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-   -   Interface model for a radial inflow turbine (http://www.cfd-online.com/Forums/cfx/113864-interface-model-radial-inflow-turbine.html)

kelinjose February 28, 2013 05:23

Interface model for a radial inflow turbine
 
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

http://dl.dropbox.com/u/11526528/cfx.png

ghorrocks February 28, 2013 06:41

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 14:00

what boundary conditions and cell zone conditions r u using?


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