Carlos Andres Rivera Villarreyes Global Product Specialist - FEFLOW

Hi Murugan, The solutions depends on how the data has been stored in the DAC file. If you set Observation Points before the simulation starts, then FEFLOW will create Mass Species for all the major ions defined in the PHREEQC files. Then you will get the typical charts, where each concentration breakthrough is exportable via right-click on the chart. If you decide to only save the results using PHREEQC output keys defined in the text files, FEFLOW will create nodal distributions with those values. You have all the information per each FEFLOW node and time step. The only workaround to create time-series is via Python, where you write your own scrip to go through the steps in DAC file, get the nodal values and export them. Cheers Carlos

Hi Mohamad You would require to store the river water levels as FEFLOW Time Series. If you have the river network as a polyline shapefile (or similar), you can use the option "Link to Parameter" (context menu of a selected map) to carry out a linear interpolation along the river lines and using the points with the river level time series. Take a look on this description: https://download.feflow.com/html/help81/feflow/09_Parameters/1D_interpolation.html If you have a valid support agreement, please reach out FEFLOW support team (mike.de@dhigroup.com). Cheers Carlos

Yes, with the latest FEFLOW 8.1, we strongly do not recommend to use the Open-Loop plug-in. The full functionality is implemented in the GUI. This will also warranty a robust model performance. Cheers Carlos

Hi Lydia, what is exactly the problem with the observation points import? Can you be more specific? I would strongly recommend to look and download the Introductory Tutorial. There we demonstrate the insertion of observation points in multiple FEFLOW slices. Carlos

If you see that the script has a line "import ifm_contrib as ifm", this means that it is not really using the standard IFM functionality. The script contains a layer above named "contribution", which is a community extension. FEFLOW standard IFM will give you all the arrays of results. These can be subsequently used by any graphical Python packages for visualization and/or plotting such as Matplotlib, PyVista, etc. You may want to visit our free self-paced course about FEFLOW Python integration. I have few official examples how to plot FEFLOW's results with Matplotlib. The link is below https://www.theacademybydhi.com/course-sessions/feflow---getting-started-with-feflow-python-interface-11600061-149  

Hi Emilia, Refinement is not necessary the solution. You should look for the Mesh Quality. How good is the mesh if you plot the Max. Interior Angle of triangles? For example, if you do the refinement in bad-shaped triangles, then the situation will become even worst. Why are you using the Error Norm (max.)? Is your problem converging?  Get in touch with MIKE Support (mike.de@dhigroup.com) and discuss your case in detail. Best regards Carlos Rivera

Hi Rachit, To understand better the case, can you elaborate how you are launching the 1000's simulations? Is this done under the FePEST framework? Or are you using your own script to do the job? The issue with the MPI can be related to several things, for example, you already have an MPI environment in place, which could conflict with FEFLOW's one. Or the script is not properly terminating the MPI instance. Best regards Carlos Rivera

Hi Lucien, If you are solving the groundwater flow equation with the option "Free" surface, then FEFLOW assumes that the elevation of Slice 1 coincides with the phreatic surface (Pressure = 0 kPa). Therefore, the model elevation will change accordingly during the simulation. You can solve the groundwater flow equation by using the "Phreatic" option or the Problem Class Richards. We have dedicated free training course about all these options. You can register with the link below: https://www.theacademybydhi.com/course-sessions/feflow---behind-the-flow-11600061-142 Best regards Carlos Rivera  

No, it is not possible. Hydrodynamics model for rivers cannot be solved with steady-state concept. If you prefer to work in steady, then you would need to operate only with FEFLOW, where the river heads are prescribed by the Fluid-Transfer BC. Best regards, Carlos

Hi Max, The problem is that SAMG did not converge properly. I see you are working with a RMS norm. This is practical for standard cases, but in situations, where you have specific "hot spots" (e.g. not convergence directly at the BHE locations), it will be much useful to work with a MAX norm. The Max norm will focus on the spots with maximum error, presumably the BHE locations. Alternatively, you can give a try with the direct solver PARDISO. Best regards Carlos Rivera