Low Reynolds Number Flow Computation
Hi,
What are the difficulties in the computation of low Reynolds number viscous flow? Thank you in advance. 
Re: Low Reynolds Number Flow Computation
Low Reynolds number viscous flow  no problem! It's very simple!

Re: Low Reynolds Number Flow Computation
It depends on Mach number. If M is not small (for example > 1) this problem is not "very simple!"
Alexey 
Re: Low Reynolds Number Flow Computation
If Mach number too big > Reynolds number not small!

Re: Low Reynolds Number Flow Computation
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.

Re: Low Reynolds Number Flow Computation
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 
Re: Low Reynolds Number Flow Computation
plz send me books on this topic and on cfd thanks
mukkarum new one in cfd 
Re: Low Reynolds Number Flow Computation
Situation when Re is small and M is big may take place when gas is strongly rarefied. In this case either NavierStokes or Boltzmann equations are used depending on Knudsen number.
=Alexey 
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