Editing stress and material parameters in TPV12-13 training example

[yair-franco]

Does the training example for TPV12-13 run TPV13 (Drucker-Prager material properties) by default, and is TPV12 (linear plastic) run by simply omitting the cohesion and bulk friction variables in the material YAML file? Also, are both the stress and the reference vector needed to change the rupture mechanism in this same code to, say, reverse slip? Or are additional changes needed?

[Thomas-Ulrich]

The switch is here https://github.com/SeisSol/Training/blob/main/tpv13/parameters.par#L5 between tpv12 and 13.
reference vector is only an output thing (inverts the dip component in the output, but the simulation remains the same, execpt if the fault tractions are defined as T_s T_d T_n is the yaml file instead of a stress tensor, which is not the case here).
If you want reverse slip you need to adapt the stress.

[yair-franco]

What stress relationships are used to derive the appropriate stress parameters for this simulation? That is, if I want to simulate an identical fault rupture but with reverse slip instead, or different friction coefficient, while keeping everything else the same, how is the needed stress tensor calculated?