adv5_no_dtime
Summary: Stability in transient analyses with a flowrate specified at the exit of the model.
Flag:
Adv5_no_dtime 0
This flag is off by default (value of 0). Changing the Value to 1 enables the flag.
Description
In some transient long running analyses unstable results have been observed at the inlet. The instability typically occurs when a flow rate is defined at the outlet. If this instability is observed at the inlet of a transient using ADV5 (typical setup for a pump), this flag is recommended. The flag modifies the stabilization algorithm regarding advection and diffusion.
The following turbulence models may have limited affects from the flag:
- SST-SAS
- SST-DES
Note: Avoid the turbulence models mentioned if the behavior is observed. Change the turbulence model to SST k-omega and turning on the flag.