# Using sliding mesh for unsteady turbomachinery problem

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 June 17, 2011, 07:43 Using sliding mesh for unsteady turbomachinery problem #1 New Member   Join Date: May 2011 Posts: 4 Rep Power: 6 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.

 June 20, 2011, 10:00 #2 Member   A. S. Join Date: Apr 2009 Location: Raipur (INDIA) Posts: 38 Rep Power: 8 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

 June 23, 2011, 06:53 #3 New Member   Join Date: May 2011 Posts: 4 Rep Power: 6 Anyone else have any suggestions?

 July 8, 2011, 14:29 #4 Member   Join Date: Jul 2011 Location: US Posts: 39 Rep Power: 6 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. __________________ CFD engineering resource

 Tags sliding mesh, turbomachinery, unsteady flow

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