Comparison between steady and unsteady option

for different profiles of velocity, temperature and pressure

x-velocity profile x=0.005
 
 
steady
unsteady

x-velocity profile x=0.015
 
 
steady
unsteady

These comparison on x-velocity for x=0.005 and x=0.01 show us that the absolute value of the x-velocity is the same in the two cases. However, one can notice that the two curve are opposite, refered to the x=0 axe. This is due to the contrary rotative direction of the rolls, phenomenon explained in the previous part.

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Temperature x=0.005
 
 
steady
unsteady

 

Temperature x=0.01
 
 
steady
unsteady

These results show us two things:
- on the one hand, the x=0.005 profiles show us that the temperature is the same for the steady and the unsteady simulation. This tend to confirm the results given by the x- velocity  profile: results given by the steady and the unsteady simulations are the same
- on the other hand,, we can see that the evolution of temperature on x=0.01 axe is different. This is due to the contrary rotative direction of the rolls

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Dynamic pressure x=0.005
 
 
steady
unsteady

 
 

Dynamic pressure x=0.01
 
 
steady
unsteady

These tests have been done only to confirm the fact that steady and unsteady simulations give the same results. At the contrary of the temperature,

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Comparison


Temperature x=0.005 and x=0.015
 
 
steady
unsteady

 
 

Dynamic pressure x=0.005 and x=0.015
 
 
steady
unsteady

The goal of these graphics is to see if the axe x=0.01, which is a symmetric axe for the geometrie of our domain, is a symmetric axe for the dynamic pressure and temperature fields. One can see that the temperature and pressure fields are identical on x=0.005 and x=0.01 axes for the steady simulation. For the unsteady simulation, there are little differences, but there negligeable. So this results tend to show that in the two cases (steady and unsteady),  the symmetric axe for the geometrie is a symmetric axe for the fields which caracterize the flow.

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