Interface model for a radial inflow turbine

kelinjose · February 28, 2013, 04:23

Hi,

I am trying to simulate a turboexpander with radial inflow and axial outflow.
It consists of three parts basically
1. Nozzle : Stationary part, radial flow of fluid
2. Blade : Rotating with high rpm, radial inflow, axial outflow
3. Diffuser : Stationary, along the axis of rotation as shown in the figure.

I created all the blades as single blade was not giving me proper results
I am using 3 interfaces
1. Rotational periodic betwen the blades Per1 - Per2
2. Frozen rotor, for both the other interfaces.

Am I using the correct interface model? Which is the best turbulence model to be used in this.
Thanks a lot for helping

Please see the link for the system
http://dl.dropbox.com/u/11526528/cfx.png

ghorrocks · February 28, 2013, 05:41

Have a look at the rotating machinery tutorials and documentation about the differences between the different approaches.

The choice of what turbulence model depends on what you are tryign to model as well. In general SST is a good choice, but some applications require RSM, LES, DES or laminar models.

hitesh5190 · February 28, 2013, 13:00

what boundary conditions and cell zone conditions r u using?

February 28, 2013, 04:23	Interface model for a radial inflow turbine	#1
kelinjose New Member KJ Join Date: Dec 2012 Posts: 1 Rep Power: 0	Hi, I am trying to simulate a turboexpander with radial inflow and axial outflow. It consists of three parts basically 1. Nozzle : Stationary part, radial flow of fluid 2. Blade : Rotating with high rpm, radial inflow, axial outflow 3. Diffuser : Stationary, along the axis of rotation as shown in the figure. I created all the blades as single blade was not giving me proper results I am using 3 interfaces 1. Rotational periodic betwen the blades Per1 - Per2 2. Frozen rotor, for both the other interfaces. Am I using the correct interface model? Which is the best turbulence model to be used in this. Thanks a lot for helping Please see the link for the system http://dl.dropbox.com/u/11526528/cfx.png

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February 28, 2013, 05:41		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,690 Rep Power: 143	Have a look at the rotating machinery tutorials and documentation about the differences between the different approaches. The choice of what turbulence model depends on what you are tryign to model as well. In general SST is a good choice, but some applications require RSM, LES, DES or laminar models.

February 28, 2013, 13:00		#3
hitesh5190 New Member hitesh Join Date: Feb 2013 Posts: 1 Rep Power: 0	what boundary conditions and cell zone conditions r u using?