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-   -   Using sliding mesh for unsteady turbomachinery problem (http://www.cfd-online.com/Forums/main/89605-using-sliding-mesh-unsteady-turbomachinery-problem.html)

happyman June 17, 2011 07:43

Using sliding mesh for unsteady turbomachinery problem
 
Hi all,

I am currently modeling a turbine using periodic functions so my domain is one stator/rotor/stator arrangement. Having used mixing planes for steady calculations i now am running unsteady calculations and from what i have researched i need to apply a mixing plane for this. My problem is the periodicity of each zone must be the same, however i have 26 stators (on each set upstream and downstream of rotor) and 30 rotor blades so it is not. I do not have the computational power to model the full wheel so need to scale the stator zones somehow. Do i just scale dimensions in the radial plane and leave height as is or how do i do it? Do i need to scale inputs or results from the zone? Or is there an easier way? Previously i have modeled unsteady flow on this problem using mixing plane but it only works uni-directionally and not bi-directionally (as is the nature of this flow).

Thanks in advance for any help.

apoorv June 20, 2011 10:00

May be I can help; also you could be help for me, drop a mail shukla_apoorv1975@yahoo.co.uk or alternately we can have a chat on gtalk

happyman June 23, 2011 06:53

Anyone else have any suggestions?

Docfreezzzz July 8, 2011 14:29

If you have the capability for a half rotor simulation you can do a 15 rotors/13 stators passage simulation. You could also add a stator blade and do a third passage simulation of 10 rotors/9 stators. This shouldn't increase the stator section solidity by very much and is a very common strategy for running turbomachinery applications. In my experience, the mass flow through the machine is affected very little by adding an additional stator blade to find a common denominator in blade counts. Typically on the order of 1% or so.


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