Computational Control Parameters

Computational Control Parameters includes options for specifying parameter values for variables used to control the behaviour of the computational engine within MIKE HYDRO.

Computational control parameters are used in the Basin simulation as criteria for solving the water quantity distribution.

The calculation of the flow in the river network for each time step requires an iterative procedure. The computation of the time step will finish when the con­vergence criteria have been reached. A convergence criterion is given for the flow on the branches and one for the remote flow control nodes. A maximum number of iterations is defined to ensure that each time step will be com­pleted within an acceptable amount of time. The default value is 150 itera­tions. A warning message will be issued when the computation of the time step cannot be achieved successfully within the maximum number of time steps.

·         Maximum number of iterations. Maximum number of iterations in solv­ing water quantity distribution. This corresponds to the maximum number each time step will be computed. This number will affect the computation time of Basin simulation. Please note that every time step is computed by at least 4 iterations.

·         Flow convergence criteria. Maximum change allowed in flow at each computation node between two successive iterations.

·         Control flow convergence criteria. Maximum difference allowed in flow between the calculated and target flow at remote flow control nodes. This parameter applies for both maximum and minimum remote control flow rules.

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