Multi-layer fixed dummy/ghost particles

Hi

By using DUALSPHYSICS, may I know whether it is possible to have multiple layers of fixed dummy/ghost particles placed inside the solid body (as practised in most of the SPH literatures) in order to ensure full kernel support?

So far, I noticed that DUALSPHYSICS placed only 1 layer of dummy particles on the boundary? The densities of these dummy particles are solved using the continuity equation & the dummy pressure is then devised from the state equation.

Thanks.
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