Even when correct contact definitions are applied between SPH particles and the impacted surface, non-physical seepage of SPH nodes can still occur at high impact velocities. This issue can often be resolved by adjusting numerical parameters:
Reduce the initial time step scale factor (TSSFAC) in the *CONTROL_TIMESTEP card.
Increase the contact thickness (MST) for the target surface in the *CONTACT card.
These changes help improve contact stability and prevent penetration artifacts commonly seen in high-speed SPH simulations.
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