Environmental Engineering Reference
In-Depth Information
Fig. 4
Isovorticity surfaces of the spanwise vortex in a periodically forced flow at
a
t
=
15 s
b
t
=
20 s and
c
t
=
40 s
4 Time Convergence
Figure
5
shows the maximal Courant number (maximal over all the mesh) as a func-
tion of time for the cases studied here. Figure
5
a exhibits themaximal Courant number
in the pulsating flow. The curve never exceeds the value of 0.3, then the time conver-
gence is always guaranteed over all time integration. For the periodic forcing flow
(
S
02) the curve has a maximal value of approximately 0.7 (see Fig.
5
b). Again,
the maximal Courant number is less than 1, that is, time convergence is guaranteed
for the periodic forcing flow.
=
0
.
(a)
(b)
Fig. 5
Courant number in some of three coordinates.
a
The pulse case.
b
Theperiodicflowrate
case
Search WWH ::
Custom Search