how can I increase Y-plus in 2D geometry

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 November 26, 2007, 15:46 how can I increase Y-plus in 2D geometry #1 rb Guest   Posts: n/a Hi I am simulating 2D geometry I saw my y+ value very law can anyone guide me how can i increase it? rb

 November 27, 2007, 05:42 Re: how can I increase Y-plus in 2D geometry #2 Kasper Guest   Posts: n/a Take a look at this to understand y+: http://www.cfd-online.com/Wiki/Dimen..._wall_distance Y+ is the non-dimensional wall distance. The formula y+ = u(star) * y / kin_visk, says it all for you. If you wan't to increase y+ value then make the center of you first cell further from the wall. Or change the kinematic viskosity. The value of y+ in the first cell should be controlled in regard to what you are modelling. Take a search on y+ in forum and you will find loads of information. BR Kasper

 November 27, 2007, 06:28 Re: how can I increase Y-plus in 2D geometry #3 rb Guest   Posts: n/a Hi thanks for the information you sent. I saw the formula for estimating the desire grid distance but it was mentioned for flow a flow over a flat plate? is it work for the case of pipe flow and how much the value of Ref. length in this case for y+=41 & diameter=77.92 mm? rb

 November 28, 2007, 03:55 Re: how can I increase Y-plus in 2D geometry #4 Kasper Guest   Posts: n/a I think the diameter could be the reference length, but I'm not sure. Use the grid spacing calculator: http://geolab.larc.nasa.gov/APPS/YPlus/#TOTAL and insert y+=41 ref.length=0.07792m and your Re no. But why are you using y+=41? BR Kaspeer

 November 30, 2007, 10:53 Re: how can I increase Y-plus in 2D geometry #5 rb Guest   Posts: n/a because I need to use the non-equilibrium wall function as wall treatment so I want set y+ over 30? Do you have another suggestions? rb

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