LSDYNA has more capabilities in modeling direct human skull with Brain (SUFEHM) You can also do via THUMS and collect the injury HIC variables along with the pressure inside the brain.
i have implemented two methods, Lagrangian,SPH i have used SPH as it was tailored to address Fluid structure interactions and you can expect large deformations as well( as the formulation will allow for it)
my probe locations are as follows
my results of pressure using the pressure as expression are as follows you can reduce the particle size for further refinement you can tune the curves.
1)ALE is also suits for these simulations involving the fluids interactions.
2) perhaps, your material model is not good enough, try with inbuilt materials (WATER, WATER2, WATER3) in explicit dynamics library
3) LSDYNA does a good job as alternative to explicit dynamics.
4)you don't need such elements but you can explore.
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