range of Y+ for numerical simulation

farhoud_uk47 · October 2, 2013, 15:07

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.....

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

Quote:

Originally Posted by ghorrocks

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

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.

October 2, 2013, 15:07	range of Y+ for numerical simulation	#1
farhoud_uk47 New Member MSc Join Date: Aug 2012 Posts: 5 Rep Power: 13	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.....

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October 2, 2013, 18:09		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	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.

October 3, 2013, 08:24		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	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.

October 3, 2013, 10:10		#6
singer1812 Senior Member Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 511 Rep Power: 20	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.