aquifer recharge

Hello,

I would like to know how to impose a one month recharge per year during several years.
Thank you

Hello,

there are 3 different ways to define a time varying rechege in FEFLOW.

1. Flow Materials --> "T-LIST":
Here you can define different time stages and assign different spatial distributions of recharge. You can use the "cyclic" option, so that you have only to edit one period of recharge and this is reused for later teime periods.
Be careful in the visualization of the recharge, you have to select the proper time step!

2. Definition via power function:
You can difine power functions (in the boundary condition menu) for recharge and join them to the material property data. Also in the power functions menu you could use the "cyclic" option.

3. "formula editor"
For some material properties you can define mathematical functions in the formula editor. Here you can also define a time dependency of recharge (e.g. a sinuos function of time).
There is no way to visualize the distributio nat a given time step in FEFLOW.
Be careful: you have to adjust the timestepping to this function! In opposite to the above described method time stepping is not influenced by this definition.

Zebra

Hello,
I use to define power functions for recharge (solution #2). It works pretty well except that a path location window pops up when joining the function to the material properties (via a trp file). it asks to "enter an existing directory for storing temporal time-dependent material data". I don't understand that window, feflow is not supposed to store any data somewhere else than in the .fem, is it?

The problem is that every times I open the model (.fem) that window pops up ... which is getting on my nerves.
Any suggestions?

Juliette

Hello,

if you use time varying material properties FEFLOW stores this in a temporary file.
By default this temporary file is saved in the "import+export" directory of your standard feflow directory.
I had once the same problem described by you since this directory was a read only directory.

What you should do is:
- Use a standard FEFLOW directory tree (i.e. save the *.fem file in a subdirectory "femdata" and assure that there does exist a directory named "import+export")
- check whether you have the permission to write files in that directory
(Sometimes it is not clear which is the actual standard directory of feflow. To check that go in the main menu  --> tools --> disk space, there you can see the actual path)

If you want to be independent from the standard feflow paths, you have to do some editing in your windows registry:
look for "HKEY_CURRENT_USER/Software/Wasy/FEFLOW/x.x/Global" and edit the „ProjectPath“ to some existing directory.


Zebra

Thank you Zebra. This really helps!
The import+export file was missing in the working directory (don't know why but it was easy to fix!).
thanks again,

Juliette

Zebra, Juliette,

Thank you for these explanations, as Juliette I used the second solution(power function) and  that walks well!
Once again thank you