Propeller simulation

leon_jar · August 18, 2014, 06:41

HI,
I'm looking for help regarding simulation of a propeller. I simulate only 1 blade air propeller (periodicity used). Model settings: Steady state, one rotating damain. I use SST fully turbulent model. Domain is rotating 4800 rev/min. I used Alternate Rotating Model. Velocity inlet :200m/s (stationary frame) farfield and outlet set as an opening (stationary frame) with Entrainment option. For both BCs static pressure value is set as relative pressure: 76000 Pa. Blade and hub walls are: no slip wall and adiabatic. The problem is that calculation is running only with Isothermal Heat Transfer option. When I try to change it to the Total Energy option, simulation gets divergent. I tried to start the simulation with energy on from RPM=0 and successively increase RMP till 2000 rev/m and it works but when I increase angular velocity more, ~3000 it gets divergent. The same situation when I restart the calculation from simulation without Heat transfer. After ~ 100 iteration it gets divergent. Does anyone could help me with this issue?

ghorrocks · August 18, 2014, 18:32

The tips on this FAQ would be relevant here: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F

I would be suspicious that some form of compressible flow thing is happening. Could shock waves be forming? I would put the residuals in the results file and save a series of results files as you approach the point where it crashes. Then have a look at the region of poor residuals and that might give you a clue as to what is going on.

August 18, 2014, 06:41	Propeller simulation	#1
leon_jar New Member Join Date: Jun 2014 Posts: 10 Rep Power: 11	HI, I'm looking for help regarding simulation of a propeller. I simulate only 1 blade air propeller (periodicity used). Model settings: Steady state, one rotating damain. I use SST fully turbulent model. Domain is rotating 4800 rev/min. I used Alternate Rotating Model. Velocity inlet :200m/s (stationary frame) farfield and outlet set as an opening (stationary frame) with Entrainment option. For both BCs static pressure value is set as relative pressure: 76000 Pa. Blade and hub walls are: no slip wall and adiabatic. The problem is that calculation is running only with Isothermal Heat Transfer option. When I try to change it to the Total Energy option, simulation gets divergent. I tried to start the simulation with energy on from RPM=0 and successively increase RMP till 2000 rev/m and it works but when I increase angular velocity more, ~3000 it gets divergent. The same situation when I restart the calculation from simulation without Heat transfer. After ~ 100 iteration it gets divergent. Does anyone could help me with this issue?

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August 18, 2014, 18:32		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The tips on this FAQ would be relevant here: http://www.cfd-online.com/Wiki/Ansys...do_about_it.3F I would be suspicious that some form of compressible flow thing is happening. Could shock waves be forming? I would put the residuals in the results file and save a series of results files as you approach the point where it crashes. Then have a look at the region of poor residuals and that might give you a clue as to what is going on.