• ### Re: Making element groups

Thank you Peter!

Kind regards.
• ### Making element groups

Hi! :)

I'm almost done with my thesis model (yay!) and I'm now addressing the water recharge issue.

My idea is to make from element selections (shown in attached picture), element groups, so I can make a mathematical expression for recharge based on lithology. Is it possible? and how?

I'd love to do something like Q=m*Z+n but with 'if' statements based on lithology. So in summary it'd be like:

if group==rock1: Q=m1*Z+n1
else group==rock2: Q=m2*Z+n2

Is it possible to make it?

Update: I know it is matter in this case to select and apply different equations, but I think this 'if' feature in FEFLOW has a lot of potential.

Kind regards.
• ### Is there a way to get values of nodes in FEFLOW?

Hello again! :)

I'm wondering if there's a way in FEFLOW to 'store' different values (head, pore-pressure, darcy vel, etc) in several nodes in order to plot them afterwards?

My project is about assessing the water inflow into a tunnel and it'd be splendid to have 'monitoring nodes' to plot their values in function of distance of the tunnel.

Kind regards  ;)
• ### How to introduce fractures in already meshed domain

Hello! :) I have a question:

1) Is there a way to introduce fractures/joints in an already meshed FEFLOW model? (.fem file). If so, how would the procedure be?

My project is fully unstructured tetra elements so I don't know how to do it. I tried to set fractures before meshing (supermesh elements) but I failed, the geometry couldn't be meshed.

The geometrical model is particularly difficult since I have a tunnel inside the hydro-geological region and the fractures go through the tunnel as well, which has deactivated elements. Is there a  way to handle this situation?

Thanks in advance, kind regards.
• ### Re: How does FEFLOW handle Dirichlet BC with variable elevations?

Peter,

Once again, thanks so much!

Kind regards :)
• ### How does FEFLOW handle Dirichlet BC with variable elevations?

Hi!

I have 2 queries related to BCs, both more or less theoretical questions:

1) How does FEFLOW handle the fact of variable elevation at the boundary of a model, when you set a fixed head boundary condition?

It is important for me, because I want to model a big river with Dirichlet BC, but I want to maintain  a reasonable distance (let's say 1-2 [m]) from the elevation of the topography at the boundaries of the model. Is there a way to handle this? maybe by using the 'expression' mode, is there a way to set as a function of elevation?

Something like Head=z(node)-1[m]. Where z(node) is the elevation of a node.

2) In case of modeling this river with third BC (Cauchy), do I have to select two 'rows' of nodes, as shown in the attached picture?, and why the units of Cauchy's formula are given in [m]?

Thanks in advance!
• ### Re: Making 'stages' in FEFLOW

Thank you Peter!

Kind regards. ;)
• ### Making 'stages' in FEFLOW

Hello,

Simple question here:

I'm modeling the inflow into a tunnel construction. The model is simple, only water flow under saturated, steady-state conditions.

Is there a way in FEFLOW to model 2 (two) cases, inside the same file?. The first case would be the region considered without tunnels and the second, with tunnels excavated (by de-activating elements of the tunnels and setting 'seepage-face' BC).

Is is possible (how if so), or I'm forced to do two cases in separated files?

Thanks so much in advance. :)
• ### Re: .STL file supermesh and meshing

Thanks Peter!

Now I'm completely clear on this,

Best regards and have a nice weekend!
• ### Re: .STL file supermesh and meshing

I've just tried by adding some points in the interface, and declare these points as 'Points-add-ins' and then grouping by name.

This is quite cool solution, but I would have to import hundreds of points per interface, according chosen Super-mesh.

Is there a different way, dear Peter?

Thanks!