[elta_gw]

Hi,

can somebody please explain me (in detail) the difference between two boundary conditions by ANSYS POLYFLOW:

1. Outlet (fn, vs = 0)
2. Zero Force (fn, fs = 0)

I trying to simulate extrusion process with free surface and viscoelastic material, and asking me about the right boundary condition @ outlet (end of the free surface).

Some references (f.e. Prof. Kostic, Uni Illinous) use for extrusion the first one, other (Uni Aachen) - the second one (comparable models etc). My experience show high (wrong) deformation using the first one. At the same time advices ANSYS POLYFLOW via Users Guide (Cap. 8.10) this BC for viscoelastic flows.

Need your help!

Thank you in advance!