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farhoud_uk47 October 2, 2013 15:07

range of Y+ for numerical simulation
 
hi
i want to simulate a propeller of immerse body in 3D state.(SST of turbulent model)
I have a question, at this case , what is range of Y+ in near wall
thanks for your guidance..... :p

ghorrocks October 2, 2013 18:09

Why do you want to simulate a propeller with immersed solids? Rotating frames of reference will be more accurate and easier.

What y+ to aim for? There is no general answer to that. Do a sensitivity study on mesh density and find out for your application what mesh resolution you require. Some simulations require more than others.

farhoud_uk47 October 3, 2013 07:30

response of range of y+
 
Quote:

Originally Posted by ghorrocks (Post 454774)
Why do you want to simulate a propeller with immersed solids? Rotating frames of reference will be more accurate and easier.

What y+ to aim for? There is no general answer to that. Do a sensitivity study on mesh density and find out for your application what mesh resolution you require. Some simulations require more than others.

Hi, at first, thank you for your note
I did this mesh method ( two domain with rotating frame)
but i want to understand range of wall function in near of wall propeller that accuracy of results is appropriate and accurate.

ghorrocks October 3, 2013 08:24

My second comment in the previous post addresses your question.

Also read the meshing comments in the CFX documentation, they have some useful things to say.

farhoud_uk47 October 3, 2013 09:59

Quote:

Originally Posted by ghorrocks (Post 454866)
My second comment in the previous post addresses your question.

Also read the meshing comments in the CFX documentation, they have some useful things to say.

thanks but your second comment isn't that place.

singer1812 October 3, 2013 10:10

Another thing you should ask yourself is: does asking about what y+ to use with an immersed solid even make sense?

There really isnt a "Wall Boundary" when you use an immersed solid. It is faked in.


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