Gamma Theta Model Error

dl467 · November 24, 2015, 15:06

Hi, I am attempting to capture the transition around a Low Pressure Turbine using the SST Gamma Theta Model. SST on its own works fine, but once I add in the Gamma Theta Model I get an error:
Error detected by routine PSHDIR
CDRNAM=/FLOW/PHYSICS/ZN1/FL1/TURBM/TRANSITION/RETRNONS/TFC/SIGMA
CRESLT = NONE
Could you please help me understand what might have gone wrong?

ghorrocks · November 24, 2015, 18:30

There is probably a necessary parameter you have not defined. Maybe you have not defined the Gamma-theta conditions at a boundary condition? Or an initial condition?

dl467 · November 24, 2015, 19:57

My understanding is after reading the CFX-Modelling Guide, that I don't need to define anything extra at the boundary or an initial condition.

ghorrocks · November 24, 2015, 20:04

You appear to be correct.

Regardless, the cryptic error message appears to be suggesting a necessary parameter for the SST or gamma-theta model is not defined somewhere.

cfdgremlin · November 26, 2015, 07:52

Which version of CFX are you using?

How did you include the transition model - by editing the CCL or by setting it up in CFX-Pre?

November 24, 2015, 15:06	Gamma Theta Model Error	#1
dl467 New Member Join Date: Nov 2015 Posts: 4 Rep Power: 10	Hi, I am attempting to capture the transition around a Low Pressure Turbine using the SST Gamma Theta Model. SST on its own works fine, but once I add in the Gamma Theta Model I get an error: Error detected by routine PSHDIR CDRNAM=/FLOW/PHYSICS/ZN1/FL1/TURBM/TRANSITION/RETRNONS/TFC/SIGMA CRESLT = NONE Could you please help me understand what might have gone wrong?

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November 24, 2015, 18:30		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	There is probably a necessary parameter you have not defined. Maybe you have not defined the Gamma-theta conditions at a boundary condition? Or an initial condition?

November 24, 2015, 19:57		#3
dl467 New Member Join Date: Nov 2015 Posts: 4 Rep Power: 10	My understanding is after reading the CFX-Modelling Guide, that I don't need to define anything extra at the boundary or an initial condition.

November 24, 2015, 20:04		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	You appear to be correct. Regardless, the cryptic error message appears to be suggesting a necessary parameter for the SST or gamma-theta model is not defined somewhere.

November 26, 2015, 07:52		#5
cfdgremlin Member Join Date: Dec 2009 Posts: 44 Rep Power: 16	Which version of CFX are you using? How did you include the transition model - by editing the CCL or by setting it up in CFX-Pre?