Some simple cases

Test case | A long obsatcle | A pyramid-shaped obstacle | An inclined profile

This part of the report is consecrated to the different tests we have made during this MCIP. The first one represent a test case we have try to learn the use of JADIM. The three following ones are three different obstacles we have tried to simmulate waves.

• Test case: a dam breaking
This first case is a well known test case which is used to validate codes. The geometry is a simple rectangle of 10m*5m and the initial condition is water put in a rectangle of xm*xm at the entrance of the geometry and everywhere else it is air. Boundary conditions are one inlet at the entrance edge and three walls for other edges. This inlet condition is not nessecary because of the physical problem studied here. In fact we should have also choosen a wall condition for this ecge. As soon as the simmulation start, the water is supposed to fall down and its evolution along the floor is a well known result. This test has already been validated on JADIM. We just have tried to run such case which works to learn the use of JADIM. Results are available in the next part.

The following cases represent different test we have tried to simmulate wave increase because of the presence of an obstacle. We have also tested different ways to generate waves which are not available in thi report. However, those tests were just tries with different approach. The first modelisation of waves we have choosen was to generate, in initial conditions, some water under the air and a little pave of water near the entrance. This little pave of water is supposed to fall like in the dam breaking test, but this time, it falls in water whereas in the other case it fall on the floor. It generate a perturbation at the interface level. We hoped this perurbation to change itself to a wave but it does not work correctly. In fact it generates a hole followed by a perturbation which does not really look like a wave. Therefore We have deciced to refine this water elevation at the begining of the field of study by generating a pyramidal one instead of a rectangular one. We have obtained better results with this initial condition so we have choosen to keep it for the rest of the study. The following cases represent the evolution of this wave we obtained, when it meet an obtacle. The aim was to increase the height of the wave.

• A long obstacle
This first test is based on a simple geometry because the obstacle is a rectangular pave on the edge representing the ground. The generation of the obstacle needs to modify the geometry file of JADIM. The domain of control is xm*xm and the obstacle is xm*xm. The mesh is composed by x elements. And initial conditions are those explain in the previous paragraph. The results we have obtain with this case are available in the next part of the report.

• A pyramid-shaped obstacle
By analysing the results of the previous test we have decided to adapt the geometry of the obstacle to optimise the increase of the wave. Therefore we have created some rectangular pave one upper the other and with a decrease of their lenght to obtain a pyramidal form. This also has needed to change the geometry file. Nevertheless the dimensions of the field of study have not changed. The results we have obtain with this geometry of the obstacle are available in next part of the report.

• An inclined profile
The aim of our study was to test different forms of obstacle to simmulate on the one hand geotextil pave placed on the ground and on the other hand a construction on piles which permit more flexibility in the generation of a sloping obstacle. That's wath we have try to do in that last case. We have generated three pave at different height upper the ground to simmulate this sloping obstacle. Here too, the dimensions of the field of study have not changed. And the results we have obtain are available in the next part of the report.