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Regarding Turbulence-Reynolds Number

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Old   April 28, 2005, 01:05
Default Regarding Turbulence-Reynolds Number
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when dealing with Engine Intake flows Why genenally people will prefer"K-E/High Re.number"option why not "K-E/Low"option. What will happen if we use "K-E/Low"option.

Kindly explain me

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Old   April 29, 2005, 23:22
Default Re: Regarding Turbulence-Reynolds Number
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for "K-E/Low Re no. u hav 2 use two layer model tht is not compatible to er case. Not in engine intake flows but most of cases use K-E/High Re.number.
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Old   May 1, 2005, 11:26
Default Re: Regarding Turbulence-Reynolds Number
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In my opinion is more to do with the grid !!! if you are using hi-Rey number then the fist cell at the wall should be placed at y+ around 30 to 100 if you use low-Re model then y+ need to be a unity at the wall Hi-Rey model use a wall function while Low-Rey doesn't. two-layer models are simplified version but still you need to refine the grid with these ones too for more info check the manual.
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Old   May 2, 2005, 00:01
Default Re: Regarding Turbulence-Reynolds Number
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Low-Re models will invoke more detail and accurate calculations near the wall at the expense of pre & processing time. However, the details obtained may not be relevant to engine intake case where pressure drag/loss is of interest and not skin friction. Maybe that's why more people use hi-Re for this flow case.
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