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September 18, 2023 at 5:34 am
walaakm10
SubscriberHello,ÂÂI need help to understand the physical meaning of this graph, where there is a mistake that I can't get. I am simulating a flood, my inlet boundary condition is a velocity inlet (transient table). I am simulating 15 minutes of flood.ÂÂThe velocity is increasing in the boundary condition, so logically, the VOF should be growing as well. Eventually, the water should fill the whole space.ÂHowever, when the VOF reached 0.6, at a time of almost 5 minutes (300 sec), it stopped growing and kept almost constant, although, the velocity in the boundary condition table kept growing.ÂÂCould anyone help to understand where is the problem? -
September 18, 2023 at 3:35 pm
Rob
Forum ModeratorPlease post some images of the flow field. How did you define the report?
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September 19, 2023 at 5:54 am
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September 19, 2023 at 5:55 am
walaakm10
SubscriberAre these screenshots clear? do you need other information?Â
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September 20, 2023 at 2:10 pm
Rob
Forum ModeratorHow does the air escape?Â
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September 21, 2023 at 4:15 am
walaakm10
SubscriberI am defining the whole ceiling as a pressure outlet, is this enough? I am not defining any vents.ÂÂAdditional note:ÂI made another try to examine if there was a problem in the transient table, I redefined the velocity inlet to a fixed value, however, the same exact behavior happened, at almost VOF=0.6, and kept almost stable. -
September 21, 2023 at 4:42 am
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September 21, 2023 at 7:50 am
Rob
Forum ModeratorThat should be fine. How is the inlet defined?Â
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September 21, 2023 at 10:22 am
walaakm10
SubscriberI divided the inlet into two parts (velocity inlet and pressure inlet). I don't want the water to enter from the whole door height (occupied the whole height I mean).
The total door height is 1.7 m, and a part of 0.35 m, near the ground, is the water inlet and I defined it as a velocity inlet, the rest of 1.35 m above I defined as a pressure inlet.Â
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September 21, 2023 at 11:08 am
Rob
Forum ModeratorWhat mass flow of water is coming out of the pressure inlet?Â
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September 21, 2023 at 1:14 pm
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September 21, 2023 at 2:11 pm
Rob
Forum ModeratorPlease check the mass flux report on the pressure inlet - specifically for the water phase.Â
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September 21, 2023 at 2:49 pm
walaakm10
SubscriberI am sorry, would you help me with how to check this? I can't find it.Â
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September 21, 2023 at 3:04 pm
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September 21, 2023 at 3:05 pm
Rob
Forum ModeratorResults (tab) > Reports > FluxesÂ
I suspect the water is entering the domain through the inlet, and then overflowing back out of the pressure inlet.Â
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September 21, 2023 at 3:11 pm
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September 21, 2023 at 3:20 pm
Rob
Forum ModeratorYes, you have 384.67kg/s water leaving through the inlet. I suspect that ties up with the inflow.Â
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September 21, 2023 at 4:03 pm
walaakm10
SubscriberI see, thanks for your help. do you have any idea how I can fix this ?
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September 21, 2023 at 4:07 pm
Rob
Forum ModeratorMaybe turn it into a wall?Â
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- The topic ‘Water VOF became fixed per time, although water velocities are increasing’ is closed to new replies.
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