Some simple cases
| A long obsatcle | A
pyramid-shaped obstacle | An inclined
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.
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.
a dam breaking
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.
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.
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 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.