III.   Without flood case.

    After having created the mesh with Matisse, we modified the cas.ref file to impose the conditions for the flow. We first avoided the complications without taking care of the flood in order to obtain an established result. Then we could consider sending a flood into the model.
The cas.ref file is the place where the boundary conditions and the initial conditions are defined. The initial height is 0.01m. The flow is imposed (10m3/s) for the two entrances and that is the height which is imposed (0.1m) for the exit.
The first result we have visualised (with Rubens) is for 2200 seconds :

The height of water is still very important at the top of the valley even if the most important quantity of water lies in lowest part of it. We can remark that the line of maximum height goes between the two banks of the valley.
Then, after 10000 seconds :

The water continues moving towards the lowest parts of the valley. The water height is now twice more important than it was for the precedent visualisation. The design of the flow of water is quite clear now, it follows the lowest line of the valley. The regime of the flow begins to be established.
For 19200 seconds (5 hours and 20 minutes), we have :

We can now consider that the flow regime is established. The banks of the valley are almost empty of water (only 4 mm of water). The whole quantity of water follows the path we have designed for it, and the height of water is quite constant with the time.
The sending of a flood is now possible with this established regime for the flow.
 

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