DEAR ALL,
i am simulate a rectangular open channel with vegetated area inside the domain. (Ansys Fluent)
Depth of water is 0.045 m
total depth of channel is 0.1 m
air is also inside the channel
Velocity at inlet is 0.465 m/s
can anyone tell me how i can calculate gauge pressure in outlet BC and set operating pressure in cell zone condition??
p=rho*g*h*alpha. if h>0.045, alpha=0, else, alpha=1. alpha=1 means it is water phase
Dear Fakhar Abbas
The setting of outlet pressure depends on the operating pressure that you set in FLUENT and in real field. Firstly, you have to think about how much total pressure (operating pressure + gauge pressure) at the outlet of your computational domain in practice.
Let say you have total pressure of 101325 Pa at the outlet of the domain in practice. Therefore, if you set operating pressure 101325 Pa in FLUENT, then you can set the outlet pressure zero. It means that you are working in atmosphere. If you set operating pressure zero, you can set outlet pressure 101325 Pa. It means that you are working in zero pressure environment. Thus, you have to think about operating pressure and the outlet pressure at the same time to obtain the same condition as practice.
Here please note that for incompressible fluids (e.g water), FLUENT does not use total pressure. It uses gauge pressure in calculation and the results are also shown in gauge pressure values. The results (gauge pressure values) depend on how much you set at the outlet. However, it will show the same total pressure at outlet whatever you choose from two conditions that I mentioned above.
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