HPC FAQ: Difference between revisions
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= I have been given a model developed in older release and the results are different in a newer release. Why? =
If comparing Classic model with HPC, check the first question [[
In addition to above, there are numerous reasons why model results would be different between different TUFLOW releases, Classic or HPC regardless:
* General improvements to the solution scheme’s ability to handle shocks and steep slopes.
* New features that use GIS attributes previously reserved and unused. If these attributes were not populated with the recommended “reserved” value (usually 0 or blank), then they can cause unpredictable results in later releases.
* Numerous changes to the treatment of the default settings and values, e.g. different default viscosity formulation of default viscosity coefficients. For backward compatibility the “Defaults ==” command is available to run old models on new releases.
* Bug fixes.
Generally, there should not be substantial differences as the fundamental equations being solved are unchanged. If significant differences (>10% of depth change across the whole model) are observed then it’s most likely due to the last couple of dot points above. To identify the cause(s) for the change, the model can be run with the latest build for each release to identify in which release(s) the significant changes occurred. The changes for each release are documented in their release notes. Past releases and release notes are all available [https://www.tuflow.com/Tuflow%20Previous%20Release.aspx. here]
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