RESULTS AND DISCUSSION

Note : some iteration number are wrong in certain graph,
because I loaded data from saved post file, and I think that Iteration
number is not part of the post file (.pst),

but part of the model file (.mdl).

__FIRST RESULTS :__

We first present the results obtain **without** MARS
scheme.

Mach Number :

Density :

Pressure :

Velocity (horizontal component) :

The two last graphs allow us to say that Star CD captur a slip lign (see above in the MARS results).

Total temperature :

We present this last graph because physically, the total
temperature has to be constant (for us 526.9 K), whereas in our calculation,
it is not...

__MARS RESULTS :__

We now present the results obtained
with a restart on previous results as initialisation, and in choosing MARS
scheme for the velocity components and the density, and also in forcing
the total temperature to be constant (in the **thermal models** (thermophysical
model and properties, liquids and gases) panel, click **display options**
and choose **Stagnation enthalpy **in the **conservation **pop-up,
and write the total temperature to force in the corresponding box).

First, let us show to you the total temperature... :

...Which is nearly constant !

Mach Number :

Density :

Velocity (horizontal component) :

The two above graphs prove us that Star CD has captured the slip lign, because there is a speed discontinuity, whereas the pressure is constant at this place (y=0.9, 1.25<x<2.25).

To precise this phenomenon, we plotted the pressure and the velocity profile for x=1.5 :

In blue : the pressure

In green: the velocity magnitude

We can notice that the slip lign is locate as approximately y=0.9, which the symmetric location of the step.

We can also plot the velocity vector in the section x=1.5
:

I present also the Mach profile along the bottom boundary.

This graph is a little bit difficult to interprate, but we show it as an example of Graph plotting with Star CD.