Version: 2.0beta2
Authors: E. Moreau
Case  Download  ID  Parameters 

KEPSILON  09141027  IDEUCH=1 IDTVAR=1 

09111415  IDEUCH=2 IDTVAR=1 

09141727  IDEUCH=1 IDTVAR=2 

KOMEGA  09141121  IDEUCH=2 IDTVAR=1 

09141426  IDEUCH=1 IDTVAR=1 

V2F  09141730  IDEUCH=1 IDTVAR=1 

09141737  IDEUCH=1 IDTVAR=1 

09161549  IDEUCH=1 IDTVAR=1 no interface 
Colour  Boundary 

3  Cold wall, %$T=15.6$% 
1  Hot wall, %$T=54.7$% 
2 or 4  Adiabatic wall, %$\frac{\partial T}{\partial n}=0$% 
5  Symmetry 
Simulations consisted in comparing three kinds of turbulent models and the effects of the wall function parameter (ideuch) in the models.
Seven simulations have thus been performed in this study : three calculations with the %$k\varepsilon$% model ( IDEUCH
= 1 or 2), with a time step varying with time ( IDTVAR
= 1), and with a time and spatial dependent time step ( IDTVAR
= 2). Two calculations with the %$k\omega$% SST model ( IDEUCH
= 1 or 2), with IDTVAR
= 1. And two calculations with the %$\varphi\overline{f}$% model, the first one with IDTVAR
= 1, and the second one with IDTVAR
= 1 (stationary).
The first main result is that the simulations performed with the version 2.0 give very similar results with the previous validated version 1.3. This fact is verified for the three models used, and the conclusions obtained with the version 1.3 could be rewritten here for the version 2.0.
The results are presented in the following figures (1) to (15).
All figures except figure (5) give the temperature and velocity profiles at z = 0 and at several levels y of the domain.
The overall results show that the %$\varphi\overline{f}$% model and the %$k\omega$% SST model give results very close to the experience. More precisely:
IDEUCH
= 1 while the results are better for the velocity with IDEUCH
= 2.
IDTVAR
set to 2 (time and space dependent time step) improves these results (temperature and velocity). The case has been used with the time step limitation linked to the local thermal time step ( IPTLRO
option).
IDEUCH
= 1 gives results very close to experimental data (better than IDEUCH
= 2) for the temperatures and velocities.
Figure (5) shows vertical profiles of velocity and temperature starting from the middle of the upper and lower wall (at z = 0 and x = 0.038m) and extending on 0.04m towards the cavity center. We find again a good agreement between %$k\omega$% SST or %$\varphi\overline{f}$% models and experience for the velocity. On the other hand, none of the models used give correct profile near the wall since we have considered completely adiabatic walls. Version 1.3 yields the same conclusion.
It should be pointed out that a simulation without using the xml
file have been performed (we have used only the fortrans files) for the %$\varphi\overline{v^2}$% model ( IDEUCH
=1), the same results are obtained whether the intereface is used or not (figures (14) and (15)).
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