Unpack the file by using the following command:

tar -xvozf demo_sep2005.tgz
(out)demo.bnd
(out)demo.cel
(out)demo.cfg
(out)demo.din
(out)demo.net
(out)demo.vrt

You will see the following files:

Create a geometry file using the preprocessor and the following inputs:

preprocessor
(out)Dolfyn PreProcessor
(out)Input casename:
demo
(out)Using demo as input
(out)Opening demo.dbg
(out)File demo.dbg opened
(out)Opening vertex file
(out)Opening demo.vrt
(out)File demo.vrt opened
(out)Initialise vertex list
(out).
(out).
(out).
(out)Setting up boundary list: 2140
(out)Total number of boundaries: 4140
(out)Default boundaries: 2000
(out)Assigned boundaries: 2140
(out)Done reading geometry
(out)Minimum distance to a wall: 2.4999976E-02
(out)Maximum distance to a wall: 0.1000004
(out)Minimum wall angle (degs) : 0.0000000E+00
(out)Maximum wall angle (degs) : 0.0000000E+00
(out)Enter scaling factor (1.0):
1.0
(out)Using: 1.000000
(out)Enter format of geometry file (bin|ascii):
bin
(out)Dump geometry file
(out)Opening demo.geo
(out)File demo.geo opened

Optionally, the input file demo.din may be edited, for example with nedit:

nedit demo.din &

Now start dolfyn and select the demo case:

dolfyn
This is dolfyn version 0.300
Copyright(C) 2002-2005 Cyclone Fluid Dynamics BV
NL-5583 XM, Waalre, The Netherlands
Enter case:
demo
Using case: demo
demo.geo binary
Opening geometry file
*** Warning: Geometry file of version: 0.200
Maximum region number found: 6
Geometry checks
Angles: 0.0000000E+00 0.0000000E+00 0
End reading geometry
Boundary 1 inlet conditions
Boundary 2 outlet conditions
Boundary 3 sym. conditions
Boundary 4 wall conditions
Boundary 5 sym. conditions
Boundary 6 wall conditions
Boundary 4 sym. conditions
Boundary 6 sym. conditions
Boundary 0 sym. conditions
End of input deck


-------------------------------------------------------
Case : demo
Title : Demo test run
Date and time : 09/26/2005 (15:25)
Number of cells : 1000
Number of vertices : 2146
Number of boundaries : 2140
Number of faces : 4070
Number of regions : 6
-------------------------------------------------------
Number of iterations : 200
Steady state run
Target residual tol. : 2.000E-06
Monitor cell : 1
Pressure ref. cell : 1
Reference pressure : 0.000E+00 Pa
Reference density : 1.200E+00 kg/m3
Molecular viscosity : 1.000E-04 Pa s
Gravity vector : 0.000E+00 0.000E+00 0.000E+00
-------------------------------------------------------
V SCV gamma urf rtol guess
U: TTF 5.000E-01 7.000E-01 1.000E-01 1.000E+00
V: TTF 5.000E-01 7.000E-01 1.000E-01 0.000E+00
W: FTF 5.000E-01 7.000E-01 1.000E-01 0.000E+00
P: TTF 0.000E+00 2.000E-01 5.000E-02 0.000E+00
k: TTF 0.000E+00 5.000E-01 1.000E-01 0.000E+00
e: TTF 0.000E+00 5.000E-01 1.000E-01 0.000E+00
T: FTF 0.000E+00 5.000E-01 1.000E-01 2.930E+02
S: FTF 0.000E+00 5.000E-01 1.000E-01 0.000E+00

.
.
.
Go!

1: 2.50E-06 7.09E-09 0.00E+00 1.58E-06 ...
2: 2.48E-06 3.15E-08 0.00E+00 1.56E-06 ...
3: 2.47E-06 2.40E-08 0.00E+00 1.53E-06 ...
.
.
.
Done

The results are stored in demo.odx.

Finally start OpenDX to inspect the results (load demo.net in OpenDX):

dx&