Denim Umeshkumar Anajwala

The zero isoline can be understood as the groundwater table. It should actually fit to the current hydraulic heads.

Thanks Soren. I guess that you're using the semi-analytic Eskilsson/Claesson method. With this, it should work perfectly fine through IFM. Applying the fully transient Al-Khoury approach, however, strictly speaking, the temperature values of the inflow / outflow pipes in the BHE would have to be switched when changing flow direction (which is not possible via IFM). Just changing the connection, the inflow pipe will stay the inflow pipe, rather than (as in reality) making the former outflow pipe the new inflow pipe. This will only affect the results during a very short period, though. So if you only switch seasonally, it should not pose a problem.

Indeed there is a relationship the other way round, too. While the head depends on discretization when using a Well BC, the flow will depend on discretization when using a Head BC.

Dear Anne,

The respective video was based on FEFLOW 5.x and therefore is no longer useful nowadays. Do you have a specfic question about the assignment?

Best regards,
Peter

It is, but it is much less so compared to the 'old' flow rate method.

Most unfortunately, this is currently not possible. I fully understand that this is how many systems are nowadays operated, and most probably there will be even more of these installations. We've put this on the wish list, but I cannot promise anything yet in terms of timing.

These are at least the most straightforward options.

Alternatively, if the lake water and groundwater levels influence each other (as groundwater is the only water source for the lake), you could also adopt a concept of simulating the lake by using a high-conductivity zone in the model (without and BC), or by using the plug-in IfmLake available from DHI-WASY that provides the possibility of simulating the lake as linked to the FEFLOW model.

The status is still the same: You can refine the mesh and manually move a node to a well location, but there's currently no automatic way of adding new nodes at a well location. We will very probably provide a way more general solution in the future, but it is still to early at this time to provide more details, not to speak of a time frame.

hi Feflow-forum,

I have problem regarding the mass transfer rate, in the Feflow 6.2 help there is no correct explanation on that:

Regarding the Mass-tranfer BC it's written in the help that

Q[sub]mass[/sub]    =    A      *      transfer rate      *    (c[sub]ref[/sub] - c)

the units in 3d are described as follows


[g/m³]    =    [m²]    *        [m/d]        *  [g/m³]    ? ? ?


How is this possible? Am I blind?

What is the definition of the mass transfer rate (compared to the definition of Transfer Rate (fluid), where in the Feflow-help its written that "The transfer rate is a conductance term describing the properties of a clogging layer. It is defined as  ? = K/d"?

Can somebody please provide some help? Thank u so much!