TAGGED: pressure-drop, vacuum-chamber
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June 5, 2024 at 8:45 pmGilles ButikoferSubscriber
Hello there,
I'm having a troubles with my simulation. I want to simulate the behaviour pressure over time of a parallelepiped vessel attached to a vacuum pump (which is just described by a mass flow outlet on the vessel). At the beginning of the experiment, there's 1 atm of air inside the volume.The decrease in pressure I get is way less than what's observed with the experiments and the analytical estimation.
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My simulation is a watertight geometry with only one outlet.I use the Density based solver. The fluid is air from the material fluid list, and I changed "Density" parameter from constant to ideal gas, so density can vary, accordingly to P and T. (I tried other real gasses models as well, and tried many viscous models)
My mesh has a good quality, I kept the number of nodes around 1M beceause it's taking too long otherwise. (even as I'm computing on a Calculator)Transient simulation, time steps of 1e-4 s. The Solution is converging properly, with 20 it/time step at the beginning and then reducing it to 3.
From experimental and analytical pov, we know that we should observe a drop in pressure of about 5800 Pa in the volume after 10 seconds. However, The simulation only gives me a 10 Pa pressure drop. I'm attaching images here : https://www.swisstransfer.com/d/d29e23d6-0a70-48e6-923d-76c0e16e8a54 as i can't attach them down here, idk why.
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July 2, 2024 at 1:32 pmRobForum Moderator
Staff aren't permitted to open files or links so you'l need to post images here.
If you monitor domain mass (volume report) as well as pressure does that make sense?
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- The topic ‘Vacuum chamber – air extraction, from 1 atm to vacuum in a closed geometry’ is closed to new replies.
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