Hi every body
I designed a turbine in Gambit and meshed in that. Turbine have 6 blades.Due to the circumferential symmetry, only one sixth of the annulus has been computed, imposing periodic boundary conditions in the tangential direction. working fluid is air and this turbine is named Wells turbine.
According to the first link , the computational domain has been restricted in the axial direction to six chord lengths upstream and ten chord lengths downstream of the blade.
Now, I want to use Moving Reference Frame (MRF) method.
Here, I have a question:
How to use MRF? Should I separate a region in this designed model for using MRF?
Turbine is as show in the second and third links.
According to above explanations, should I separate expressed region as shown in the fourth link?
But according to forth link, the casing is very close to tip of blade and It is hard for separating above region. I separated many volumes around the blade for meshing this model. Top and down of tip are separated different volumes as shown the fifth link.
I am grateful that guide me and If it is possible, please place useful links about this case.
Thanks,
Best,
Ali
http://kanakh.com/upload/uploads/14292137881.jpg
http://0up.ir/do.php?imgf=Tip.png
http://www.upload7.ir/imgs/2014-10/37346220310608280524.jpg
http://0up.ir/do.php?imgf=maxd_cd61b.png
http://0up.ir/do.php?imgf=max223.jpg
Hi Bernhard Semlitsch
I studied the FLUENT manual.
when the problem involves stationary components (w.r.t fixed frame) which cannot be described by surface of revolution, the Multiple Reference Frame (MRF) model can be used. This needs separating / dividing the domain into multiple fluid zones i.e, rotating and stationary, with an interface separating them.
But in my case, the walls of the stationary parts (Casing) can be described by surface of revolution. So, the problem can be solved using Single Rotating Reference Frame (SRF) model and there is no need for separating the region or interface.
But here, I have a question:
According the following figure, Should blade be stationary in my case? or moving wall?
I am grateful that guide me about this problem.
Really thanks,
Best,
Ali
http://0up.ir/do.php?imgf=Cap555ture.jpg
Hi
I would recommend you to watch this series of youtube videos, you will find answers to all your questions.
https://www.youtube.com/watch?v=paSsU19hNy0
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