62 lines
1.8 KiB
ReStructuredText
62 lines
1.8 KiB
ReStructuredText
=====================================
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Software Conventions and Limitations
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=====================================
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Units
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------
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All data in TSNet is stored in the following International System (SI) units:
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* Length = :math:`m`
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* Diameter = :math:`m`
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* Water pressure = :math:`m`
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(this assumes a fluid density of 1000 :math:`kg/m^3`)
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* Elevation = :math:`m`
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* Mass = :math:`kg`
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* Time = :math:`s`
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* Demand = :math:`m^3/s`
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* Velocity = :math:`m/s`
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* Acceleration = :math:`g` (1 :math:`g` = 9.8 :math:`m/s^2`)
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* Volume = :math:`m^3`
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If the unit system specified in .inp file is US units,
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it will be converted to SI unit in the simulation process.
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When setting up analysis in TSNet, all input values
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should be specified in SI units.
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All simulation results are also stored in SI units.
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Modelling Assumptions and Limitations
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-------------------------------------
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TSNet is constantly under development. Current software limitations are
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as follows:
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* Demands on the start and end nodes of pumps and valves are not supported.
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If demands are defined on these nodes in the .inp file, they will be
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ignored in transient simulation, and the simulation results may
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not be accurate due to discrepancies between the initial conditions
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and the first step in transient simulation. Warnings will be printed.
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* Multi-branch junctions on the start and end nodes of pumps and valves
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are not supported. It is assumed that valves and pumps are connected
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by pipes in series.
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* During transient simulation, demands are pressure dependent .
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* Pipe Friction coefficients are converted to Darcy-Weisbach coefficients
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based on initial conditions.
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* Pipe bursts and leaks occur only on the nodes.
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* Transient simulation relies on a feasible steady state solution;
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hence, it is essential to verify that the steady state simulation
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succeeds without errors.
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