Carlos Andres Rivera Villarreyes Global Product Specialist - FEFLOW

Hi Maria,
Everything depends on the license model you have. FEFLOW Professional and Subscription license allows multiple model runs (operations) with the same model (mesh and problem settings). For example, if you operate with the very same FEM file linked to the FePEST project, this should be possible with the licensing options mentioned. Also, any change you do to the FEM problem, this will not be immediately reflected in the FePEST project.

Cheers
Carlos

The density values are implicitly given through the volumetric heat capacity rho_s * c_s. Specific heat capacity has units of J⋅kg[sup]−1[/sup]⋅K[sup]−1[/sup]. The FEFLOW parameter is in J m-3 K-1. The factor is exactly the density (kg/m3).

Cheers
Carlos

DHI will be offering a full FEFLOW training course for modelling open-cast mines. Full details are available in our website:
https://events.dhigroup.com/modelling-open-cast-mining-online-course

Yes, FEFLOW Expression Editor will apply the TS function and expression to all the elements. You can easily create IF -THEN statements for cases, where you need to restrict this operation.
The recent FEFLOW versions supports the use of Python function to a set of material properties. You can store a Python function in the Scripting menu in the FEFLOW 7.5 GUI. After right-clicking In/Out flow on/top bottom (context menu), you will see the possibility to connect the function with the material.
Definitively, you have a much higher degree of flexibility with Python compared to MATHED methods.

Cheers
Carlos

You can link the parameter source/sink or in/out-flow on top/bottom to a mathematical expression (or Python function). The expression will be evaluated before the time step execution, so you can basically modify anything as you want, e.g. using elemental user distributions with potential recharge factors.
There are different ways to introduce the temporal data in FEFLOW, I will recommend you to take a look on http://www.feflow.info/html/help75/feflow/09_Parameters/Material_Properties/time_varying_materials.html

Cheers, Carlos

Through the FEFLOW installation you are requested to install a new section called "Plugins". Could you please make sure whether this has been activated during installation?
If the problem persists, we will be glad to assist you through the official support channel (mike.de@dhigroup.com)

Cheers, Carlos

We have noticed this problem in the past and was mainly associated to the scaling value given in the Display Settings in Windows 10.

Hi,
Without knowing the model settings, I think the problem can be managed by setting different weights for the observations. You can run FePEST with the NOPT option (Termination Criteria) to estimate one full Jacobian matrix. This can give you some insights about the sensitivities.

Cheers, Carlos

There are two types of equations in FEFLOW: those used for the assignment and those, which will dynamically be evaluated through the model run. In the case of boundary conditions, the expressions are only supported for assignments (before the model run). As soon as you click the buttom "Assign" the expression is evaluated and longer no more.
The second case of dynamic expression is supported for several material propeties. This is an option implemented in one of the latest release. The overview of parameters supported is below:

http://www.feflow.info/html/help74/feflow/09_Parameters/user_defined_equations.html

For your specific question, the easiest manner to control the boundary is via a simple Python function, which can be stored in the FEM file and call it through the run. The Support team (mike.de@dhigroup.com) could give you some hints about the usage.

Cheers
Carlos Rivera

Probably the current FePEST is missing some results. Typically, you will require to have a Jacobian matrix (*.jco file) computed from an Estimation run.

Regards, Carlos Rivera