Denim Umeshkumar Anajwala

Tunnels can be simulated by seepage boundary conditions, discrete feature elemens or high-conductive zones, depending on the purpose of the model.
Fractures are typically simulated by using discrete feature elements.

The most likely reason is that parts of the line are outside the supermesh polygons.

Have you set the new parametric relationship for all elements (Assign - global -  VG modified - model)? Just switching to VG modified does not yet change the parametric relationship used for the model!

I'm trying to control the size of the file I get when exporting particle tracks. I've been playing with the settings in the Numerical Parameters dialog box, namely "Minimal time between saved pathline points [d]", but I'm not sure I fully understand how that works; esp. in combination with "Minimal Stepsize Factor". Can anyone shed some light?

I also noticed a new option in mentioned dialog box: "Pathline Data Point Compression". Does anyone happen to know how that works?

Thanks, Chris

We are currently discussing different options for that. We will definitely come up with a solution, but we currently do not know when this will be as there are both technical and administrative requirements that have to be fulfilled.

There are two reasons:
1. The very limited number of people who would use such a documentation does not justify the required effort.
2. A documented format needs more effort to maintain, as internal changes are less easy to perform.

There are also extensions for ArcGIS to divide lines into points with a fixed distance. The elevations could then be derived by a spatial join. This could avoid the TIN, wich might require a 3D Analyst / Spatial Analyst license.

Here is just a quick initial idea for further discussion: What about a transfer boundary condition for heat transport with a reference temperature equivalent to the air temperature and a transfer rate corresponding to the heat conductivity divided by the thickness of the dry layer (if it is not modelled)?

At the moment, such a simulation is possible by fully discretizing the vertical loops in the mesh, giving the different parts different conductivities. With FEFLOW 5.4, coming at the end of this year, we will come up with a new method using vertical one-dimensional elements for calculating borehole heat exchangers.