# no slip wall condition

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 February 1, 2017, 10:15 no slip wall condition #1 New Member   mohamad ali mirzaei Join Date: Feb 2017 Posts: 27 Rep Power: 8 I want to numerically simulate drilling mud(a power law fluid) flowing inside a well. for each node, I have 3 equations (continuity,z-comp motion, r-comp motion) which mean I also need 3 equations on boundaries. on wall boundary condition I know vr and vz must be set to zero but I do not know what is 3rd equation on the wall. can anybody help me? best regards

February 1, 2017, 11:40
#2
Senior Member

Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,259
Rep Power: 67
Quote:
 Originally Posted by mohamadalimirzaei1994 I want to numerically simulate drilling mud(a power law fluid) flowing inside a well. for each node, I have 3 equations (continuity,z-comp motion, r-comp motion) which mean I also need 3 equations on boundaries. on wall boundary condition I know vr and vz must be set to zero but I do not know what is 3rd equation on the wall. can anybody help me? best regards

the mass flux has zero normal component on a not-permeable wall, otherwise a permeable wall requires to know an additional condition on the flux

 February 1, 2017, 12:01 #3 New Member   mohamad ali mirzaei Join Date: Feb 2017 Posts: 27 Rep Power: 8 i set this condition(vr=0) and vz=0 I'm looking for 3rd condition on the wall

February 1, 2017, 12:01
#4
Senior Member

Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,259
Rep Power: 67
Quote:
 Originally Posted by mohamadalimirzaei1994 i set this condition(vr=0) and vz=0 I'm looking for 3rd condition on the wall

I do not understand, you need to prescribe the BC for each one of the 3 equations ....

 Tags boundaries condition, no-slip, wall