TUFLOW Stability Troubleshooting: Difference between revisions
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* Connect cells that have a constant water level (perpendicular to flow) as the water level boundary will be averaged from the connected cells. Connecting cells that are not perpendicular to the flow could mean the average water level upstream of the culvert to be higher that in reality and downstream average water level will be lower.
* Multiply default SX boundary storage with the 'a' attribute.
* Use polygon SX for more stability, see further guidance <u>[[
* Use Sub-Grid Sampling (SGS) to improve volume calculations upstream and downstream of the structure.
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=== Notes for all features===
* Use the latest available TUFLOW release.
* Use Sub-Grid Sampling (SGS) if using HPC. This allows for more accurate calculations of flow and water level that transitions into the 1D features
* Double precision might be used, however this would cause models running slower and other measures are recommended to try first.
* Lower 1D timestep can be sensitivity tested, however the timestep should still remain within reasonable bounds. If the 1D timestep is required to be very small for stability reasons, usually other measures can be taken to improve the stability and consequently run time of the model.
* If using TUFLOW Classic, 2D timestep should be between 1/5 and 1/2 of the cell size in metres. Lowering 2D timestep within this range might be beneficial for stabilising 1D/2D links.
== My model reports very high mass balance error at the beginning, then it lowers. Is it unhealthy? ==
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