Cfx simulation of radial turbine stator

Pablotf12 · July 3, 2020, 14:35

Good afternoon guys.

I am trying to simulate a stator for an organic Rankine cycle radial turbine, First I created the geometry using Solidworks and export it to Ansys workbench, I mesh the domain, define boundaries and all required specifications. However, when I run the simulation, the Mach number has an order of magnitude of 10^2, which is odd as results obtained considering only one of the stator nozzles are right (Mach number at the outlet of about 2). The simulation is 2D and as inlet and outlet boundary conditions I set the total relative pressure and static relative pressure respectively

I have been thinking and must be related to the simulation setup.

Kind Regards.

Pablo

ghorrocks · July 4, 2020, 06:33

If the maximum Mach number increases to unrealistic values your simulation is starting to diverge. You don't have a floating point error yet, but you soon will. This FAQ might help: https://www.cfd-online.com/Wiki/Ansy...do_about_it.3F

Pablotf12 · July 13, 2020, 05:17

Quote:

Originally Posted by ghorrocks

If the maximum Mach number increases to unrealistic values your simulation is starting to diverge. You don't have a floating point error yet, but you soon will. This FAQ might help: https://www.cfd-online.com/Wiki/Ansy...do_about_it.3F

Thanks, I managed to find the solution to my problem, Kind Regards
Pablo

July 3, 2020, 14:35	Cfx simulation of radial turbine stator	#1
Pablotf12 New Member Pablo Tapia Join Date: Apr 2019 Posts: 7 Rep Power: 6	Good afternoon guys. I am trying to simulate a stator for an organic Rankine cycle radial turbine, First I created the geometry using Solidworks and export it to Ansys workbench, I mesh the domain, define boundaries and all required specifications. However, when I run the simulation, the Mach number has an order of magnitude of 10^2, which is odd as results obtained considering only one of the stator nozzles are right (Mach number at the outlet of about 2). The simulation is 2D and as inlet and outlet boundary conditions I set the total relative pressure and static relative pressure respectively I have been thinking and must be related to the simulation setup. Kind Regards. Pablo

July 4, 2020, 06:33		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	If the maximum Mach number increases to unrealistic values your simulation is starting to diverge. You don't have a floating point error yet, but you soon will. This FAQ might help: https://www.cfd-online.com/Wiki/Ansy...do_about_it.3F __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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