Are you using coupled scheme for P-V coupling?
This is what the user's guide says for Porous Jump BC: "If convergence instability is observed using the coupled pressure-based solver, it is recommended that you change the pressure-velocity coupling to one of the segregated schemes."
For more information, refer to this section of the user's guide: 7.4. Boundary Conditions (ansys.com)
If you are not able to access the link, please refer to this forum discussion: Using Help with links (ansys.com)
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