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There's no real satisfying solution for upressing something like a droplet. The suction fluid tool might help direct the high res simulation to match the low res. However it tends to behave like an elastic band if the hi res deviates too much from the low res. Adding drag to match the low res velocity might also help. Both of these approaches can get the high res closer to matching the low res but it will require a lot of parameter tuning. Because of this, we only encourage upressing using container boundaries.
Can you post the hip file?
Assuming your geometry is wired into the anti-gravity properly, the particles should remain inside the geo unless the suction force is too strong and unstable or there are other forces acting on the particles.
It is normal for the particles to fill up the inside volume of the mesh first. Once the inside volume is full, the particles will create a layer outside the mesh depending on the “outside distance” value. It is possible to change this but it would require modifying the VEX code. What type of look are you trying to achieve?
You might find that your particles remain inside the mesh after turning the suction force off if the anti-gravity is still active. You will need to turn the suction strength and anti-gravity strength to zero for the particles inside the mesh to fall properly.
I hope this helps!