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boudary conditions for flow past a sphere

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Old   January 25, 2001, 07:02
Default boudary conditions for flow past a sphere
  #1
srijit goswami
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1)what are the boudary conditions for the flow of a viscous fluid past a sphere ?
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Old   January 26, 2001, 10:22
Default Re: boudary conditions for flow past a sphere
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al-otaiby
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1. slip condition all over the surface, if it not

rotate must be applied..

2. pressure on the surface can be simply extrapolated

to ensure dp/pn=0
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Old   January 26, 2001, 10:33
Default Re: boudary conditions for flow past a sphere
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Sebastien Perron
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-I agree that for projection scheme of the simple family the BC for pressure is dp/dn=0.

-But for other projection schemes that use incomplete splitting the BC must be of the form

d(delta p)/dn=(1/dt)vn where vn is the "starred" velocity normal to the boundary thas has to be changed, i.e:

v(t=t^n+1)=vn-dt*d(delta p)/dn

-My point is that you BC depends on the scheme you use.

If you could give us more info, our answer would be more adequate.
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Old   January 27, 2001, 08:28
Default Re: boudary conditions for flow past a sphere
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Senthil
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For god's sake don't put some vague querry.Give more info about the scheme
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