Impeller Design

swapna kondaveeti · February 10, 2016, 15:25

Hello all,

I'm working on a mixed flow impeller. I used bladegen for blade profile and then used CFX turbo mode. Following conditions were used
1. Inlet BC : Pressure at 1 atm
2. Outlet BC : Mass flow rate - known
3. Using counter rotating walls for blade,hub and shroud resulted in errors. for what should I counter rotating wall ?

ghorrocks · February 10, 2016, 17:16

Counter rotating walls are walls in a rotating reference frame which rotate against the rotating frame to end up being stationary in the stationary frame of reference.

So for bits of your model which rotate (eg blades) you do not want these counter rotating. Just leave these as stationary walls (relative to the rotating frame of reference).

swapna kondaveeti · February 11, 2016, 11:22

Thank you Glenn

I continued the simulations using blade,hub and shroud as no slip walls. I got a total efficiency in to out as 78.685 %. Now I wanna add a stator/diffuser to it. Is it possible to add both impeller and diffuser in ansys itself without building a CAD model in solidworks or Creo ?

turbo · February 11, 2016, 14:44

WB > BladeGen > TG > CFX > Import both meshes

February 10, 2016, 15:25	Impeller Design	#1
swapna kondaveeti New Member swapna Join Date: Feb 2016 Posts: 4 Rep Power: 10	Hello all, I'm working on a mixed flow impeller. I used bladegen for blade profile and then used CFX turbo mode. Following conditions were used 1. Inlet BC : Pressure at 1 atm 2. Outlet BC : Mass flow rate - known 3. Using counter rotating walls for blade,hub and shroud resulted in errors. for what should I counter rotating wall ?

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February 10, 2016, 17:16		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Counter rotating walls are walls in a rotating reference frame which rotate against the rotating frame to end up being stationary in the stationary frame of reference. So for bits of your model which rotate (eg blades) you do not want these counter rotating. Just leave these as stationary walls (relative to the rotating frame of reference).

February 11, 2016, 11:22		#3
swapna kondaveeti New Member swapna Join Date: Feb 2016 Posts: 4 Rep Power: 10	Thank you Glenn I continued the simulations using blade,hub and shroud as no slip walls. I got a total efficiency in to out as 78.685 %. Now I wanna add a stator/diffuser to it. Is it possible to add both impeller and diffuser in ansys itself without building a CAD model in solidworks or Creo ?

February 11, 2016, 14:44		#4
turbo Senior Member Join Date: Jun 2009 Posts: 174 Rep Power: 16	WB > BladeGen > TG > CFX > Import both meshes