Class 3 Error

Some cases which use a mass-flow specified outlet with the "Shift Pressure" option for the "Mass Flow Update" setting result in a mass flow which does not match what the user has set. This only affects cases which are run in parallel and where artificial walls are built at the outlet (to prevent fluid from flowing into the domain).

When the "Shift Pressure" option is used, the algorithm which calculates the appropriate pressure shift needs to iterate to determine the pressure shift when artificial walls are present. In parallel, a coding error means that the iteration never happens and the pressure shift is not updated properly

No workaround is currently available. The user may be able to avoid the problem by modifying the initial conditions and/or boundary condition settings so that artificial walls are not built at convergence or during the process of reaching convergence.

ANSYS CFX Release 12.0. A custom executable for ANSYS CFX 11.0 SP1 is available on request.

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