• RE: How to add base flow data from a river to FePEST.

    Hi Billy,
    FePEST will recognize all nodal selections marked with the option "Budget-History charting". The option is found with a context menu of the specific selection in the FEFLOW GUI.
    Subsequently, FePEST will offer you the options Fluid Rate/Period from the Obs. Def. section in the Problem Settings dialog.
  • RE: My panel Data has no option for inactive cells

    The reason could be that you are solving the flow equation by using "Free and Movable" in the Problem Settings dialog. Inactive elements are not supported under this approach.
  • RE: Ifmlake plug-in

    Hi Robin, I would recommend you to get in touch with our technical support team at mike.de@dhigroup.com.


    Hi Joshua,
    Typically, discrete features elements (DFEs) are fully coupled to the matrix. That is the default set-up, i.e. whatever happens in the pipe, it will also happen "outside". However, the exchange between the DFE and the matrix can be controlled. I would recommend you to look the online help system: http://www.feflow.info/html/help75/feflow/09_Parameters/DFE/nodesplit.htm
  • RE: observation history (time series ) of soil moisture and saturation

    Hi Yonas,
    Your post may not have came all the way. FEFLOW supports the connection of historical data (measurements as constant and/or time series) to any observation point. Data can be linked to process variables for the flow (head, pressure, moisture, saturation), mass transport (any species concentration), heat transport (temperature) and groundwater age transport (age, lifetime expectancy and exit probability).
  • RE: ifm of in/outflow on top/bottom

    Hi Bohan

    The API is named IfmSetMatFlowRechargeValue. You can find below the documentation for both C++ and Python, respectively:


  • RE: specific storage

    Specific storage (compressibility) follows the standard definitions in hydrogeology.&nbsp;Specific storage describes the change in volumetric water content in an aquifer induced per unit change in hydraulic head under saturated conditions. Along with specific yield, specific storage describes the storage properties of an aquifer. As in unconfined layers specific yield typically exceeds specific storage by far, the influence of this parameter in aquifers with phreatic surfaces is usually negligible.<br> You can find all the parameters described in the online help:<br> http://www.feflow.info/html/help75/feflow/09_Parameters/Material_Properties/flow_parameters.html
  • RE: disapering mesh

    The most probable is that the cache file is somehow damaged e.g, saving was interrupted, etc. You can delete the *.cache file, open the FEM file and FEFLOW will recreate the cache file again. If this does not help, please contact support.
  • RE: PETSc guidance?

    We will make the test cases available soon. Thank you for understanding. What I can say for now is that the performance gain in PETSc with&nbsp; the GPU-accelarated AMG method becomes significantly visible for large FEFLOW models (e.g. at least with 1 million elements). This could be even a factor of 2.
  • RE: PETSc guidance?

    Hi Assaf,<br> Indeed, PETSc may be much more commonly used in Linux OS, but the operation in Windows is also supported (see <a href="https://petsc.org/main/install/windows/">PETSc documentation</a>). You can get a short description of PETSc suite methods being implemented in FEFLOW 7.5 in the <a href="http://www.feflow.info/html/help75/feflow/08_ProblemSettings/equation_system_solver.html">online help</a>. We are planning to extend all this documentation in the near future.&nbsp;In few words, FEFLOW Equation-System Solver page in the GUI includes: (1) PETSc Krylov-subspace solvers (iterative solver in addition to PCG), (2) PETSc library AMG solvers and (3)&nbsp;PETSc library AMG solver with <a href="https://hypre.readthedocs.io/en/latest/solvers-boomeramg.html#">Boomer AMG from Hypre</a>. The latest option supports GPU-accelerated AMG under Linux. GPU implementation is based on CUDA framework, which the support of this is mandatory in the graphic card.<br> If you would like to test this from the console, feflow75c has new arguments: <strong>-solver</strong> [pardiso|pcg|samg|pksp|pamg] and&nbsp;<strong>-gpu</strong> [yes|no].&nbsp;<br> In case there is no possibility to access to Linux instances, FEFLOW GUI (Windows) offers the cloud-deployment with a pre-defined Linux configuration dedicated for GPU acceleration. This is available through the new Cloud Simulation panel in FEFLOW 7.5.<br> <br> In case of more details are required, we can discuss further through the technical support channel (mike.de@dhigroup.com).<br> <br> Cheers<br> Carlos<br> <br> <br> <br> <br> &nbsp;