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

MangoNrFive · February 14, 2018, 14:31

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

AtoHM · February 15, 2018, 03:32

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.

MangoNrFive · February 15, 2018, 12:27

Thank you, exactly what i needed!

February 14, 2018, 14:31	Interpolating Segment-Result on Full-Cylinder-Model as initial Condition	#1
MangoNrFive Member Philipp Wiedemer Join Date: Dec 2016 Location: Munich, Germany Posts: 42 Rep Power: 9	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

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February 15, 2018, 03:32		#2
AtoHM Senior Member M Join Date: Dec 2017 Posts: 700 Rep Power: 12	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, 12:27		#3
MangoNrFive Member Philipp Wiedemer Join Date: Dec 2016 Location: Munich, Germany Posts: 42 Rep Power: 9	Thank you, exactly what i needed!