Denim Umeshkumar Anajwala

There are two options: Either you create a point shape file from the raster in GIS and use this as the basis for interpolation in FEFLOW, or you export the FEFLOW mesh nodes to a shape file, transfer the elevation from the raster to the points in ArcGIS and import the points again in FEFLOW, using an inverse distance weighting interpolation with only one neighbor. We usually prefer the latter option as it does not require the import of the huge point shape file generated from the raster in ArcGIS into FEFLOW.

Gemma,

memory will only affect the run time if not enough memory is available. Then the system will start swapping to the hard disk and the speed will reduce extremely. You can check for the approximate memory demand for the simulation using Info - Storage demand in FEFLOW.
Processor clock speed has an almost linear influence, i.e., the faster the processors, the faster the simulation. When writing results files for models with many but very quickly computed time steps also the disk speed may have an influence. For larger models this is usually negligible. To improve performance, I recommend to not render the results on screen for each time step as the visual output will slow down the simulation, too.

By default, FEFLOW runs as many threads simultaneously as cores are found. So a quad core would be more efficient than a dual core. However, actual speedup highly depends on the type of model and the time needed for different parts of the simulation. For example, parallelizing the matrix setup is more efficient than parallelizing the equation solver (only SAMG works in parallel, anyway). Output on screen is currently not parallelized at all.

Hallo everybody
I’m working with 3D geothermal modelling (ver. 5.4): the injection and extraction wells filter partially the aquifers. So, I put one layer for every bottom level of well.
Moreover for the best representation of wells, I used the 2nd bc.
Any help or suggestions appreciated!

Regards!

Matteo

There's a trick to do so: From the dac file, you can export the cross section as a new (2-dimensional) dac file by choosing the 'dac' option instead of '2D' or '2D+'. Then you can do all the exports from the new 2D dac file.

Does the river have transient properties, or is the water level time-constant? If you're still having trouble, pls. send an email to our tech support (support@dhi-wasy.de), if possible with the model file (up to 8 MB). If the file is larger, our support team will tell you where you can upload the file.

No, the time stepping procedure does not directly consider the Courant number as a criterion. The only criterion is the error tolerance defined in 'temporal & control data'.

Indeed in/outflow on top/bottom is only active on the top/bottom layer. On layer 3, pumping for irrigation would have to be input as wells.
Another option would be to use a layer with a constant thickness in combination with the source/sink parameter. Source/sink is a source or sink of water per volume, therefore this would only work well if the layer has a constant thickness that can be taken into account.

As a comparison, it might be good to run the model with automatic time stepping, if run time allows.

The in/outflow on top/bottom parameter in 3D models (source/sink in 2D) can be set as negative. This is the typical solution in case of irrigation when the exact location and pumping rate of the irrigation wells is not known. The water demand is then often taken from plant growth and transpiration calculations, considering the crop type.