• Export rate budget from .dac for nodal selection at all time steps


    I would like to export the full rate budget for a nodal selection from a .dac file at all time steps of my simulation. In the context menu of the Rate Budget panel, I only have the option of exporting the values for the current time step. Is it possible to export the budget for all time steps at once?

    Thank you!
  • Discrete Feature Intersections


    I'm interested in modeling an underground tunnel system using a series of Discrete Features, which will intersect a fault system that I also plan to model as a Discrete Feature. Is an intersection of two Discrete Features possible or will it lead to issues with the model?

    Thank you!
  • Re: Working with .dxf files

    1. This is something I have yet to decide on, but I think that it would be better for me to fully discretize the workings and use seepage nodes so that I can simulate the progressive drilling of the tunnel.

    2. I am using a .dxf file that represents the underground workings. I realized that I had to convert this to supermesh lines, though now when I try and generate a mesh (using the Triangle mesh generator) it throws the error "Invalid mesh topology near point x=20715, y=18640.2!". The supermesh lines cross over each other (as the workings exist at the same x y coordinates at different depths), could this be responsible for the error I am getting?

    3. I don't receive an error when importing the file.

    4. I am using FEFLOW

    Thank you, Bjorn.
  • Working with .dxf files


    I am currently developing a model to assess inflow to an underground mine. The model domain will be roughly 14x8 km with the mine located in the middle (total extent of mine tunnel system being 3x1 km). I have a .dxf file representing the underground workings, but am unsure of how to work with it in FEFLOW and mesh around it as I have not used this type of file before. Some of the questions I have include:

    -How do I horizontally discretize the mesh around the underground workings? Importing the file to FEFLOW has it displayed as an AutoCAD DXF File in the Maps panel and not an element in the supermesh, meaning that I cannot discretize more finely around the workings.

    -How do I properly manipulate the layers passing through the geometry of the mine so that, when I assign my seepage nodes, they are properly located?

    Thanks in advance.

  • Re: Even mass distribution along multilevel well

    Great idea, thank you!
  • Even mass distribution along multilevel well

    I'm using a multilayer well to simulate density-dependent brine injection in a deep, confined formation. I do this by assigning the MLW boundary condition to the full thickness of the formation and apply a specified Mass-concentration BC (of concentration C[sub]0[/sub]) to the bottom node of the MLW.

    In theory, I feel that this should distribute the mass evenly along the length of the MLW, causing the same concentration of mass/solute to be injected into the model regardless of which slice I am looking at. In reality, only the bottom slice (on which the Mass-concentration boundary is located) do I see the full concentration, C[sub]0[/sub], that I want to simulate. As I pass upwards in the model through each slice, the concentration around the well decreases. Is there a way for me to have the concentration of the injected brine be constant along the length of the well as it enters the model regardless of the slice? Could I accomplish this by assigning Mass-concentration BCs of C[sub]0[/sub] to each node that makes up the MLW, or would this result in a greater amount of mass to be added to the model than I desire?
  • Multilayer well parameterization

    I'm working on integrating several multilayer wells into a model I'm building, but am a bit confused as to how they are parameterized; am I assigning values to the void space that makes up the wellbore? In the Multilayer Well Editor I see that it's possible to modify the values for specific storage, density ratio, dispersivity, etc. What values should be used? I realize it's likely case specific, but is it suitable to leave them as the default values, or should I assign the same values to the well as were given to the formation that the well targets?

  • Referencing nodes in the expression editor

    I'm trying to assign a constant head boundary that increases as a function of depth to a border with varying elevation and using the expression editor to do so. The equation I'm trying to input is

    head = 600 + 0.0035(E[sub]Top[/sub] - E[sub]Current[/sub])

    where E[sub]Current[/sub] is the elevation of the node the head boundary is being assigned to, and E[sub]Top[/sub] is the elevation of the node in the same location but on the top slice. I'm able to use the expression editor to reference the current node (using Mesh>Node Date>Current node number), but am unsure how to reference the node on the top slice. Is anyone familiar with the syntax the expression editor uses who would be able to shed some light on this?

  • Potential error in reference density default value

    I've been running some mass transport models recently and noticed anomalously high fluid densities, several orders of magnitude higher than expected. Looking through the Transport Settings, I see that the default value for reference density is 9.99793e+08 g/m[sup]3[/sup]. Is this a potential error? Shouldn't this value be  e+05 instead? And if so, could this be changed so that others don't experience the same confusion that I did? I'm using FEFLOW 7.0.
  • Re: Multilayer well BC to simulate a horizontal well

    Excellent, thanks for the prompt response!