HPC FAQ: Difference between revisions
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= I know TUFLOW Classic, do I need to be aware of anything different with TUFLOW HPC?=
Yes! TUFLOW Classic tells you where your model has deficient or erroneous data, or where the model is poorly set up by going unstable, or producing a high mass error (a sign of poor numerical convergence of the matrix solution). The best approach when developing a Classic model is to keep the timestep high (typically a half to a quarter of the cell size in metres), and if the simulation becomes unstable to investigate why. In most cases, there will be erroneous data or poor set up such as a badly orientated boundary, connecting a large 1D culvert to a single SX cell, etc. <br>
HPC, however, remains stable by reducing its timestep and does not alert the modeller to these issues. Therefore, the following tips are highly recommended, otherwise there will be a strong likelihood that any deficient aspects to the modelling won’t be found till much further down the track, potentially causing costly reworking. So, it’s very much modeller beware!
* Use of excessively small timesteps is a strong indicator of poor model health (see discussion further above).
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