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Low Reynolds Number Flow Computation

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Old   January 22, 2002, 04:42
Default Low Reynolds Number Flow Computation
  #1
A.M.Yang
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Hi,

What are the difficulties in the computation of low Reynolds number viscous flow?

Thank you in advance.
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Old   January 22, 2002, 05:13
Default Re: Low Reynolds Number Flow Computation
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Andrey
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Low Reynolds number viscous flow - no problem! It's very simple!
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Old   January 22, 2002, 05:42
Default Re: Low Reynolds Number Flow Computation
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Alexey
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It depends on Mach number. If M is not small (for example > 1) this problem is not "very simple!"

Alexey
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Old   January 22, 2002, 07:35
Default Re: Low Reynolds Number Flow Computation
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Andrey
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If Mach number too big -> Reynolds number not small!
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Old   January 22, 2002, 09:55
Default Re: Low Reynolds Number Flow Computation
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Farshid
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If the scale of your simulation is of the order of hundreds of micro meters or less, you might have some problems with boundary conditions. For instance, no slip b.c.'s may not be valid. Especially, this problem arises when Mach number is large.
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Old   January 22, 2002, 10:28
Default Re: Low Reynolds Number Flow Computation
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Christian Holm
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Does that not depent on weather the assumption of the fluid being a continuum holds ? ie. if we have a thin low pressure gas and small dimensions, then the eq. we normally use are not valid.

Christian
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Old   January 22, 2002, 12:16
Default Re: Low Reynolds Number Flow Computation
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mukkarum hussain
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plz send me books on this topic and on cfd thanks

mukkarum

new one in cfd
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Old   January 22, 2002, 13:01
Default Re: Low Reynolds Number Flow Computation
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Alexey
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Situation when Re is small and M is big may take place when gas is strongly rarefied. In this case either Navier-Stokes or Boltzmann equations are used depending on Knudsen number.

=Alexey

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