Björn Kaiser

That's purely related with numerics. Pyhsically, K values of 0 m/s means no flow. The only way to represent no flow is to deactivate elements. In a physical context, the deactivation of elements and K values of 0 m/s is the same. From the internal computation point of view it's different.

If you impose Dirichlet Boundary Conditions (fixed heads or seepage faces) you can use the corresponding nodes for budget calculation. Use the Rate / Period Budget panels or the Budget History Charts.

The Subdomain Boundary Rate / Period Budget panels only work if the excavated area is not represented by inactive or deleted elements.

Thanks Peter. I fully agree.

Dear razipv,

Unfortunately, I cannot provide a detailed step-by-step manual. Instead, I can provide an answer to your specific question. If you are interested in a detailed step-by-step manual, I suggest a training course.

We will start our online training course sessions soon. For me it seems that [b]Module E: Introduction to density-driven flow for mining applications[/b] could address your interest. You may find further information on the training flyer:

https://www.dhigroup.com/upload/publications/course-calendar/DE_2018_CourseDescription_Thematic_FEFLOW_OnlineCourses_UK_B.pdf?_ga=2.31410687.1120057999.1534764576-697283644.1523874356

Thanks,
Björn

I am sorry. I think I did not fully understand your question. You may find a description of the density ratio here: http://www.feflow.info/html/help71/feflow/mainpage.htm#t=09_Parameters%2FMaterial_Properties%2Fflow_parameters.html%3Frhhlterm%3Ddensity%2520ratio%26rhsyns%3D%2520. If this does not answer your question, please provide more details.

You need to address the nodes of the first slice. Under the assumption that the head located at Slice 1 represents the water level you may implement the attached schematic expression in your more complex expression. Please also note the units in the Expression Editor.

In the Data panel, please right-click on Fluid flow just below Boundary Conditions (BC) and choose Add Parameter from the context menu. Finally, choose Hydraulic-head BC (Saltwater).

Yes, the mass imbalance in the Rate / Period panels is the way to assess the imbalance in the mass budget. In contrast, the fluid imbalance in the Rate / Period panels is the way to assess the imbalance in the fluid budget.

Perhaps the following discussion may help you to reduce the imbalance: http://forum.mikepoweredbydhi.com/index.php?topic=2263.msg5246#msg5246

There are no updates related with the VTK/VTU-writer. Accordingly, I suggest to write a FEFLOW plugin in C/C++ or to write a Python script. The file format description is quite complete:

https://www.vtk.org/wp-content/uploads/2015/04/file-formats.pdf

If you want to visualize water levels I suggest to write the pressure in the vtk-file. You may retrieve the pressure from the FEFLOW API. Here is an example in Python which shows you how to retrieve the pressure.
[font=courier][color=blue]
for node in range(0, doc.getNumberOfNodes()):
print doc.getResultsFlowPressureValue(node)
[/color]
[/font]
In Paraview, apply the contour filter (https://www.paraview.org/Wiki/Beginning_Filters#Contour_filter) with a value of 0 kPa on the pressure array.

You need to generate a finite element mesh composed of tetrahedral elements. The geological model in LeapFrog is not finite element mesh. Instead, it is a geological model. Triangulated surfaces in 3D space may represent external boundaries and internal boundaries as such as geological interfaces or faults.

An overview about the generator properties is provided here: http://www.feflow.info/html/help71/feflow/mainpage.htm#t=07_MeshGeneration%2F3D_Meshing%2Ftetgen.html

Could you please provide the mathematical dependencies by means of an equation? If the math you are interested in is clear for me, I may assist you with a workflow.