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Non-reflecting boundaries on ANSYS: LS-DYNA

Non-reflecting boundaries on ANSYS: LS-DYNA

Non-reflecting boundaries on ANSYS: LS-DYNA

(OP)
I'm trying to model a large section of soil subjected to impact loads.

Since the soil should behave like an elastic half-space, I need to set some non-reflecting boundary conditions (NRB).

According to the manual, I should select the desired nodes with the NSEL command, creating a component from all those nodes with CM and finally apply the non-reflecting boundaries with EDNB, turning on the Dilatational activation flag and the Shear activation flag.

Input-wise,it comes down to:
NSEL,S,LOC,X,hx !selecting all desired nodes
CM,planox,NODE !creating the component from the nodes
EDNB,ADD,planox,1,1 !adding the non-reflecting boundary to it

However, I'm getting the exact same results with free boundaries, the NRBs aren't changing anything, I still get lots of reflected waves.

I'm using 3dsolid164 elements, with linear-elastic isotropic material.

Has anyone been able to use this boundaries correctly?

If more information about the model is needed do say, I'm just boiling it down to the essentials.

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