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TUFLOW Remapping: Difference between revisions

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Created page with "= Introduction = With the release of TUFLOW HPC (in 2017) and the continuous improvement of GPU hardware compute capability, there is an industry trend for models of higher re..."
 
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= Introduction =
With the release of TUFLOW 2020, the combination of Quadtree cell and Sub-grid sampling (SGS) has offered great flexibility to build a model with a range of mesh sizes. However, this has also create a need to "remap" the water level in large Quadtree cells to a DEM with much finer resolution. While we are developing high resolution SGS output in the future release, we have also added a new functionality in asc_to_asc utility to remap water level grid to a finer DEM grid. This page introduce how to use the asc_to_asc remap function, and also discuss the limitation of the method.
With the release of TUFLOW HPC (in 2017) and the continuous improvement of GPU hardware compute capability, there is an industry trend for models of higher resolution. As such, the 2D cell size in flood models is becoming smaller and smaller. Testing has shown in some instances reducing the 2D cell size may lead to model instability at 1D/2D SX locations. This page discusses this observation, the cause and available methods to correct the instability. Topics of discussion include: <br>
* 1D timestep selection <br>
* Use of a 1D Node to assign 1D/2D boundary condition cells <br>
* Use of SX 1D/2D boundary condition lines <br>
* Application of a SX Storage Factor <br>
* Use of SX 1D/2D boundary condition polygons <br>
These methods can be applied to both TUFLOW Classic and HPC using the 2017 release or newer. For the purpose of this demonstration TUFLOW HPC has been used.
 
=Base Case=
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