1D river simulations - parameters tab
    • 01 Aug 2022
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    1D river simulations - parameters tab

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    Article summary

    The Parameters tab sets the global system parameters. Note that these may also be specified in the data file. Any such values set within the data file (General System Parameters) will override the defaults in the 1D simulation window, although any values altered within the latter will take precedence.

    RiverSimulationsimagesparaimage017.jpg

    The parameters, meanings and their default values are as follows:

    Parameter

    Description

    Default

    Lower Froude Limit

    Supercritical flow is approximately modelled by phasing out the ∂A/∂x part of the convective acceleration term in the momentum equation between the values Lower Froude Limit and Upper Frounde Limit. (Except in Direct Method Transcritical Solver)

    0.75

    Upper Froude Limit

    Supercritical flow is approximately modelled by phasing out the ∂A/∂x part of the convective acceleration term in the momentum equation between the values Lower Froude Limit and Upper Frounde Limit. (Except in Direct Method Transcritical Solver)

    0.9

    Pivotal Choice Parameter

    Parameter that specifies the degree of matrix pivoting. Should not be altered by the non-expert user (not available for steady direct runs)

    0.1

    Matrix Dummy Coefficient

    Dummy coefficient to maintain the solution matrix structure. Should not be altered by the non-expert user (not available for steady direct runs)

    0

    Direct Method Convergence Parameter

    Absolute flow and stage tolerance value used in Direct steady Method (not available for other run types)

    0.001

    Minimum Depth of water

    Depth to which channel water depth is reset if it falls below this value (in metres)

    0.1m

    Average Water Temperature

    Water temperature (°C). Has no effect on hydraulic results

    10°C

    Global Matrix Dummy Coefficient

    Dummy coefficient to help maintain matrix structure within calculation engine. Setting to a small (positive) number may help improve matrix singularity issues.

    0

    Large results check

    Option to check outputs from matrix solver. If values exceed specified upper limit then simulation is terminated and fatal error is generated

    Off (no tick)

    Upper flow bound

    Upper limit for flow values output from matrix solver

    1 x 107

    Upper stage bound

    Upper limit for stage values output from matrix solver

    1 x 105


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