Propeller simulation

leon_jar · August 18, 2014, 07:41

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, 19:32

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, 07:41	Propeller simulation	#1
leon_jar New Member Join Date: Jun 2014 Posts: 10 Rep Power: 13	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?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Propeller calculation	toil	CFX	19	July 2, 2025 07:04
Quadrotor helicopter propeller simulation	Attesz	CFX	14	December 4, 2017 16:45
AMI - Propeller Tutorial diverging	kingmaker	OpenFOAM Running, Solving & CFD	2	November 4, 2016 03:57
Convergence of jet flow simulation	MiraLisa	FLUENT	0	August 15, 2013 05:44
Propeller Simulation	Craig Paxton	FLUENT	11	February 17, 2010 00:57

August 18, 2014, 19:32		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 18,011 Rep Power: 146	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.