Target y+ for Euler mesh

tjim · December 10, 2018, 05:11

Hi all,

Sorry, this may be a really simple question; in SU2, is there a specific target y+ that one should aim for when meshing for the Euler solver?

Many thanks and kind regards,
Tim

aero_amit · December 10, 2018, 10:10

Wall y+ is a non-dimensional parameter.
It is an important parameter and used with turbulence models to calculate or check the first cell height for a given turbulence model/approach (wall function or solve to the wall).
For euler simulations you are only solving invicid flow and fine stretched grid to resolve boundary layer is not required. So you can simply have a mesh good enough to resolve flow features in the field like contact discontinuity or shock etc..

tjim · December 11, 2018, 00:12

Thanks for the reply. That makes sense - I haven't touched CFD in a while, so I could only recall needing different y+ values for different wall functions, which is only a concern in turbulence modelling and RANS! I guess all I need is sufficient mesh density to resolve my flow feature of interest then.

Kind regards,
Tim

December 10, 2018, 05:11	Target y+ for Euler mesh	#1
tjim New Member Tim Jim Join Date: Sep 2017 Posts: 25 Rep Power: 9	Hi all, Sorry, this may be a really simple question; in SU2, is there a specific target y+ that one should aim for when meshing for the Euler solver? Many thanks and kind regards, Tim

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December 10, 2018, 10:10		#2
aero_amit Member Amit Join Date: May 2013 Posts: 85 Rep Power: 13	Wall y+ is a non-dimensional parameter. It is an important parameter and used with turbulence models to calculate or check the first cell height for a given turbulence model/approach (wall function or solve to the wall). For euler simulations you are only solving invicid flow and fine stretched grid to resolve boundary layer is not required. So you can simply have a mesh good enough to resolve flow features in the field like contact discontinuity or shock etc..

December 11, 2018, 00:12		#3
tjim New Member Tim Jim Join Date: Sep 2017 Posts: 25 Rep Power: 9	Thanks for the reply. That makes sense - I haven't touched CFD in a while, so I could only recall needing different y+ values for different wall functions, which is only a concern in turbulence modelling and RANS! I guess all I need is sufficient mesh density to resolve my flow feature of interest then. Kind regards, Tim