[mfinke]

Dear community members,

i working on a "displacement pump" model. The Fluid is defined as 1 phase compressibel flow (roh = f(p)) and a turbulence model is used.

Inlet and Outlet is defined as opening with pressure boundary condition with the nonreflective beta feature activated.

There are several GGIs defined to connect different parts of the pump (e.g. pistons with control journal).

Its a transient simulation with moving mesh regions.

I´m using initial condtions from earlier simulation with reflective B.C. but large time step where the pressure wave propagation has no influence on flow behaviour.

Problem:
due to the constant pressure boundary conditions i have numeric pressure wave reflections at the Inlet and Outlet and later on propagation of this waves.

Therefore I´m trying to use the nonreflective boundary condtion option in CFX-Pre but in the first Iteration i get the following error message:

"ERROR #001100279 has occurred in subroutine ErrAction.
Message:Signal caught: Segmentation violation"

"ERROR #001100279 has occurred in subroutine ErrAction.
Message: Stopped in routine SIG_HANDLER:"

any idea ?
Is there some limitation of this beta feature ?
I only know that nonreflective B.C. don´t works together with multiphase flows.

best regards and thank you in advance

Matthias