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Solver stalled with Spalart-Allmaras model

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Old   March 7, 2024, 09:47
Default Solver stalled with Spalart-Allmaras model
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I have a 1-stage compressor model consisting of a rotor and stator. I have already analyzed it with the SST turbulence model. The y+ for both domains is about ~1. I was trying to test the Spalart-Allmaras model which is still a beta feature in CFX. But when it started in the solver, the solver just stopped and did not move forward from "Initial Conditions Supplied by Fields in the Input Files". Even when I clicked the stop button to kill it, it did not respond.
I tested with default and scalable wall function, but nothing changed.

The version of Ansys is 2021 R2.

Below is where it stopped:

Code:
+--------------------------------------------------------------------+
 |      Initial Conditions Supplied by Fields in the Input Files      |
 +--------------------------------------------------------------------+
 Domain Name : Rotor
     Courant Number
     Density
     Density Derivative wrt Pressure at Constant Temperature
     Dynamic Viscosity
     Eddy Viscosity
     Isothermal Compressibility
     Pressure
     Rotational Energy
     Rothalpy
     Shock Indicator
     Specific Heat Capacity at Constant Pressure
     Static Enthalpy
     Static Entropy
     Temperature
     Thermal Conductivity
     Total Enthalpy
     Turbulence Kinetic Energy
     Velocity
     Wall Scale
 Domain Name : Stator
     Absolute Pressure
     Courant Number
     Density
     Density Derivative wrt Pressure at Constant Temperature
     Density.Beta
     Density.Gradient
     Dynamic Viscosity
     Eddy Viscosity
     Isothermal Compressibility
     Local Speed of Sound
     Mach Number
     Pressure
     Pressure.Beta
     Pressure.Gradient
     Real Partition Number
     Rotation Velocity
     Shear Strain Rate
     Shock Indicator
     Specific Heat Capacity at Constant Pressure
     Specific Heat Capacity at Constant Volume
     Specific Volume
     Static Enthalpy
     Static Entropy
     Temperature
     Thermal Conductivity
     Total Density
     Total Enthalpy
     Total Enthalpy.Gradient
     Total Pressure
     Total Temperature
     Turbulence Kinetic Energy
     Velocity
     Velocity.Beta
     Velocity.Curl
     Velocity.Gradient
     Vorticity
     Wall Distance
     Wall Scale
     Wall Scale.Gradient
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Old   March 7, 2024, 10:24
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If you are running in parallel, likely a defect where the simulation is "locked".

You can try running it in serial, and see if it passes that point. You decide how to run after that.
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Old   March 7, 2024, 10:31
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Quote:
Originally Posted by Opaque View Post
If you are running in parallel, likely a defect where the simulation is "locked".

You can try running it in serial, and see if it passes that point. You decide how to run after that.
Thank you Opaque. So it runs in serial mode. What was the issue here then? Should I use a serial mode to use SA mode? I have never seen this type of issue over the last 10 years with Ansys though.
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Old   March 7, 2024, 12:02
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Spalart-Allmaras has been beta for a while. Likely not fully tested for all configurations by Ansys 2021R2.

Do you have access to Ansys 2024R1, or 2023R2? Possible someone else already reported problem
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Old   March 7, 2024, 12:40
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Quote:
Originally Posted by Opaque View Post
Spalart-Allmaras has been beta for a while. Likely not fully tested for all configurations by Ansys 2021R2.

Do you have access to Ansys 2024R1, or 2023R2? Possible someone else already reported problem
I do have access to those versions of Ansys. So is it no longer a beta feature in the recent version? Looks like it was a beta until March 2023 according to this post: How to set boundary conditions for the Spalart-Allmaras-Model in CFX?

Update: I looked at the Ansys Help manual and it looks like it is a beta feature still in 2024 R1. There is no manual for the SA model in CFX.
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Old   March 7, 2024, 13:49
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I think you are correct, still beta, but I would try it out in case it is now working.
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