• Rate Budget - Imbalance problem (transient model)


    I’m trying to run a transient model using the Phreatic method in order to calibrate it (It’s an open pit mine dewatering), but I have noticed very large flow imbalance erros in each time step (whether Varying or Automatic time-step control). The particularity of this model is that I represented the elements out of my area of interest as inactive elements, as you can see in the Picture.

    I tryed to delete the inactive elements (because I think the Imbalance errors are related to this inactive elements), and I ran it at the same way. It really has improved the imbalance, but the problem is that it is not possible to assign the Sy value (Drain-/fillable porosity – “Specific Yield”) when I use the model with this deleted elements, and I need this parameter in order to achieve better results.

    Do you have any tip? Is there any other way to improve the imbalance?

    Enclosed you have an image showing the imbalance results using the model with the inactive elements and the model without them (deleted elements).

    Thank you in advance!!
  • Problem when trying to prepare a pit geometry

    When the 3D layered mesh is already constructed, is it possible to create a new selection using a reference topography? In this case, I am trying to prepare a pit geometry, but I have already a constructed and calibrated model in steady-state. Now, I want to calibrate it in transient. I have tryed to create the open pit selection with the “user data”, but when I link the topography shape to my nodal distribution, the option “Data Regionalization Method” doesn’t appear in the “Parameter Association” dialog, and then it is not possible to choose the interpolation method. Is there any other way to create this selection in order to inactivate the pit geometry? Is this happening because I don’t have a supermesh? (this model was created in Leapfrog software, and then imported to feflow, that’s why I don’t have a supermesh).

    Any help would be much appreciated.
  • Re: Problem with hydraulic head BC with constraint

    Never mind, i've run it for a while in transient and it worked.
    But when i run it in steady-state, it's still not working.  :-\
  • Re: Problem with hydraulic head BC with constraint

    Sorry about my question, but I am new in FEFLOW. I’m triying to run it in transient, but it is taking too long. Do I have to change any other parameter in order to run it in transient or just switch to Transient in the Problem settings?

  • Problem with hydraulic head BC with constraint

    I am trying to use an Hydraulic-head BC with max. Flow-rate constraint to simulate a spring in my model . It’s an unconfined aquifer, with phreatic surface, and i’m running it in a steady state. The problem is that this BC is not working (i.e. when i run the model, the water level at this point remains high, above the topography).

    In other parts of the model, this BC is working normally, but speciffically at this point it is not working, and I would like to know how to solve this problem.

  • Re: in-/active option

    Thank you very much! The phreatic surface was really being simulated with "movable" option.
  • in-/active option


    I built a geological model in Leapfrog software, where I built the mesh and put the hydraulic conductivities. It’s a layered 3D mesh, in the extention .fem. When I open this model in Feflow 7.0, I don’t see the in-/active elements option in the data panel, and I need this tool to inactivate the elements that are out of my area of interest. Where can I find this tool?

    Instead of seeing the in-/active option, I see a “Reference elevation” in Geometry --> Data Pannel. What does it means?

    Thank you.
  • Separating Observation Points in different groups

    Dear all,

    I would like to know if it is possible to separate the observation points in different groups in order to analyze Hydraulic Head Scatter Plot separately, for each group.

    Thanks in advance for the answers and comments.