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In the coupled simulation of OpenFOAM and LIGGGHTS, the pressure turns negative.

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Old   November 8, 2023, 05:00
Default In the coupled simulation of OpenFOAM and LIGGGHTS, the pressure turns negative.
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Hello, researchers.

As shown in the attached figure, the model has a velocity inlet on the left, and there are multiple pressure outlets on the upper and lower sides of the pipe, with outlet pressures set to 0.
The particles move from left to right, and when they become blocked in front of the second and third outlets on the lower side, the pressure from the blockage to the outlet segment becomes negative. What could be causing this? Furthermore, even though the particles are blocking these two pipe outlets, the outlet flow velocity remains unchanged. This is completely inconsistent with my expectation that the outlet flow velocity should decrease. What can be done to address this issue?

Thank you for your assistance.
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liggghts, openfoam

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