This tutorial was copied from /home/felix/Dokumente/Aktuelles_U/19_03_27_DumuxTag/dumux/dumux/test/porousmediumflow/tracer/1ptracer.
This tutorial was copied from dumux/test/porousmediumflow/tracer/1ptracer.
# One-phase flow with with random permeability distribution (and a tracer model)
## Problem set-up
This example combines a stationary One-phase flow in a porous medium with randomly generated permeabilities with a tracer model. In the first step, the groundwater-velocity is evaluated under stationary conditions. Based on the velocity field the tracer model is running instationary.
A contaminant tracer is diluted by diffusion and a base groundwater flow from the bottom to the top. The permeability within the domain is randomly distributed.
## Random permeability generation
### main file
This example combines a stationary One-phase flow problem with a tracer model. In the first step, the groundwater-velocity is evaluated under stationary conditions. Based on the volume fluxes, the tracer model is solved instationary. Therefore both, the problem_1p.hh and the problem_tracer.hh have to be included in the main file.
```C++
#include "problem_1p.hh"
#include "problem_tracer.hh"
```
In lines 83-192, the stationary 1p problem is setup and soved and the volume fluxes are calculated for the tracer problem.
In lines 193-292, the tracer problem is set up on the same grid and solved instationary.
## 1p problem
### problem_1p.hh
??
### spatialparams_1p.hh
#### Random permeability generation
The follwing code can be found in lines 64-72.
```C++
...
...
@@ -25,4 +38,8 @@ Two lognormal distributions are defined: K and KLens with different means and st
Within a loop through all elements the randomly generated permeabilities are assigned according to their position in the domain (inside or outside the lense).
## Tracer model
...
\ No newline at end of file
### problem_tracer.hh
The molar mass of the component and the binary diffusion coefficient can modified in lines 117-128.
### spatialparams_tracer.hh
The density, the molar mass of the fluid as well as the prosity and dispersivity can be adapted in the lines 63-93.
