflow boundary I use a constant discharge and I set up an initial "dry" condition.
I tried to change the weir elevation and the minimum water depth, but the problem is still there.
When I start the simulation, I get a lot of MASS BALANCE PROBLEM: h = -5.51518 < 0.0
If I use another Boundary Condition, such as uniform_out or zero_gradient_out, I have no problems.
What could be the problem?
Thanks for your hep in advance
Nicola
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Hi Nicola,
did you check the elements that are giving you troubles? You can do that by running basement in debug mode.
I guess there is something wrong in the way you set up your downstream boundary condition, but it is hard to say without checking ouy your input files.
Cheers
Matteo
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