With the release of FEFLOW 8.1, the Open-Loop plugin, where you fix the
temperature difference becomes obsolute. You can do now everything within the
graphical interface without the plug-in. Please watch the video tour below:
MIKE 2024 | FEFLOW | Geothermal Modelling Without Limits
With the piFreeze instalation, you get automatically the user manual. In the
PDF, you will find the description of the settings required.
The manual should be available in the FEFLOW installation, by default as
C:\Program Files\DHI\2024\FEFLOW 8.1\modules64
The documentation of SMESH files is available in this link:
I have attached an example of a cube with top elevation (-5 km) and bottom
elevation (-41km). The SMESH can be used to described a closed volume, but you
can use also used to represent surfaces. In FEFLOW, if you have a 3D model (e.g.
layer-based), you can store a Face Selection and then export the faces as SMESH
(simply right-click on the selection name). This is quite practical to learn the
file format behind SMESH, or even quickly build SMESH files using FEFLOW.
Slices in FEFLOW represent the top and bottom of a geological layer. Depending
on the conceptual model, you need to decide how many geological contacts. If you
had the chance to look the exercise posted above, the example has 3 layers,
therefore you need the elevation points for 4 slices.
The problem is not the format. if you can display the file in FEFLOW, then it
can be understood by the mesh generator. The problem is that the GOCAD surface
intersects with the border faces of your 1 layer model. The repair operation is
only available via the 3D Supermesh workflow. In practical terms, you would need
to reduce the volume in GOCAD and then try to mesh it again in FEFLOW.
I would recommend you to take a look the FEFLOW Introduction Tutorial:
FEFLOW works only with projected coordinates. You need X and Y in meters (or
ft). The task is not FEFLOW related. You will find tons of materials and
tutorial in internet about coordinate transformation.
Not surely whether I understood entirely. Is the problem occuring in a FEFLOW
model being coupled to TRNSYS? Or are you using also in the "uncoupled" problem?
Please note that the plug-in is not anymore supported by DHI.
You may want to take a look on our free self-paced course "FEFLOW – Getting
started with FEFLOW Python Interface", where exactly this task is explained
through a working example. Registration link is below:
The plug-in should come with some help. If not, I copy below the text.
The OpenLoop plugin is designed for applying a time-varying temperature
differential between groups of abstraction and injection boreholes for open-loop
It is capable of handling more than one group of extraction/injection pairs
simultaneously, using separate temperature differentials for each group. Within
each group, extraction as well as injection can take place in an unlimited
number of mesh nodes. The module can also deal with systems where extraction and
injection nodes are inverted during the simulation time.
Furthermore, the application of the module for any group can start at any time
during the simulation run. Before that time, temperature conditions from the
model setup are used for the infiltration bore(s). This might be useful for
representing observation data (real injection temperatures) in the first phase,
while using calculated injection temperatures for the prediction phase.
The OpenLoop plug-in can also be used for applying a concentration differential
in mg/l. The module support thermohaline (heat and mass transport) simulations
and multi-species mass transport..
1. All time-varying temperature and concentration differentials are defined
as time-varying power functions in FEFLOW. For each system of
injection/extraction nodes and each process variable (temperature, each species
concentration) a separate time-varying power function has to be prepared, even
if differentials in different systems or for different chemical species are
2. A nodal reference distribution with the name 'OpenLoop' is created to
identify participating nodes for a temperature differential. For single-species
mass transport, the distribution is called 'OpenLoop Mass', for multi-species
transport 'OpenLoop Mass 1' for species 1, 'OpenLoop Mass 2' for species 2,
etc..In these reference distributions, all nodes belonging to a specific group
(injection and extraction nodes) are assigned a value equal to the number of the
time-varying power function containing the corresponding temperature or
concentration differential. All other nodes need to be given values less than or
equal to 0 (default in FEFLOW is -99999 = nodata). Be careful with mesh
refinement: In case of refining the mesh after assigning the power function
number, the data interpolation will lead to a number of nodes with non-zero
values around the wells, too.
3. A nodal reference distribution with the name 'OpenLoop AutoOn' may be created
to postpone the automatic boundary condition setting / removal on certain nodes.
All nodes with a later start should be assigned the start time [d] for automatic
temperature calculation. All other nodes in the distribution shall have zero or
negative values. This option can be useful for simulations whose first part is
based on observation data for injection wells, while the second predictive part
is to be run based on a temperature or concentration differential.
In each time step, the module will calculate the average abstraction temperature
or concentration. The calculation is done separately for each group, and
averaging is done based on the contribution to total energy or contaminant mass
abstraction by pumping from each extraction node.
The temperature or concentration differential derived from the time-varying
power function associated to the group is added (+) to the average
temperature/concentration, and the result is used to set a fixed
temperature/concentration (1st kind) boundary condition at the injection nodes.
The temperature/concentration boundary condition is adapted to the current
extraction temperature/concentration and temperature/concentration differential
before each time step of the simulation.
A time-stepping control scheme integrated in the plug-in ensures that all time
steps in the temperature differential functions are met exactly if the model is
run based on automatic time stepping.
It will be helpful if you describe the parameter used and the workflow.
In the attached image, you can see that FEFLOW recharge applied as In/outflow on
top/bottom takes into consideration the area only.
I believe you are using other parameter, applying an expression to the
parameter, or other configuration, which could cause the unexpected values. In
case you have very specific questions about your model, the technical support
(firstname.lastname@example.org) can take provide you detailed guidance.