pond depth
Dear friends,
I have no experience with CFX. I need to simulate the hydrodynamics of stabilization ponds. I am encountering difficulties in defining the water depth in the pond. At the beginning of the simulation the pond must already have some depth of water. How do I do that? Thanks |
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you should make some expressions to define volume of water and volume of air through initialisation.
1- define an expression for initial water level, say: InitWatLevel = 2[m] 2- make a step function defining water volume: WatVol = step((InitWatLevel - z)/1[m]) 3- make a step function defining air volume: AirVol = 1 - WatVol 4- use WatVol and AirVol expressions in Domain/Initialisation to define volume fraction of each fluid good luck ps. check Tutorial 7: Free Surface Flow Over a Bump |
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The height of the pond should be controlled by outlet weir. Try to find the outlet weir elevation and do a simple math.
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+ pond depth
Thanks for the reply.
The pond consists of one inlet pipe and one outlet pipe. The output may be in a position below the inlet. As inlet condition, I'm defining the normal speed. In the pond the conditions are similar as in the manual: h = 2 [m] initialVOFAir step = ((z - h) / 1 [m]) initialVOFWater = 1 - initialVOFAir initialP = 998 [kg m ^ -3] * g * (h-z) * initialVOFWater As outlet condition, we adopted the normal speed (which equals the speed of entry). What is the error that is being committed? |
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btw the equation initialVOFAir = step((z - h) / 1 [m]) you forgot to define the air pressure in the pressure initialisation PS if you have multiphase leave one phase volume fraction initialisation as automatic. |
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For designing optimization purpose, you may also consider a worst case scenario water level and use it as your modeling base |
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