Hello everyone,Abaqus 

I'm currently working with an Abaqus Standard 3D (version 2022) model where I need to output the surface normal velocity (VN) for nodes associated with a specific element-based surface for a SSD step. I attempted to request this output using the *NODE OUTPUT command with a SURFACE parameter as mentioned in the abaqus manual here: but I encountered an error stating "unknown parameter surface".

Here is the snippet of my input file where I defined the surface and requested the output:
*Surface, NAME = str_acou, TYPE = ELEMENT
_str_acou_SNEG, SNEG
_str_acou_SPOS, SPOS

**Both  _str_acou_SNEG and _str_acou_SPOS are element sets

*Output, field, frequency=1
*NODE OUTPUT, SURFACE = str_acou
VN

Could anyone help clarify the correct approach to specify node output for an element-based surface in Abaqus?

Thank you in advance for your assistance!