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September 2, 2019, 10:21 |
An old story... the p_rgh field
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Super Moderator
Tobias Holzmann
Join Date: Oct 2010
Location: Tussenhausen
Posts: 2,708
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Hi everybody,
even though people might think I am good in FOAM, I am having still problems with the p_rgh field and boundary conditions. Well in the numerical point of view it is not a big deal to get the idea of the p_rgh field and even the derivation of the equation. However, letīs talk about that (again) using a relatively simple case. Referring to the attached PDF, we see two tanks (1) and (2) filled with water while on both tanks an atmospheric pressure is given above the fluid level. The filling level difference is given by represents the level difference. Each tank has a pipe to the storage tank shown in the middle of the draft. The area of interest is given in the right bottom corner. Letīs imagine infinite large tanks (1) and (2) which means that the water level does not change during time. Thus, we always have a defined (and fixed) hydrostatic pressure that acts as a driving force for the water (1) and water (2) to flow into the storage tank (3). Let's assume that tank (1) has 30 degC warm water and tank (2) has 45 degC warm water. We take a defined mass flow out of tank (3) while new water is sucked in from tank (1) and tank (2). The ratio depends on the hydrostatic pressures of both streams. Means, if increases (higher water level in the tank (2)), more water from the tank (2) is flowing into tank (3). As in all p_rgh cases, I am struggling with the correct pressure boundary conditions. Questions
Did anybody had similar set-upīs before and can help me out? I was looking into the hydrostatic* pressure boundary conditions but did not find any suitable one for my case. Any hints are welcomed. Thank you in advance Tobi
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Keep foaming, Tobias Holzmann |
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