# In this subsection we declare the physical data
# The initial and final time, and the Reynolds number
set initial_time = 0.
- set final_time = 10.
+ set final_time = 25.
set Reynolds = 100
end
end
#The output frequency
- set output = 5
+ set output = 50
#Finally we set the verbosity level
set verbose = false
@endverbatim
-Since the <code>verbose</code> parameter is set to <code>false</code>, we do not get any kind of output.
+Since the <code>verbose</code> parameter is set to <code>false</code>,
+we do not get any kind of output besides the number of the time step
+the program is currently working on.
If we we were to set it to <code>true</code> we would get information on what the program is doing and
how many steps each iterative process had to make to converge, etc.
-A plot of the obtained results for $t=0,1,3,5,8,10$ is the following
+Let us plot the obtained results for $t=1,5,12,20,25$ (i.e. time steps
+200, 1000, 2400, 4000, and 5000), where in the left column we show the
+vorticity and in the right the velocity field:
+
+<table>
+ <tr>
+ <td> @image html step-35.Re_100.vorticity.0.png </td>
+ <td> @image html step-35.Re_100.velocity.0.png </td>
+ </tr>
+ <tr>
+ <td> @image html step-35.Re_100.vorticity.1.png </td>
+ <td> @image html step-35.Re_100.velocity.1.png </td>
+ </tr>
+ <tr>
+ <td> @image html step-35.Re_100.vorticity.2.png </td>
+ <td> @image html step-35.Re_100.velocity.2.png </td>
+ </tr>
+ <tr>
+ <td> @image html step-35.Re_100.vorticity.3.png </td>
+ <td> @image html step-35.Re_100.velocity.3.png </td>
+ </tr>
+ <tr>
+ <td> @image html step-35.Re_100.vorticity.4.png </td>
+ <td> @image html step-35.Re_100.velocity.4.png </td>
+ </tr>
+</table>
+
+The images show nicely the development and extension of a vortex chain
+behind the obstacles, with the sign of the vorticity indicating
+whether this is a left or right turning vortex.
-@image html Re100t0.png
-@image html Re100t1.png
-@image html Re100t3.png
-@image html Re100t5.png
-@image html Re100t8.png
-@image html Re100t10.png
-
-The contour lines correspond to the pressure, the color to the voriticity and the arrows to the velocity.
-Here we only show a zoom into a region near the obstacle which is, after all, where the interesting things happen.
<a name="Re500"></a>
<h2> Re = 500 </h2>