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3D simulation blowing up

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Old   November 17, 2019, 05:37
Default 3D simulation blowing up
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Dear all,

I am working on a project for three phase flow in a bubble column with overlying oil layer.

Using multiphaseEulerFoam, I first validated the equations in 2D (of6).
Now, I want to switch over to 3D. I created a "fine" (800k cells) and "very fine" (+-2M cells) mesh in salome. The timestep is set at 5e-7, maxCo is 0.5.

The problem I am experiencing is that, using the "very fine" mesh, the timestep rapidly decreases towards e-30 (for an adjustable timestep) or the simulation stops after about 40 iterations (for fixed timestep). Similar issues are found for the "fine" mesh, but a larger amount of iterations is achieved.
From the results, I can see that the pressure blows up.

Since I am a relatively new user, I have no clue what could be the reason for this sudden pressure increase.
Did anyone experience similar issues, or can someone give me advice on how to resolve this problem?

Thank you!

Last edited by chengineer; November 18, 2019 at 10:34.
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blowing up, bubble column, pressure

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