# Interpolating Segment-Result on Full-Cylinder-Model as initial Condition

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 February 14, 2018, 13:31 Interpolating Segment-Result on Full-Cylinder-Model as initial Condition #1 Member   Philipp Wiedemer Join Date: Dec 2016 Location: Munich, Germany Posts: 32 Rep Power: 5 Hello What? I would like to simulate the influence of a non-centric rotor-Position on a leaf-seal. My plan was to start with a small segment with periodic bc. After doing sensitivity studies etc. i would like to interpolate the results on the full 360°-model as initial condition. For this purpose i can interpolate onto a model with centric rotor first and move the rotor later. Why? The segment-simulation already takes relatively long to converge. Since the geometry is axialsymmetric i don't expect major periodic phenomena thus the rotational interpolation should be a very good initial condition. How? Is there any way of doing this? It should be a common idea to interpolate a periodic segment on a full model, but i couldn't find any solution. I use ICEM for meshing and CFX for the solver, pre- and postprocessing. Thanks for reading this

 February 15, 2018, 02:32 #2 Senior Member   M Join Date: Dec 2017 Posts: 276 Rep Power: 5 It is implemented in CFX. In Pre, go to Execution Control -> Initial Values. Add an Initial Values Item with your segment result. Then, add a Interpolation Mapping Item and tick replication control. Here you can give the rotation axis and set up your interpolation. In my case there is a turbine rotor with 1 blade per passage. There are 65 blade in total. I want 4 of those together, so I used the numbers like: Pass. in Component: 1; Passages in 360: 65; Total Num. Instances: 4; Theta Offset: 0. I hope this helps.

 February 15, 2018, 11:27 #3 Member   Philipp Wiedemer Join Date: Dec 2016 Location: Munich, Germany Posts: 32 Rep Power: 5 Thank you, exactly what i needed!

 Tags cfx, initial condition, interpolation, periodic bc