Reply To: Specifying the pressure at pressure outlet boundary in multiphase flow

[kim08wexler]

Hi,

Yes, for a multiphase VOF model, setting the operating density to zero is a good way to include the hydrostatic pressure effect explicitly in your simulation. By default, FLUENT uses the minimum phase-averaged density as the operating density, which may not fully capture the hydrostatic pressure variation, especially in cases involving significant height differences or where gravity-driven flow is important.

By setting the operating density to zero, you ensure that the gravitational force is applied directly to each phase according to its actual density, which should better represent the hydrostatic pressure distribution in your multiphase flow.

Good luck with your modeling!